Merge configure.ac from gcc project

To merge with gcc's copy of configure.ac we need to revert changes to
configure.ac in the following gcc commits:
dc832fb39fc0 2022-08-25
fc259b522c0f 2022-06-25
Then reapply configure.ac changes in binutils from these binutils
commits:
50ad1254d503 2021-01-09
bb368aad297f 2022-03-11
e5f2f7d901ee 2022-07-26
2cac01e3ffff 2022-09-26
Plus copy over gcc's config/ax_cxx_compile_stdcxx.m4, then regenerate
configure.

diff --git a/config/ax_cxx_compile_stdcxx.m4 b/config/ax_cxx_compile_stdcxx.m4
new file mode 100644 (file)
index 0000000..8c55ebd
--- /dev/null
+++ b/config/ax_cxx_compile_stdcxx.m4
@@ -0,0 +1,979 @@
+# ===========================================================================
+#  https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional])
+#
+# DESCRIPTION
+#
+#   Check for baseline language coverage in the compiler for the specified
+#   version of the C++ standard.  If necessary, add switches to CXX and
+#   CXXCPP to enable support.  VERSION may be '11' (for the C++11 standard)
+#   or '14' (for the C++14 standard).
+#
+#   The second argument, if specified, indicates whether you insist on an
+#   extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
+#   -std=c++11).  If neither is specified, you get whatever works, with
+#   preference for no added switch, and then for an extended mode.
+#
+#   The third argument, if specified 'mandatory' or if left unspecified,
+#   indicates that baseline support for the specified C++ standard is
+#   required and that the macro should error out if no mode with that
+#   support is found.  If specified 'optional', then configuration proceeds
+#   regardless, after defining HAVE_CXX${VERSION} if and only if a
+#   supporting mode is found.
+#
+#   If the fourth argument is an optional CXX/CXXFLAG/CPPFLAG suffix, e.g.
+#   "_FOR_BUILD" or "_FOR_TARGET".
+#
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
+#   Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
+#   Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
+#   Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
+#   Copyright (c) 2015 Paul Norman <penorman@mac.com>
+#   Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
+#   Copyright (c) 2016, 2018 Krzesimir Nowak <qdlacz@gmail.com>
+#   Copyright (c) 2019 Enji Cooper <yaneurabeya@gmail.com>
+#   Copyright (c) 2020 Jason Merrill <jason@redhat.com>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved.  This file is offered as-is, without any
+#   warranty.
+
+#serial 12
+
+dnl  This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
+dnl  (serial version number 13).
+
+AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
+  m4_if([$1], [11], [ax_cxx_compile_alternatives="11 0x"],
+        [$1], [14], [ax_cxx_compile_alternatives="14 1y"],
+        [$1], [17], [ax_cxx_compile_alternatives="17 1z"],
+        [m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
+  m4_if([$2], [], [],
+        [$2], [ext], [],
+        [$2], [noext], [],
+        [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl
+  m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true],
+        [$3], [mandatory], [ax_cxx_compile_cxx$1_required=true],
+        [$3], [optional], [ax_cxx_compile_cxx$1_required=false],
+        [m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])])
+  AC_LANG_PUSH([C++])dnl
+  ac_success=no
+  m4_ifnblank([$4], [dnl
+    ax_cv_cxx_compile_cxx$1_orig_cxx="$CXX"
+    ax_cv_cxx_compile_cxx$1_orig_cxxflags="$CXXFLAGS"
+    ax_cv_cxx_compile_cxx$1_orig_cppflags="$CPPFLAGS"
+    CXX="$CXX$4"
+    CXXFLAGS="$CXXFLAGS$4"
+    CPPFLAGS="$CPPFLAGS$4"])
+  m4_if([$2], [], [dnl
+    AC_CACHE_CHECK(whether $CXX supports C++$1 features by default,
+                  ax_cv_cxx_compile_cxx$1$4,
+      [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+        [ax_cv_cxx_compile_cxx$1$4=yes],
+        [ax_cv_cxx_compile_cxx$1$4=no])])
+    if test x$ax_cv_cxx_compile_cxx$1$4 = xyes; then
+      ac_success=yes
+    fi])
+
+  m4_if([$2], [noext], [], [dnl
+  if test x$ac_success = xno; then
+    for alternative in ${ax_cxx_compile_alternatives}; do
+      switch="-std=gnu++${alternative}"
+      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1$4_$switch])
+      AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+                     $cachevar,
+        [ac_save_CXX="$CXX"
+         CXX="$CXX $switch"
+         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+          [eval $cachevar=yes],
+          [eval $cachevar=no])
+         CXX="$ac_save_CXX"])
+      if eval test x\$$cachevar = xyes; then
+        CXX="$CXX $switch"
+        if test -n "$CXXCPP" ; then
+          CXXCPP="$CXXCPP $switch"
+        fi
+        ac_success=yes
+        break
+      fi
+    done
+  fi])
+
+  m4_if([$2], [ext], [], [dnl
+  if test x$ac_success = xno; then
+    dnl HP's aCC needs +std=c++11 according to:
+    dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
+    dnl Cray's crayCC needs "-h std=c++11"
+    for alternative in ${ax_cxx_compile_alternatives}; do
+      for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do
+        cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1$4_$switch])
+        AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+                       $cachevar,
+          [ac_save_CXX="$CXX"
+           CXX="$CXX $switch"
+           AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+            [eval $cachevar=yes],
+            [eval $cachevar=no])
+           CXX="$ac_save_CXX"])
+        if eval test x\$$cachevar = xyes; then
+          CXX="$CXX $switch"
+          if test -n "$CXXCPP" ; then
+            CXXCPP="$CXXCPP $switch"
+          fi
+          ac_success=yes
+          break
+        fi
+      done
+      if test x$ac_success = xyes; then
+        break
+      fi
+    done
+  fi])
+  m4_ifnblank([$4], [dnl
+    CXX$4="$CXX"
+    CXXFLAGS$4="$CXXFLAGS"
+    CPPFLAGS$4="$CPPFLAGS"
+    CXX="$ax_cv_cxx_compile_cxx$1_orig_cxx"
+    CXXFLAGS="$ax_cv_cxx_compile_cxx$1_orig_cxxflags"
+    CPPFLAGS="$ax_cv_cxx_compile_cxx$1_orig_cppflags"])
+  AC_LANG_POP([C++])
+  if test x$ax_cxx_compile_cxx$1_required = xtrue; then
+    if test x$ac_success = xno; then
+      AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
+    fi
+  fi
+  if test x$ac_success = xno; then
+    HAVE_CXX$1$4=0
+    AC_MSG_NOTICE([No compiler with C++$1 support was found])
+  else
+    HAVE_CXX$1$4=1
+    AC_DEFINE(HAVE_CXX$1$4,1,
+              [define if the compiler supports basic C++$1 syntax])
+  fi
+  AC_SUBST(HAVE_CXX$1$4)
+])
+
+
+dnl  Test body for checking C++11 support
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11],
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+)
+
+
+dnl  Test body for checking C++14 support
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_14
+)
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17],
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_14
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_17
+)
+
+dnl  Tests for new features in C++11
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
+
+// If the compiler admits that it is not ready for C++11, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201103L
+
+#error "This is not a C++11 compiler"
+
+#else
+
+namespace cxx11
+{
+
+  namespace test_static_assert
+  {
+
+    template <typename T>
+    struct check
+    {
+      static_assert(sizeof(int) <= sizeof(T), "not big enough");
+    };
+
+  }
+
+  namespace test_final_override
+  {
+
+    struct Base
+    {
+      virtual ~Base() {}
+      virtual void f() {}
+    };
+
+    struct Derived : public Base
+    {
+      virtual ~Derived() override {}
+      virtual void f() override {}
+    };
+
+  }
+
+  namespace test_double_right_angle_brackets
+  {
+
+    template < typename T >
+    struct check {};
+
+    typedef check<void> single_type;
+    typedef check<check<void>> double_type;
+    typedef check<check<check<void>>> triple_type;
+    typedef check<check<check<check<void>>>> quadruple_type;
+
+  }
+
+  namespace test_decltype
+  {
+
+    int
+    f()
+    {
+      int a = 1;
+      decltype(a) b = 2;
+      return a + b;
+    }
+
+  }
+
+  namespace test_type_deduction
+  {
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static const bool value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static const bool value = true;
+    };
+
+    template < typename T1, typename T2 >
+    auto
+    add(T1 a1, T2 a2) -> decltype(a1 + a2)
+    {
+      return a1 + a2;
+    }
+
+    int
+    test(const int c, volatile int v)
+    {
+      static_assert(is_same<int, decltype(0)>::value == true, "");
+      static_assert(is_same<int, decltype(c)>::value == false, "");
+      static_assert(is_same<int, decltype(v)>::value == false, "");
+      auto ac = c;
+      auto av = v;
+      auto sumi = ac + av + 'x';
+      auto sumf = ac + av + 1.0;
+      static_assert(is_same<int, decltype(ac)>::value == true, "");
+      static_assert(is_same<int, decltype(av)>::value == true, "");
+      static_assert(is_same<int, decltype(sumi)>::value == true, "");
+      static_assert(is_same<int, decltype(sumf)>::value == false, "");
+      static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
+      return (sumf > 0.0) ? sumi : add(c, v);
+    }
+
+  }
+
+  namespace test_noexcept
+  {
+
+    int f() { return 0; }
+    int g() noexcept { return 0; }
+
+    static_assert(noexcept(f()) == false, "");
+    static_assert(noexcept(g()) == true, "");
+
+  }
+
+  namespace test_constexpr
+  {
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
+    {
+      return *s ? strlen_c_r(s + 1, acc + 1) : acc;
+    }
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c(const CharT *const s) noexcept
+    {
+      return strlen_c_r(s, 0UL);
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("1") == 1UL, "");
+    static_assert(strlen_c("example") == 7UL, "");
+    static_assert(strlen_c("another\0example") == 7UL, "");
+
+  }
+
+  namespace test_rvalue_references
+  {
+
+    template < int N >
+    struct answer
+    {
+      static constexpr int value = N;
+    };
+
+    answer<1> f(int&)       { return answer<1>(); }
+    answer<2> f(const int&) { return answer<2>(); }
+    answer<3> f(int&&)      { return answer<3>(); }
+
+    void
+    test()
+    {
+      int i = 0;
+      const int c = 0;
+      static_assert(decltype(f(i))::value == 1, "");
+      static_assert(decltype(f(c))::value == 2, "");
+      static_assert(decltype(f(0))::value == 3, "");
+    }
+
+  }
+
+  namespace test_uniform_initialization
+  {
+
+    struct test
+    {
+      static const int zero {};
+      static const int one {1};
+    };
+
+    static_assert(test::zero == 0, "");
+    static_assert(test::one == 1, "");
+
+  }
+
+  namespace test_lambdas
+  {
+
+    void
+    test1()
+    {
+      auto lambda1 = [](){};
+      auto lambda2 = lambda1;
+      lambda1();
+      lambda2();
+    }
+
+    int
+    test2()
+    {
+      auto a = [](int i, int j){ return i + j; }(1, 2);
+      auto b = []() -> int { return '0'; }();
+      auto c = [=](){ return a + b; }();
+      auto d = [&](){ return c; }();
+      auto e = [a, &b](int x) mutable {
+        const auto identity = [](int y){ return y; };
+        for (auto i = 0; i < a; ++i)
+          a += b--;
+        return x + identity(a + b);
+      }(0);
+      return a + b + c + d + e;
+    }
+
+    int
+    test3()
+    {
+      const auto nullary = [](){ return 0; };
+      const auto unary = [](int x){ return x; };
+      using nullary_t = decltype(nullary);
+      using unary_t = decltype(unary);
+      const auto higher1st = [](nullary_t f){ return f(); };
+      const auto higher2nd = [unary](nullary_t f1){
+        return [unary, f1](unary_t f2){ return f2(unary(f1())); };
+      };
+      return higher1st(nullary) + higher2nd(nullary)(unary);
+    }
+
+  }
+
+  namespace test_variadic_templates
+  {
+
+    template <int...>
+    struct sum;
+
+    template <int N0, int... N1toN>
+    struct sum<N0, N1toN...>
+    {
+      static constexpr auto value = N0 + sum<N1toN...>::value;
+    };
+
+    template <>
+    struct sum<>
+    {
+      static constexpr auto value = 0;
+    };
+
+    static_assert(sum<>::value == 0, "");
+    static_assert(sum<1>::value == 1, "");
+    static_assert(sum<23>::value == 23, "");
+    static_assert(sum<1, 2>::value == 3, "");
+    static_assert(sum<5, 5, 11>::value == 21, "");
+    static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
+
+  }
+
+  // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+  // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
+  // because of this.
+  namespace test_template_alias_sfinae
+  {
+
+    struct foo {};
+
+    template<typename T>
+    using member = typename T::member_type;
+
+    template<typename T>
+    void func(...) {}
+
+    template<typename T>
+    void func(member<T>*) {}
+
+    void test();
+
+    void test() { func<foo>(0); }
+
+  }
+
+}  // namespace cxx11
+
+#endif  // __cplusplus >= 201103L
+
+]])
+
+
+dnl  Tests for new features in C++14
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
+
+// If the compiler admits that it is not ready for C++14, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201402L
+
+#error "This is not a C++14 compiler"
+
+#else
+
+namespace cxx14
+{
+
+  namespace test_polymorphic_lambdas
+  {
+
+    int
+    test()
+    {
+      const auto lambda = [](auto&&... args){
+        const auto istiny = [](auto x){
+          return (sizeof(x) == 1UL) ? 1 : 0;
+        };
+        const int aretiny[] = { istiny(args)... };
+        return aretiny[0];
+      };
+      return lambda(1, 1L, 1.0f, '1');
+    }
+
+  }
+
+  namespace test_binary_literals
+  {
+
+    constexpr auto ivii = 0b0000000000101010;
+    static_assert(ivii == 42, "wrong value");
+
+  }
+
+  namespace test_generalized_constexpr
+  {
+
+    template < typename CharT >
+    constexpr unsigned long
+    strlen_c(const CharT *const s) noexcept
+    {
+      auto length = 0UL;
+      for (auto p = s; *p; ++p)
+        ++length;
+      return length;
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("x") == 1UL, "");
+    static_assert(strlen_c("test") == 4UL, "");
+    static_assert(strlen_c("another\0test") == 7UL, "");
+
+  }
+
+  namespace test_lambda_init_capture
+  {
+
+    int
+    test()
+    {
+      auto x = 0;
+      const auto lambda1 = [a = x](int b){ return a + b; };
+      const auto lambda2 = [a = lambda1(x)](){ return a; };
+      return lambda2();
+    }
+
+  }
+
+  namespace test_digit_separators
+  {
+
+    constexpr auto ten_million = 100'000'000;
+    static_assert(ten_million == 100000000, "");
+
+  }
+
+  namespace test_return_type_deduction
+  {
+
+    auto f(int& x) { return x; }
+    decltype(auto) g(int& x) { return x; }
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static constexpr auto value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static constexpr auto value = true;
+    };
+
+    int
+    test()
+    {
+      auto x = 0;
+      static_assert(is_same<int, decltype(f(x))>::value, "");
+      static_assert(is_same<int&, decltype(g(x))>::value, "");
+      return x;
+    }
+
+  }
+
+}  // namespace cxx14
+
+#endif  // __cplusplus >= 201402L
+
+]])
+
+
+dnl  Tests for new features in C++17
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_17], [[
+
+// If the compiler admits that it is not ready for C++17, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201703L
+
+#error "This is not a C++17 compiler"
+
+#else
+
+#include <initializer_list>
+#include <utility>
+#include <type_traits>
+
+namespace cxx17
+{
+
+  namespace test_constexpr_lambdas
+  {
+
+    constexpr int foo = [](){return 42;}();
+
+  }
+
+  namespace test::nested_namespace::definitions
+  {
+
+  }
+
+  namespace test_fold_expression
+  {
+
+    template<typename... Args>
+    int multiply(Args... args)
+    {
+      return (args * ... * 1);
+    }
+
+    template<typename... Args>
+    bool all(Args... args)
+    {
+      return (args && ...);
+    }
+
+  }
+
+  namespace test_extended_static_assert
+  {
+
+    static_assert (true);
+
+  }
+
+  namespace test_auto_brace_init_list
+  {
+
+    auto foo = {5};
+    auto bar {5};
+
+    static_assert(std::is_same<std::initializer_list<int>, decltype(foo)>::value);
+    static_assert(std::is_same<int, decltype(bar)>::value);
+  }
+
+  namespace test_typename_in_template_template_parameter
+  {
+
+    template<template<typename> typename X> struct D;
+
+  }
+
+  namespace test_fallthrough_nodiscard_maybe_unused_attributes
+  {
+
+    int f1()
+    {
+      return 42;
+    }
+
+    [[nodiscard]] int f2()
+    {
+      [[maybe_unused]] auto unused = f1();
+
+      switch (f1())
+      {
+      case 17:
+        f1();
+        [[fallthrough]];
+      case 42:
+        f1();
+      }
+      return f1();
+    }
+
+  }
+
+  namespace test_extended_aggregate_initialization
+  {
+
+    struct base1
+    {
+      int b1, b2 = 42;
+    };
+
+    struct base2
+    {
+      base2() {
+        b3 = 42;
+      }
+      int b3;
+    };
+
+    struct derived : base1, base2
+    {
+        int d;
+    };
+
+    derived d1 {{1, 2}, {}, 4};  // full initialization
+    derived d2 {{}, {}, 4};      // value-initialized bases
+
+  }
+
+  namespace test_general_range_based_for_loop
+  {
+
+    struct iter
+    {
+      int i;
+
+      int& operator* ()
+      {
+        return i;
+      }
+
+      const int& operator* () const
+      {
+        return i;
+      }
+
+      iter& operator++()
+      {
+        ++i;
+        return *this;
+      }
+    };
+
+    struct sentinel
+    {
+      int i;
+    };
+
+    bool operator== (const iter& i, const sentinel& s)
+    {
+      return i.i == s.i;
+    }
+
+    bool operator!= (const iter& i, const sentinel& s)
+    {
+      return !(i == s);
+    }
+
+    struct range
+    {
+      iter begin() const
+      {
+        return {0};
+      }
+
+      sentinel end() const
+      {
+        return {5};
+      }
+    };
+
+    void f()
+    {
+      range r {};
+
+      for (auto i : r)
+      {
+        [[maybe_unused]] auto v = i;
+      }
+    }
+
+  }
+
+  namespace test_lambda_capture_asterisk_this_by_value
+  {
+
+    struct t
+    {
+      int i;
+      int foo()
+      {
+        return [*this]()
+        {
+          return i;
+        }();
+      }
+    };
+
+  }
+
+  namespace test_enum_class_construction
+  {
+
+    enum class byte : unsigned char
+    {};
+
+    byte foo {42};
+
+  }
+
+  namespace test_constexpr_if
+  {
+
+    template <bool cond>
+    int f ()
+    {
+      if constexpr(cond)
+      {
+        return 13;
+      }
+      else
+      {
+        return 42;
+      }
+    }
+
+  }
+
+  namespace test_selection_statement_with_initializer
+  {
+
+    int f()
+    {
+      return 13;
+    }
+
+    int f2()
+    {
+      if (auto i = f(); i > 0)
+      {
+        return 3;
+      }
+
+      switch (auto i = f(); i + 4)
+      {
+      case 17:
+        return 2;
+
+      default:
+        return 1;
+      }
+    }
+
+  }
+
+  namespace test_template_argument_deduction_for_class_templates
+  {
+
+    template <typename T1, typename T2>
+    struct pair
+    {
+      pair (T1 p1, T2 p2)
+        : m1 {p1},
+          m2 {p2}
+      {}
+
+      T1 m1;
+      T2 m2;
+    };
+
+    void f()
+    {
+      [[maybe_unused]] auto p = pair{13, 42u};
+    }
+
+  }
+
+  namespace test_non_type_auto_template_parameters
+  {
+
+    template <auto n>
+    struct B
+    {};
+
+    B<5> b1;
+    B<'a'> b2;
+
+  }
+
+  namespace test_structured_bindings
+  {
+
+    int arr[2] = { 1, 2 };
+    std::pair<int, int> pr = { 1, 2 };
+
+    auto f1() -> int(&)[2]
+    {
+      return arr;
+    }
+
+    auto f2() -> std::pair<int, int>&
+    {
+      return pr;
+    }
+
+    struct S
+    {
+      int x1 : 2;
+      volatile double y1;
+    };
+
+    S f3()
+    {
+      return {};
+    }
+
+    auto [ x1, y1 ] = f1();
+    auto& [ xr1, yr1 ] = f1();
+    auto [ x2, y2 ] = f2();
+    auto& [ xr2, yr2 ] = f2();
+    const auto [ x3, y3 ] = f3();
+
+  }
+
+  namespace test_exception_spec_type_system
+  {
+
+    struct Good {};
+    struct Bad {};
+
+    void g1() noexcept;
+    void g2();
+
+    template<typename T>
+    Bad
+    f(T*, T*);
+
+    template<typename T1, typename T2>
+    Good
+    f(T1*, T2*);
+
+    static_assert (std::is_same_v<Good, decltype(f(g1, g2))>);
+
+  }
+
+  namespace test_inline_variables
+  {
+
+    template<class T> void f(T)
+    {}
+
+    template<class T> inline T g(T)
+    {
+      return T{};
+    }
+
+    template<> inline void f<>(int)
+    {}
+
+    template<> int g<>(int)
+    {
+      return 5;
+    }
+
+  }
+
+}  // namespace cxx17
+
+#endif  // __cplusplus < 201703L
+
+]])

diff --git a/configure b/configure
index f14e0efd675eaff3ac292ef6997ebdb9f616bb65..4d530e6d21d8bb06499f54f839f1e64aaff16384 100755 (executable)
--- a/configure
+++ b/configure
@@ -603,14 +603,17 @@ WINDRES_FOR_TARGET
 STRIP_FOR_TARGET
 READELF_FOR_TARGET
 RANLIB_FOR_TARGET
+OTOOL_FOR_TARGET
 OBJDUMP_FOR_TARGET
 OBJCOPY_FOR_TARGET
 NM_FOR_TARGET
 LIPO_FOR_TARGET
 LD_FOR_TARGET
+DSYMUTIL_FOR_TARGET
 DLLTOOL_FOR_TARGET
 AS_FOR_TARGET
 AR_FOR_TARGET
+GDC_FOR_TARGET
 GOC_FOR_TARGET
 GFORTRAN_FOR_TARGET
 GCC_FOR_TARGET
@@ -618,8 +621,10 @@ CXX_FOR_TARGET
 CC_FOR_TARGET
 RANLIB_PLUGIN_OPTION
 AR_PLUGIN_OPTION
-PKG_CONFIG_PATH
+GDCFLAGS
+GDC
 READELF
+OTOOL
 OBJDUMP
 OBJCOPY
 WINDMC
@@ -629,6 +634,7 @@ RANLIB
 NM
 LIPO
 LD
+DSYMUTIL
 DLLTOOL
 AS
 AR
@@ -646,12 +652,15 @@ RANLIB_FOR_BUILD
 NM_FOR_BUILD
 LD_FOR_BUILD
 LDFLAGS_FOR_BUILD
+GDC_FOR_BUILD
 GOC_FOR_BUILD
 GFORTRAN_FOR_BUILD
+DSYMUTIL_FOR_BUILD
 DLLTOOL_FOR_BUILD
 CXX_FOR_BUILD
 CXXFLAGS_FOR_BUILD
 CPPFLAGS_FOR_BUILD
+CPP_FOR_BUILD
 CFLAGS_FOR_BUILD
 CC_FOR_BUILD
 AS_FOR_BUILD
@@ -697,6 +706,8 @@ gmplibs
 PGO_BUILD_LTO_CFLAGS
 PGO_BUILD_USE_CFLAGS
 PGO_BUILD_GEN_CFLAGS
+HAVE_CXX11_FOR_BUILD
+HAVE_CXX11
 do_compare
 GNATMAKE
 GNATBIND
@@ -788,6 +799,7 @@ with_system_zlib
 with_zstd
 enable_as_accelerator_for
 enable_offload_targets
+enable_offload_defaulted
 enable_gold
 enable_ld
 enable_gprofng
@@ -804,11 +816,9 @@ enable_pgo_build
 with_mpc
 with_mpc_include
 with_mpc_lib
-with_mpfr_dir
 with_mpfr
 with_mpfr_include
 with_mpfr_lib
-with_gmp_dir
 with_gmp
 with_gmp_include
 with_gmp_lib
@@ -858,6 +868,7 @@ target_configargs
 AR
 AS
 DLLTOOL
+DSYMUTIL
 LD
 LIPO
 NM
@@ -867,20 +878,24 @@ WINDRES
 WINDMC
 OBJCOPY
 OBJDUMP
+OTOOL
 READELF
 CC_FOR_TARGET
 CXX_FOR_TARGET
 GCC_FOR_TARGET
 GFORTRAN_FOR_TARGET
 GOC_FOR_TARGET
+GDC_FOR_TARGET
 AR_FOR_TARGET
 AS_FOR_TARGET
 DLLTOOL_FOR_TARGET
+DSYMUTIL_FOR_TARGET
 LD_FOR_TARGET
 LIPO_FOR_TARGET
 NM_FOR_TARGET
 OBJCOPY_FOR_TARGET
 OBJDUMP_FOR_TARGET
+OTOOL_FOR_TARGET
 RANLIB_FOR_TARGET
 READELF_FOR_TARGET
 STRIP_FOR_TARGET
@@ -1517,6 +1532,11 @@ Optional Features:
                           enable offloading to devices from comma-separated
                           LIST of TARGET[=DIR]. Use optional path to find
                           offload target compiler during the build
+  --enable-offload-defaulted
+               If enabled, configured but not installed offload compilers and
+               libgomp plugins are silently ignored.  Useful for distribution
+               compilers where those are in separate optional packages.
+
   --enable-gold[=ARG]     build gold [ARG={default,yes,no}]
   --enable-ld[=ARG]       build ld [ARG={default,yes,no}]
   --enable-gprofng[=ARG]  build gprofng [ARG={yes,no}]
@@ -1575,14 +1595,12 @@ Optional Packages:
                           --with-mpc-lib=PATH/lib
   --with-mpc-include=PATH specify directory for installed MPC include files
   --with-mpc-lib=PATH     specify directory for the installed MPC library
-  --with-mpfr-dir=PATH    this option has been REMOVED
   --with-mpfr=PATH        specify prefix directory for installed MPFR package.
                           Equivalent to --with-mpfr-include=PATH/include plus
                           --with-mpfr-lib=PATH/lib
   --with-mpfr-include=PATH
                           specify directory for installed MPFR include files
   --with-mpfr-lib=PATH    specify directory for the installed MPFR library
-  --with-gmp-dir=PATH     this option has been REMOVED
   --with-gmp=PATH         specify prefix directory for the installed GMP
                           package. Equivalent to
                           --with-gmp-include=PATH/include plus
@@ -1644,6 +1662,7 @@ Some influential environment variables:
   AR          AR for the host
   AS          AS for the host
   DLLTOOL     DLLTOOL for the host
+  DSYMUTIL    DSYMUTIL for the host
   LD          LD for the host
   LIPO        LIPO for the host
   NM          NM for the host
@@ -1653,6 +1672,7 @@ Some influential environment variables:
   WINDMC      WINDMC for the host
   OBJCOPY     OBJCOPY for the host
   OBJDUMP     OBJDUMP for the host
+  OTOOL       OTOOL for the host
   READELF     READELF for the host
   CC_FOR_TARGET
               CC for the target
@@ -1664,12 +1684,16 @@ Some influential environment variables:
               GFORTRAN for the target
   GOC_FOR_TARGET
               GOC for the target
+  GDC_FOR_TARGET
+              GDC for the target
   AR_FOR_TARGET
               AR for the target
   AS_FOR_TARGET
               AS for the target
   DLLTOOL_FOR_TARGET
               DLLTOOL for the target
+  DSYMUTIL_FOR_TARGET
+              DSYMUTIL for the target
   LD_FOR_TARGET
               LD for the target
   LIPO_FOR_TARGET
@@ -1680,6 +1704,8 @@ Some influential environment variables:
               OBJCOPY for the target
   OBJDUMP_FOR_TARGET
               OBJDUMP for the target
+  OTOOL_FOR_TARGET
+              OTOOL for the target
   RANLIB_FOR_TARGET
               RANLIB for the target
   READELF_FOR_TARGET
@@ -2790,7 +2816,7 @@ build_tools="build-texinfo build-flex build-bison build-m4 build-fixincludes"
 
 # these libraries are used by various programs built for the host environment
 #f
-host_libs="intl libiberty opcodes bfd readline tcl tk itcl libgui zlib libbacktrace libcpp libdecnumber gmp mpfr mpc isl libelf libiconv libctf"
+host_libs="intl libiberty opcodes bfd readline tcl tk itcl libgui zlib libbacktrace libcpp libcody libdecnumber gmp mpfr mpc isl libiconv libctf"
 
 # these tools are built for the host environment
 # Note, the powerpc-eabi build depends on sim occurring before gdb in order to
@@ -2798,7 +2824,7 @@ host_libs="intl libiberty opcodes bfd readline tcl tk itcl libgui zlib libbacktr
 # binutils, gas and ld appear in that order because it makes sense to run
 # "make check" in that particular order.
 # If --enable-gold is used, "gold" may replace "ld".
-host_tools="texinfo flex bison binutils gas ld fixincludes gcc cgen sid sim gdb gdbserver gprof etc expect dejagnu m4 utils guile fastjar gnattools libcc1 gotools"
+host_tools="texinfo flex bison binutils gas ld fixincludes gcc cgen sid sim gdb gdbserver gprof etc expect dejagnu m4 utils guile fastjar gnattools libcc1 gotools c++tools"
 
 # these libraries are built for the target environment, and are built after
 # the host libraries and the host tools (which may be a cross compiler)
@@ -2809,7 +2835,6 @@ target_libraries="target-libgcc \
                target-newlib \
                target-libgomp \
                target-liboffloadmic \
-               target-libhsail-rt \
                target-libatomic \
                target-libitm \
                target-libstdc++-v3 \
@@ -2821,7 +2846,9 @@ target_libraries="target-libgcc \
                target-libffi \
                target-libobjc \
                target-libada \
-               target-libgo"
+               target-libgo \
+               target-libphobos \
+               target-zlib"
 
 # these tools are built using the target libraries, and are intended to
 # run only in the target environment
@@ -2935,12 +2962,6 @@ if test "${with_zstd+set}" = set; then :
 fi
 
 
-# Don't compile the bundled readline/libreadline.a if --with-system-readline
-# is provided.
-if test x$with_system_readline = xyes ; then
-  noconfigdirs="$noconfigdirs readline"
-fi
-
 # some tools are so dependent upon X11 that if we're not building with X,
 # it's not even worth trying to configure, much less build, that tool.
 
@@ -2995,6 +3016,14 @@ else
 fi
 
 
+# Check whether --enable-offload-defaulted was given.
+if test "${enable_offload_defaulted+set}" = set; then :
+  enableval=$enable_offload_defaulted; enable_offload_defaulted=$enableval
+else
+  enable_offload_defaulted=
+fi
+
+
 # Handle --enable-gold, --enable-ld.
 # --disable-gold [--enable-ld]
 #     Build only ld.  Default option.
@@ -3029,7 +3058,7 @@ case "${ENABLE_GOLD}" in
       *-*-elf* | *-*-sysv4* | *-*-unixware* | *-*-eabi* | hppa*64*-*-hpux* \
       | *-*-linux* | *-*-gnu* | frv-*-uclinux* | *-*-irix5* | *-*-irix6* \
       | *-*-netbsd* | *-*-openbsd* | *-*-freebsd* | *-*-dragonfly* \
-      | *-*-solaris2* | *-*-nto* | *-*-nacl* | *-*-haiku*)
+      | *-*-solaris2* | *-*-nto* | *-*-nacl*)
         case "${target}" in
           *-*-linux*aout* | *-*-linux*oldld*)
             ;;
@@ -3043,7 +3072,7 @@ case "${ENABLE_GOLD}" in
       # Check for target supported by gold.
       case "${target}" in
         i?86-*-* | x86_64-*-* | sparc*-*-* | powerpc*-*-* | arm*-*-* \
-        | aarch64*-*-* | tilegx*-*-* | mips*-*-* | s390*-*-*)
+        | aarch64*-*-* | tilegx*-*-* | mips*-*-* | s390*-*-* | loongarch*-*-*)
          configdirs="$configdirs gold"
          if test x${ENABLE_GOLD} = xdefault; then
            default_ld=gold
@@ -3259,7 +3288,7 @@ if test x$enable_libgomp = x ; then
        ;;
     *-*-darwin* | *-*-aix*)
        ;;
-    nvptx*-*-*)
+    nvptx*-*-* | amdgcn*-*-*)
        ;;
     *)
        noconfigdirs="$noconfigdirs target-libgomp"
@@ -3362,29 +3391,6 @@ $as_echo "yes" >&6; }
     fi
 fi
 
-
-# Disable libhsail-rt on unsupported systems.
-if test -d ${srcdir}/libhsail-rt; then
-    if test x$enable_libhsail_rt = x; then
-        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for libhsail-rt support" >&5
-$as_echo_n "checking for libhsail-rt support... " >&6; }
-        if (srcdir=${srcdir}/libhsail-rt; \
-                . ${srcdir}/configure.tgt; \
-                test -n "$UNSUPPORTED")
-        then
-            { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-            unsupported_languages="$unsupported_languages brig"
-            # This implicitly disables also target-libhsail-rt as it won't
-            # get added to the build without BRIG FE.
-        else
-            { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-        fi
-    fi
-fi
-
-
 # Disable libquadmath for some systems.
 case "${target}" in
   avr-*-*)
@@ -3403,9 +3409,16 @@ case "${target}" in
     # No hosted I/O support.
     noconfigdirs="$noconfigdirs target-libssp"
     ;;
+  bpf-*-*)
+    noconfigdirs="$noconfigdirs target-libssp"
+    ;;
   powerpc-*-aix* | rs6000-*-aix*)
     noconfigdirs="$noconfigdirs target-libssp"
     ;;
+  pru-*-*)
+    # No hosted I/O support.
+    noconfigdirs="$noconfigdirs target-libssp"
+    ;;
   rl78-*-*)
     # libssp uses a misaligned load to trigger a fault, but the RL78
     # doesn't fault for those - instead, it gives a build-time error
@@ -3419,13 +3432,17 @@ case "${target}" in
 esac
 
 # Disable libstdc++-v3 for some systems.
-# Allow user to override this if they pass --enable-libstdc++-v3
+# Allow user to override this if they pass --enable-libstdcxx
 if test "${ENABLE_LIBSTDCXX}" = "default" ; then
   case "${target}" in
     *-*-vxworks*)
       # VxWorks uses the Dinkumware C++ library.
       noconfigdirs="$noconfigdirs target-libstdc++-v3"
       ;;
+    amdgcn*-*-*)
+      # Not ported/fails to build when using newlib.
+      noconfigdirs="$noconfigdirs target-libstdc++-v3"
+      ;;
     arm*-wince-pe*)
       # the C++ libraries don't build on top of CE's C libraries
       noconfigdirs="$noconfigdirs target-libstdc++-v3"
@@ -3433,18 +3450,86 @@ if test "${ENABLE_LIBSTDCXX}" = "default" ; then
     avr-*-*)
       noconfigdirs="$noconfigdirs target-libstdc++-v3"
       ;;
+    bpf-*-*)
+      noconfigdirs="$noconfigdirs target-libstdc++-v3"
+      ;;
     ft32-*-*)
       noconfigdirs="$noconfigdirs target-libstdc++-v3"
       ;;
   esac
 fi
 
+# Disable C++ on systems where it is known to not work.
+# For testing, you can override this with --enable-languages=c++.
+case ,${enable_languages}, in
+  *,c++,*)
+    ;;
+  *)
+      case "${target}" in
+        bpf-*-*)
+          unsupported_languages="$unsupported_languages c++"
+          ;;
+      esac
+      ;;
+esac
+
+# Disable Objc on systems where it is known to not work.
+# For testing, you can override this with --enable-languages=objc.
+case ,${enable_languages}, in
+  *,objc,*)
+    ;;
+  *)
+      case "${target}" in
+        bpf-*-*)
+          unsupported_languages="$unsupported_languages objc"
+          ;;
+      esac
+      ;;
+esac
+
+# Disable D on systems where it is known to not work.
+# For testing, you can override this with --enable-languages=d.
+case ,${enable_languages}, in
+  *,d,*)
+    ;;
+  *)
+    case "${target}" in
+      bpf-*-*)
+       unsupported_languages="$unsupported_languages d"
+       ;;
+    esac
+    ;;
+esac
+
+# Disable libphobos on unsupported systems.
+# For testing, you can override this with --enable-libphobos.
+if test -d ${srcdir}/libphobos; then
+    if test x$enable_libphobos = x; then
+       { $as_echo "$as_me:${as_lineno-$LINENO}: checking for libphobos support" >&5
+$as_echo_n "checking for libphobos support... " >&6; }
+       if (srcdir=${srcdir}/libphobos; \
+               . ${srcdir}/configure.tgt; \
+               test "$LIBPHOBOS_SUPPORTED" != "yes")
+       then
+           { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+           noconfigdirs="$noconfigdirs target-libphobos"
+       else
+           { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+       fi
+    fi
+fi
+
 # Disable Fortran for some systems.
 case "${target}" in
   mmix-*-*)
     # See <http://gcc.gnu.org/ml/gcc-patches/2004-11/msg00572.html>.
     unsupported_languages="$unsupported_languages fortran"
     ;;
+  bpf-*-*)
+    unsupported_languages="$unsupported_languages fortran"
+    ;;
 esac
 
 # Disable libffi for some systems.
@@ -3488,6 +3573,12 @@ case "${target}" in
   arm-wince-pe)
     noconfigdirs="$noconfigdirs target-libffi"
     ;;
+  arm*-*-symbianelf*)
+    noconfigdirs="$noconfigdirs target-libffi"
+    ;;
+  bpf-*-*)
+    noconfigdirs="$noconfigdirs target-libffi"
+    ;;
   cris-*-* | crisv32-*-*)
     case "${target}" in
       *-*-linux*)
@@ -3534,7 +3625,7 @@ esac
 # Disable the go frontend on systems where it is known to not work. Please keep
 # this in sync with contrib/config-list.mk.
 case "${target}" in
-*-*-darwin* | *-*-cygwin* | *-*-mingw*)
+*-*-darwin* | *-*-cygwin* | *-*-mingw* | bpf-* )
     unsupported_languages="$unsupported_languages go"
     ;;
 esac
@@ -3569,6 +3660,9 @@ if test x$enable_libgo = x; then
     *-*-cygwin* | *-*-mingw*)
        noconfigdirs="$noconfigdirs target-libgo"
        ;;
+    bpf-*-*)
+        noconfigdirs="$noconfigdirs target-libgo"
+        ;;
     esac
 fi
 
@@ -3594,6 +3688,9 @@ case "${target}" in
   i[3456789]86-*-*)
     libgloss_dir=i386
     ;;
+  loongarch*-*-*)
+    libgloss_dir=loongarch
+    ;;
   m68hc11-*-*|m6811-*-*|m68hc12-*-*|m6812-*-*)
     libgloss_dir=m68hc11
     ;;
@@ -3606,6 +3703,9 @@ case "${target}" in
   powerpc*-*-*)
     libgloss_dir=rs6000
     ;;
+  pru-*-*)
+    libgloss_dir=pru
+    ;;
   sparc*-*-*)
     libgloss_dir=sparc
     ;;
@@ -3637,6 +3737,9 @@ case "${target}" in
   sparc-*-sunos4*)
     noconfigdirs="$noconfigdirs target-newlib target-libgloss"
     ;;
+  bpf-*-*)
+    noconfigdirs="$noconfigdirs target-newlib target-libgloss"
+    ;;
   *-*-aix*)
     noconfigdirs="$noconfigdirs target-newlib target-libgloss"
     ;;
@@ -3685,6 +3788,8 @@ case "${target}" in
     noconfigdirs="$noconfigdirs ld gas gdb gprof"
     noconfigdirs="$noconfigdirs sim target-rda"
     ;;
+  amdgcn*-*-*)
+    ;;
   arm-*-darwin*)
     noconfigdirs="$noconfigdirs ld gas gdb gprof"
     noconfigdirs="$noconfigdirs sim target-rda"
@@ -3708,7 +3813,8 @@ case "${target}" in
   *-*-dragonfly*)
     ;;
   *-*-freebsd*)
-    if test "x$with_gmp" = x && test "x$with_gmp_dir" = x \
+    if test "x$with_gmp" = x \
+       && ! test -d ${srcdir}/gmp \
        && test -f /usr/local/include/gmp.h; then
       with_gmp=/usr/local
     fi
@@ -3748,6 +3854,9 @@ case "${target}" in
     # newlib is not 64 bit ready
     noconfigdirs="$noconfigdirs target-newlib target-libgloss"
     ;;
+  bpf-*-*)
+    noconfigdirs="$noconfigdirs target-libobjc target-libbacktrace"
+    ;;
   sh*-*-pe|mips*-*-pe|*arm-wince-pe)
     noconfigdirs="$noconfigdirs tcl tk itcl libgui sim"
     ;;
@@ -3966,6 +4075,11 @@ case "${target}" in
   wasm32-*-*)
     noconfigdirs="$noconfigdirs ld"
     ;;
+  loongarch*-*-linux*)
+    ;;
+  loongarch*-*-*)
+    noconfigdirs="$noconfigdirs gprof"
+    ;;
 esac
 
 # If we aren't building newlib, then don't build libgloss, since libgloss
@@ -4020,7 +4134,7 @@ fi
   hppa*-*)
     host_makefile_frag="config/mh-pa"
     ;;
-  *-*-darwin*)
+  i?86-*-darwin[89]* | i?86-*-darwin1[0-7]* | powerpc*-*-darwin*)
     host_makefile_frag="config/mh-darwin"
     ;;
   powerpc-*-aix*)
@@ -4036,9 +4150,12 @@ if test "${build}" != "${host}" ; then
   AR_FOR_BUILD=${AR_FOR_BUILD-ar}
   AS_FOR_BUILD=${AS_FOR_BUILD-as}
   CC_FOR_BUILD=${CC_FOR_BUILD-gcc}
+  CPP_FOR_BUILD="${CPP_FOR_BUILD-\$(CC_FOR_BUILD) -E}"
   CXX_FOR_BUILD=${CXX_FOR_BUILD-g++}
+  DSYMUTIL_FOR_BUILD=${DSYMUTIL_FOR_BUILD-dsymutil}
   GFORTRAN_FOR_BUILD=${GFORTRAN_FOR_BUILD-gfortran}
   GOC_FOR_BUILD=${GOC_FOR_BUILD-gccgo}
+  GDC_FOR_BUILD=${GDC_FOR_BUILD-gdc}
   DLLTOOL_FOR_BUILD=${DLLTOOL_FOR_BUILD-dlltool}
   LD_FOR_BUILD=${LD_FOR_BUILD-ld}
   NM_FOR_BUILD=${NM_FOR_BUILD-nm}
@@ -4050,8 +4167,10 @@ else
   AS_FOR_BUILD="\$(AS)"
   CC_FOR_BUILD="\$(CC)"
   CXX_FOR_BUILD="\$(CXX)"
+  DSYMUTIL_FOR_BUILD="\$(DSYMUTIL)"
   GFORTRAN_FOR_BUILD="\$(GFORTRAN)"
   GOC_FOR_BUILD="\$(GOC)"
+  GDC_FOR_BUILD="\$(GDC)"
   DLLTOOL_FOR_BUILD="\$(DLLTOOL)"
   LD_FOR_BUILD="\$(LD)"
   NM_FOR_BUILD="\$(NM)"
@@ -5564,6 +5683,7 @@ else
   have_gnat=no
 fi
 
+ACX_PROG_GDC
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking how to compare bootstrapped objects" >&5
 $as_echo_n "checking how to compare bootstrapped objects... " >&6; }
 if ${gcc_cv_prog_cmp_skip+:} false; then :
@@ -5642,188 +5762,2179 @@ $as_echo "$as_me: WARNING: trying to bootstrap a cross compiler" >&2;}
     ;;
 esac
 
-# When bootstrapping with GCC, build stage 1 in C++98 mode to ensure that a
-# C++98 compiler can still start the bootstrap.
+# When bootstrapping with GCC, build stage 1 in C++11 mode to ensure that a
+# C++11 compiler can still start the bootstrap.  Otherwise, if building GCC,
+# require C++11 (or higher).
 if test "$enable_bootstrap:$GXX" = "yes:yes"; then
-  CXX="$CXX -std=gnu++98"
-fi
+  CXX="$CXX -std=c++11"
+elif test "$have_compiler" = yes; then
+    ax_cxx_compile_alternatives="11 0x"    ax_cxx_compile_cxx11_required=true
+  ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+  ac_success=no
 
-# Check whether --enable-pgo-build was given.
-if test "${enable_pgo_build+set}" = set; then :
-  enableval=$enable_pgo_build; enable_pgo_build=$enableval
+      { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features by default" >&5
+$as_echo_n "checking whether $CXX supports C++11 features by default... " >&6; }
+if ${ax_cv_cxx_compile_cxx11+:} false; then :
+  $as_echo_n "(cached) " >&6
 else
-  enable_pgo_build=no
-fi
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
 
 
-# Issue errors and warnings for invalid/strange PGO build combinations.
-case "$have_compiler:$host:$target:$enable_pgo_build" in
-  *:*:*:no) ;;
+// If the compiler admits that it is not ready for C++11, why torture it?
+// Hopefully, this will speed up the test.
 
-  # Allow the PGO build only if we aren't building a compiler and
-  # we are in a native configuration.
-  no:$build:$build:yes | no:$build:$build:lto) ;;
+#ifndef __cplusplus
 
-  # Disallow the PGO bootstrap if we are building a compiler.
-  yes:*:*:yes | yes:*:*:lto)
-    as_fn_error $? "cannot perform the PGO bootstrap when building a compiler" "$LINENO" 5 ;;
+#error "This is not a C++ compiler"
 
-  *)
-    as_fn_error $? "invalid option for --enable-pgo-build" "$LINENO" 5
-    ;;
-esac
+#elif __cplusplus < 201103L
 
-if test "$enable_pgo_build" != "no"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -fprofile-generate" >&5
-$as_echo_n "checking whether the compiler supports -fprofile-generate... " >&6; }
-  old_CFLAGS="$CFLAGS"
-  PGO_BUILD_GEN_CFLAGS="-fprofile-generate"
-  CFLAGS="$CFLAGS $PGO_BUILD_CFLAGS"
+#error "This is not a C++11 compiler"
 
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-int foo;
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
+#else
 
-else
-  PGO_BUILD_GEN_CFLAGS=
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-  CFLAGS="$old_CFLAGS"
-  if test -n "$PGO_BUILD_GEN_CFLAGS"; then
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-    PGO_BUILD_USE_CFLAGS="-fprofile-use"
-  else
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-    as_fn_error $? "cannot perform the PGO build without -fprofile-generate" "$LINENO" 5
-  fi
+namespace cxx11
+{
 
-  if test "$enable_pgo_build" = "lto"; then
-    { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -flto=jobserver -ffat-lto-objects" >&5
-$as_echo_n "checking whether the compiler supports -flto=jobserver -ffat-lto-objects... " >&6; }
-    old_CFLAGS="$CFLAGS"
-    PGO_BUILD_LTO_CFLAGS="-flto=jobserver -ffat-lto-objects"
-    CFLAGS="$CFLAGS $PGO_BUILD_LTO_CFLAGS"
-    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-int foo;
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
+  namespace test_static_assert
+  {
 
-else
-  PGO_BUILD_LTO_CFLAGS=
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-    CFLAGS="$old_CFLAGS"
-    if test -n "$PGO_BUILD_LTO_CFLAGS"; then
-      { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-    else
-      { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-      { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: LTO is disabled for the PGO build" >&5
-$as_echo "$as_me: WARNING: LTO is disabled for the PGO build" >&2;}
-    fi
-  fi
-fi
+    template <typename T>
+    struct check
+    {
+      static_assert(sizeof(int) <= sizeof(T), "not big enough");
+    };
 
+  }
 
+  namespace test_final_override
+  {
 
+    struct Base
+    {
+      virtual ~Base() {}
+      virtual void f() {}
+    };
 
-# Used for setting $lt_cv_objdir
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for objdir" >&5
-$as_echo_n "checking for objdir... " >&6; }
-if ${lt_cv_objdir+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  rm -f .libs 2>/dev/null
-mkdir .libs 2>/dev/null
-if test -d .libs; then
-  lt_cv_objdir=.libs
-else
-  # MS-DOS does not allow filenames that begin with a dot.
-  lt_cv_objdir=_libs
-fi
-rmdir .libs 2>/dev/null
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $lt_cv_objdir" >&5
-$as_echo "$lt_cv_objdir" >&6; }
-objdir=$lt_cv_objdir
+    struct Derived : public Base
+    {
+      virtual ~Derived() override {}
+      virtual void f() override {}
+    };
 
+  }
 
+  namespace test_double_right_angle_brackets
+  {
 
+    template < typename T >
+    struct check {};
 
+    typedef check<void> single_type;
+    typedef check<check<void>> double_type;
+    typedef check<check<check<void>>> triple_type;
+    typedef check<check<check<check<void>>>> quadruple_type;
 
-cat >>confdefs.h <<_ACEOF
-#define LT_OBJDIR "$lt_cv_objdir/"
-_ACEOF
+  }
 
+  namespace test_decltype
+  {
 
+    int
+    f()
+    {
+      int a = 1;
+      decltype(a) b = 2;
+      return a + b;
+    }
 
-# Check for GMP, MPFR and MPC
-gmplibs="-lmpc -lmpfr -lgmp"
-gmpinc=
-have_gmp=no
+  }
 
-# Specify a location for mpc
-# check for this first so it ends up on the link line before mpfr.
+  namespace test_type_deduction
+  {
 
-# Check whether --with-mpc was given.
-if test "${with_mpc+set}" = set; then :
-  withval=$with_mpc;
-fi
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static const bool value = false;
+    };
 
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static const bool value = true;
+    };
 
-# Check whether --with-mpc-include was given.
-if test "${with_mpc_include+set}" = set; then :
-  withval=$with_mpc_include;
-fi
+    template < typename T1, typename T2 >
+    auto
+    add(T1 a1, T2 a2) -> decltype(a1 + a2)
+    {
+      return a1 + a2;
+    }
 
+    int
+    test(const int c, volatile int v)
+    {
+      static_assert(is_same<int, decltype(0)>::value == true, "");
+      static_assert(is_same<int, decltype(c)>::value == false, "");
+      static_assert(is_same<int, decltype(v)>::value == false, "");
+      auto ac = c;
+      auto av = v;
+      auto sumi = ac + av + 'x';
+      auto sumf = ac + av + 1.0;
+      static_assert(is_same<int, decltype(ac)>::value == true, "");
+      static_assert(is_same<int, decltype(av)>::value == true, "");
+      static_assert(is_same<int, decltype(sumi)>::value == true, "");
+      static_assert(is_same<int, decltype(sumf)>::value == false, "");
+      static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
+      return (sumf > 0.0) ? sumi : add(c, v);
+    }
 
-# Check whether --with-mpc-lib was given.
-if test "${with_mpc_lib+set}" = set; then :
-  withval=$with_mpc_lib;
-fi
+  }
 
+  namespace test_noexcept
+  {
 
-if test "x$with_mpc" != x; then
-  gmplibs="-L$with_mpc/lib $gmplibs"
-  gmpinc="-I$with_mpc/include $gmpinc"
-fi
-if test "x$with_mpc_include" != x; then
-  gmpinc="-I$with_mpc_include $gmpinc"
-fi
-if test "x$with_mpc_lib" != x; then
-  gmplibs="-L$with_mpc_lib $gmplibs"
-fi
-if test "x$with_mpc$with_mpc_include$with_mpc_lib" = x && test -d ${srcdir}/mpc; then
-  gmplibs='-L$$r/$(HOST_SUBDIR)/mpc/src/'"$lt_cv_objdir $gmplibs"
-  gmpinc='-I$$s/mpc/src '"$gmpinc"
-  # Do not test the mpc version.  Assume that it is sufficient, since
-  # it is in the source tree, and the library has not been built yet
-  # but it would be included on the link line in the version check below
-  # hence making the test fail.
-  have_gmp=yes
-fi
+    int f() { return 0; }
+    int g() noexcept { return 0; }
 
-# Specify a location for mpfr
-# check for this first so it ends up on the link line before gmp.
+    static_assert(noexcept(f()) == false, "");
+    static_assert(noexcept(g()) == true, "");
 
-# Check whether --with-mpfr-dir was given.
-if test "${with_mpfr_dir+set}" = set; then :
-  withval=$with_mpfr_dir; as_fn_error $? "The --with-mpfr-dir=PATH option has been removed.
-Use --with-mpfr=PATH or --with-mpfr-include=PATH plus --with-mpfr-lib=PATH" "$LINENO" 5
-fi
+  }
 
+  namespace test_constexpr
+  {
 
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
+    {
+      return *s ? strlen_c_r(s + 1, acc + 1) : acc;
+    }
 
-# Check whether --with-mpfr was given.
-if test "${with_mpfr+set}" = set; then :
-  withval=$with_mpfr;
-fi
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c(const CharT *const s) noexcept
+    {
+      return strlen_c_r(s, 0UL);
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("1") == 1UL, "");
+    static_assert(strlen_c("example") == 7UL, "");
+    static_assert(strlen_c("another\0example") == 7UL, "");
+
+  }
+
+  namespace test_rvalue_references
+  {
+
+    template < int N >
+    struct answer
+    {
+      static constexpr int value = N;
+    };
+
+    answer<1> f(int&)       { return answer<1>(); }
+    answer<2> f(const int&) { return answer<2>(); }
+    answer<3> f(int&&)      { return answer<3>(); }
+
+    void
+    test()
+    {
+      int i = 0;
+      const int c = 0;
+      static_assert(decltype(f(i))::value == 1, "");
+      static_assert(decltype(f(c))::value == 2, "");
+      static_assert(decltype(f(0))::value == 3, "");
+    }
+
+  }
+
+  namespace test_uniform_initialization
+  {
+
+    struct test
+    {
+      static const int zero {};
+      static const int one {1};
+    };
+
+    static_assert(test::zero == 0, "");
+    static_assert(test::one == 1, "");
+
+  }
+
+  namespace test_lambdas
+  {
+
+    void
+    test1()
+    {
+      auto lambda1 = [](){};
+      auto lambda2 = lambda1;
+      lambda1();
+      lambda2();
+    }
+
+    int
+    test2()
+    {
+      auto a = [](int i, int j){ return i + j; }(1, 2);
+      auto b = []() -> int { return '0'; }();
+      auto c = [=](){ return a + b; }();
+      auto d = [&](){ return c; }();
+      auto e = [a, &b](int x) mutable {
+        const auto identity = [](int y){ return y; };
+        for (auto i = 0; i < a; ++i)
+          a += b--;
+        return x + identity(a + b);
+      }(0);
+      return a + b + c + d + e;
+    }
+
+    int
+    test3()
+    {
+      const auto nullary = [](){ return 0; };
+      const auto unary = [](int x){ return x; };
+      using nullary_t = decltype(nullary);
+      using unary_t = decltype(unary);
+      const auto higher1st = [](nullary_t f){ return f(); };
+      const auto higher2nd = [unary](nullary_t f1){
+        return [unary, f1](unary_t f2){ return f2(unary(f1())); };
+      };
+      return higher1st(nullary) + higher2nd(nullary)(unary);
+    }
+
+  }
+
+  namespace test_variadic_templates
+  {
+
+    template <int...>
+    struct sum;
+
+    template <int N0, int... N1toN>
+    struct sum<N0, N1toN...>
+    {
+      static constexpr auto value = N0 + sum<N1toN...>::value;
+    };
+
+    template <>
+    struct sum<>
+    {
+      static constexpr auto value = 0;
+    };
+
+    static_assert(sum<>::value == 0, "");
+    static_assert(sum<1>::value == 1, "");
+    static_assert(sum<23>::value == 23, "");
+    static_assert(sum<1, 2>::value == 3, "");
+    static_assert(sum<5, 5, 11>::value == 21, "");
+    static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
+
+  }
+
+  // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+  // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
+  // because of this.
+  namespace test_template_alias_sfinae
+  {
+
+    struct foo {};
+
+    template<typename T>
+    using member = typename T::member_type;
+
+    template<typename T>
+    void func(...) {}
+
+    template<typename T>
+    void func(member<T>*) {}
+
+    void test();
+
+    void test() { func<foo>(0); }
+
+  }
+
+}  // namespace cxx11
+
+#endif  // __cplusplus >= 201103L
+
+
+
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  ax_cv_cxx_compile_cxx11=yes
+else
+  ax_cv_cxx_compile_cxx11=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_cxx_compile_cxx11" >&5
+$as_echo "$ax_cv_cxx_compile_cxx11" >&6; }
+    if test x$ax_cv_cxx_compile_cxx11 = xyes; then
+      ac_success=yes
+    fi
+
+    if test x$ac_success = xno; then
+    for alternative in ${ax_cxx_compile_alternatives}; do
+      switch="-std=gnu++${alternative}"
+      cachevar=`$as_echo "ax_cv_cxx_compile_cxx11_$switch" | $as_tr_sh`
+      { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features with $switch" >&5
+$as_echo_n "checking whether $CXX supports C++11 features with $switch... " >&6; }
+if eval \${$cachevar+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_save_CXX="$CXX"
+         CXX="$CXX $switch"
+         cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+
+// If the compiler admits that it is not ready for C++11, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201103L
+
+#error "This is not a C++11 compiler"
+
+#else
+
+namespace cxx11
+{
+
+  namespace test_static_assert
+  {
+
+    template <typename T>
+    struct check
+    {
+      static_assert(sizeof(int) <= sizeof(T), "not big enough");
+    };
+
+  }
+
+  namespace test_final_override
+  {
+
+    struct Base
+    {
+      virtual ~Base() {}
+      virtual void f() {}
+    };
+
+    struct Derived : public Base
+    {
+      virtual ~Derived() override {}
+      virtual void f() override {}
+    };
+
+  }
+
+  namespace test_double_right_angle_brackets
+  {
+
+    template < typename T >
+    struct check {};
+
+    typedef check<void> single_type;
+    typedef check<check<void>> double_type;
+    typedef check<check<check<void>>> triple_type;
+    typedef check<check<check<check<void>>>> quadruple_type;
+
+  }
+
+  namespace test_decltype
+  {
+
+    int
+    f()
+    {
+      int a = 1;
+      decltype(a) b = 2;
+      return a + b;
+    }
+
+  }
+
+  namespace test_type_deduction
+  {
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static const bool value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static const bool value = true;
+    };
+
+    template < typename T1, typename T2 >
+    auto
+    add(T1 a1, T2 a2) -> decltype(a1 + a2)
+    {
+      return a1 + a2;
+    }
+
+    int
+    test(const int c, volatile int v)
+    {
+      static_assert(is_same<int, decltype(0)>::value == true, "");
+      static_assert(is_same<int, decltype(c)>::value == false, "");
+      static_assert(is_same<int, decltype(v)>::value == false, "");
+      auto ac = c;
+      auto av = v;
+      auto sumi = ac + av + 'x';
+      auto sumf = ac + av + 1.0;
+      static_assert(is_same<int, decltype(ac)>::value == true, "");
+      static_assert(is_same<int, decltype(av)>::value == true, "");
+      static_assert(is_same<int, decltype(sumi)>::value == true, "");
+      static_assert(is_same<int, decltype(sumf)>::value == false, "");
+      static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
+      return (sumf > 0.0) ? sumi : add(c, v);
+    }
+
+  }
+
+  namespace test_noexcept
+  {
+
+    int f() { return 0; }
+    int g() noexcept { return 0; }
+
+    static_assert(noexcept(f()) == false, "");
+    static_assert(noexcept(g()) == true, "");
+
+  }
+
+  namespace test_constexpr
+  {
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
+    {
+      return *s ? strlen_c_r(s + 1, acc + 1) : acc;
+    }
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c(const CharT *const s) noexcept
+    {
+      return strlen_c_r(s, 0UL);
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("1") == 1UL, "");
+    static_assert(strlen_c("example") == 7UL, "");
+    static_assert(strlen_c("another\0example") == 7UL, "");
+
+  }
+
+  namespace test_rvalue_references
+  {
+
+    template < int N >
+    struct answer
+    {
+      static constexpr int value = N;
+    };
+
+    answer<1> f(int&)       { return answer<1>(); }
+    answer<2> f(const int&) { return answer<2>(); }
+    answer<3> f(int&&)      { return answer<3>(); }
+
+    void
+    test()
+    {
+      int i = 0;
+      const int c = 0;
+      static_assert(decltype(f(i))::value == 1, "");
+      static_assert(decltype(f(c))::value == 2, "");
+      static_assert(decltype(f(0))::value == 3, "");
+    }
+
+  }
+
+  namespace test_uniform_initialization
+  {
+
+    struct test
+    {
+      static const int zero {};
+      static const int one {1};
+    };
+
+    static_assert(test::zero == 0, "");
+    static_assert(test::one == 1, "");
+
+  }
+
+  namespace test_lambdas
+  {
+
+    void
+    test1()
+    {
+      auto lambda1 = [](){};
+      auto lambda2 = lambda1;
+      lambda1();
+      lambda2();
+    }
+
+    int
+    test2()
+    {
+      auto a = [](int i, int j){ return i + j; }(1, 2);
+      auto b = []() -> int { return '0'; }();
+      auto c = [=](){ return a + b; }();
+      auto d = [&](){ return c; }();
+      auto e = [a, &b](int x) mutable {
+        const auto identity = [](int y){ return y; };
+        for (auto i = 0; i < a; ++i)
+          a += b--;
+        return x + identity(a + b);
+      }(0);
+      return a + b + c + d + e;
+    }
+
+    int
+    test3()
+    {
+      const auto nullary = [](){ return 0; };
+      const auto unary = [](int x){ return x; };
+      using nullary_t = decltype(nullary);
+      using unary_t = decltype(unary);
+      const auto higher1st = [](nullary_t f){ return f(); };
+      const auto higher2nd = [unary](nullary_t f1){
+        return [unary, f1](unary_t f2){ return f2(unary(f1())); };
+      };
+      return higher1st(nullary) + higher2nd(nullary)(unary);
+    }
+
+  }
+
+  namespace test_variadic_templates
+  {
+
+    template <int...>
+    struct sum;
+
+    template <int N0, int... N1toN>
+    struct sum<N0, N1toN...>
+    {
+      static constexpr auto value = N0 + sum<N1toN...>::value;
+    };
+
+    template <>
+    struct sum<>
+    {
+      static constexpr auto value = 0;
+    };
+
+    static_assert(sum<>::value == 0, "");
+    static_assert(sum<1>::value == 1, "");
+    static_assert(sum<23>::value == 23, "");
+    static_assert(sum<1, 2>::value == 3, "");
+    static_assert(sum<5, 5, 11>::value == 21, "");
+    static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
+
+  }
+
+  // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+  // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
+  // because of this.
+  namespace test_template_alias_sfinae
+  {
+
+    struct foo {};
+
+    template<typename T>
+    using member = typename T::member_type;
+
+    template<typename T>
+    void func(...) {}
+
+    template<typename T>
+    void func(member<T>*) {}
+
+    void test();
+
+    void test() { func<foo>(0); }
+
+  }
+
+}  // namespace cxx11
+
+#endif  // __cplusplus >= 201103L
+
+
+
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  eval $cachevar=yes
+else
+  eval $cachevar=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+         CXX="$ac_save_CXX"
+fi
+eval ac_res=\$$cachevar
+              { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+      if eval test x\$$cachevar = xyes; then
+        CXX="$CXX $switch"
+        if test -n "$CXXCPP" ; then
+          CXXCPP="$CXXCPP $switch"
+        fi
+        ac_success=yes
+        break
+      fi
+    done
+  fi
+
+    if test x$ac_success = xno; then
+                for alternative in ${ax_cxx_compile_alternatives}; do
+      for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do
+        cachevar=`$as_echo "ax_cv_cxx_compile_cxx11_$switch" | $as_tr_sh`
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features with $switch" >&5
+$as_echo_n "checking whether $CXX supports C++11 features with $switch... " >&6; }
+if eval \${$cachevar+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_save_CXX="$CXX"
+           CXX="$CXX $switch"
+           cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+
+// If the compiler admits that it is not ready for C++11, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201103L
+
+#error "This is not a C++11 compiler"
+
+#else
+
+namespace cxx11
+{
+
+  namespace test_static_assert
+  {
+
+    template <typename T>
+    struct check
+    {
+      static_assert(sizeof(int) <= sizeof(T), "not big enough");
+    };
+
+  }
+
+  namespace test_final_override
+  {
+
+    struct Base
+    {
+      virtual ~Base() {}
+      virtual void f() {}
+    };
+
+    struct Derived : public Base
+    {
+      virtual ~Derived() override {}
+      virtual void f() override {}
+    };
+
+  }
+
+  namespace test_double_right_angle_brackets
+  {
+
+    template < typename T >
+    struct check {};
+
+    typedef check<void> single_type;
+    typedef check<check<void>> double_type;
+    typedef check<check<check<void>>> triple_type;
+    typedef check<check<check<check<void>>>> quadruple_type;
+
+  }
+
+  namespace test_decltype
+  {
+
+    int
+    f()
+    {
+      int a = 1;
+      decltype(a) b = 2;
+      return a + b;
+    }
+
+  }
+
+  namespace test_type_deduction
+  {
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static const bool value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static const bool value = true;
+    };
+
+    template < typename T1, typename T2 >
+    auto
+    add(T1 a1, T2 a2) -> decltype(a1 + a2)
+    {
+      return a1 + a2;
+    }
+
+    int
+    test(const int c, volatile int v)
+    {
+      static_assert(is_same<int, decltype(0)>::value == true, "");
+      static_assert(is_same<int, decltype(c)>::value == false, "");
+      static_assert(is_same<int, decltype(v)>::value == false, "");
+      auto ac = c;
+      auto av = v;
+      auto sumi = ac + av + 'x';
+      auto sumf = ac + av + 1.0;
+      static_assert(is_same<int, decltype(ac)>::value == true, "");
+      static_assert(is_same<int, decltype(av)>::value == true, "");
+      static_assert(is_same<int, decltype(sumi)>::value == true, "");
+      static_assert(is_same<int, decltype(sumf)>::value == false, "");
+      static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
+      return (sumf > 0.0) ? sumi : add(c, v);
+    }
+
+  }
+
+  namespace test_noexcept
+  {
+
+    int f() { return 0; }
+    int g() noexcept { return 0; }
+
+    static_assert(noexcept(f()) == false, "");
+    static_assert(noexcept(g()) == true, "");
+
+  }
+
+  namespace test_constexpr
+  {
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
+    {
+      return *s ? strlen_c_r(s + 1, acc + 1) : acc;
+    }
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c(const CharT *const s) noexcept
+    {
+      return strlen_c_r(s, 0UL);
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("1") == 1UL, "");
+    static_assert(strlen_c("example") == 7UL, "");
+    static_assert(strlen_c("another\0example") == 7UL, "");
+
+  }
+
+  namespace test_rvalue_references
+  {
+
+    template < int N >
+    struct answer
+    {
+      static constexpr int value = N;
+    };
+
+    answer<1> f(int&)       { return answer<1>(); }
+    answer<2> f(const int&) { return answer<2>(); }
+    answer<3> f(int&&)      { return answer<3>(); }
+
+    void
+    test()
+    {
+      int i = 0;
+      const int c = 0;
+      static_assert(decltype(f(i))::value == 1, "");
+      static_assert(decltype(f(c))::value == 2, "");
+      static_assert(decltype(f(0))::value == 3, "");
+    }
+
+  }
+
+  namespace test_uniform_initialization
+  {
+
+    struct test
+    {
+      static const int zero {};
+      static const int one {1};
+    };
+
+    static_assert(test::zero == 0, "");
+    static_assert(test::one == 1, "");
+
+  }
+
+  namespace test_lambdas
+  {
+
+    void
+    test1()
+    {
+      auto lambda1 = [](){};
+      auto lambda2 = lambda1;
+      lambda1();
+      lambda2();
+    }
+
+    int
+    test2()
+    {
+      auto a = [](int i, int j){ return i + j; }(1, 2);
+      auto b = []() -> int { return '0'; }();
+      auto c = [=](){ return a + b; }();
+      auto d = [&](){ return c; }();
+      auto e = [a, &b](int x) mutable {
+        const auto identity = [](int y){ return y; };
+        for (auto i = 0; i < a; ++i)
+          a += b--;
+        return x + identity(a + b);
+      }(0);
+      return a + b + c + d + e;
+    }
+
+    int
+    test3()
+    {
+      const auto nullary = [](){ return 0; };
+      const auto unary = [](int x){ return x; };
+      using nullary_t = decltype(nullary);
+      using unary_t = decltype(unary);
+      const auto higher1st = [](nullary_t f){ return f(); };
+      const auto higher2nd = [unary](nullary_t f1){
+        return [unary, f1](unary_t f2){ return f2(unary(f1())); };
+      };
+      return higher1st(nullary) + higher2nd(nullary)(unary);
+    }
+
+  }
+
+  namespace test_variadic_templates
+  {
+
+    template <int...>
+    struct sum;
+
+    template <int N0, int... N1toN>
+    struct sum<N0, N1toN...>
+    {
+      static constexpr auto value = N0 + sum<N1toN...>::value;
+    };
+
+    template <>
+    struct sum<>
+    {
+      static constexpr auto value = 0;
+    };
+
+    static_assert(sum<>::value == 0, "");
+    static_assert(sum<1>::value == 1, "");
+    static_assert(sum<23>::value == 23, "");
+    static_assert(sum<1, 2>::value == 3, "");
+    static_assert(sum<5, 5, 11>::value == 21, "");
+    static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
+
+  }
+
+  // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+  // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
+  // because of this.
+  namespace test_template_alias_sfinae
+  {
+
+    struct foo {};
+
+    template<typename T>
+    using member = typename T::member_type;
+
+    template<typename T>
+    void func(...) {}
+
+    template<typename T>
+    void func(member<T>*) {}
+
+    void test();
+
+    void test() { func<foo>(0); }
+
+  }
+
+}  // namespace cxx11
+
+#endif  // __cplusplus >= 201103L
+
+
+
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  eval $cachevar=yes
+else
+  eval $cachevar=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+           CXX="$ac_save_CXX"
+fi
+eval ac_res=\$$cachevar
+              { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+        if eval test x\$$cachevar = xyes; then
+          CXX="$CXX $switch"
+          if test -n "$CXXCPP" ; then
+            CXXCPP="$CXXCPP $switch"
+          fi
+          ac_success=yes
+          break
+        fi
+      done
+      if test x$ac_success = xyes; then
+        break
+      fi
+    done
+  fi
+
+  ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+  if test x$ax_cxx_compile_cxx11_required = xtrue; then
+    if test x$ac_success = xno; then
+      as_fn_error $? "*** A compiler with support for C++11 language features is required." "$LINENO" 5
+    fi
+  fi
+  if test x$ac_success = xno; then
+    HAVE_CXX11=0
+    { $as_echo "$as_me:${as_lineno-$LINENO}: No compiler with C++11 support was found" >&5
+$as_echo "$as_me: No compiler with C++11 support was found" >&6;}
+  else
+    HAVE_CXX11=1
+
+$as_echo "#define HAVE_CXX11 1" >>confdefs.h
+
+  fi
+
+
+
+  if test "${build}" != "${host}"; then
+      ax_cxx_compile_alternatives="11 0x"    ax_cxx_compile_cxx11_required=true
+  ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+  ac_success=no
+      ax_cv_cxx_compile_cxx11_orig_cxx="$CXX"
+    ax_cv_cxx_compile_cxx11_orig_cxxflags="$CXXFLAGS"
+    ax_cv_cxx_compile_cxx11_orig_cppflags="$CPPFLAGS"
+    CXX="$CXX_FOR_BUILD"
+    CXXFLAGS="$CXXFLAGS_FOR_BUILD"
+    CPPFLAGS="$CPPFLAGS_FOR_BUILD"
+      { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features by default" >&5
+$as_echo_n "checking whether $CXX supports C++11 features by default... " >&6; }
+if ${ax_cv_cxx_compile_cxx11_FOR_BUILD+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+
+// If the compiler admits that it is not ready for C++11, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201103L
+
+#error "This is not a C++11 compiler"
+
+#else
+
+namespace cxx11
+{
+
+  namespace test_static_assert
+  {
+
+    template <typename T>
+    struct check
+    {
+      static_assert(sizeof(int) <= sizeof(T), "not big enough");
+    };
+
+  }
+
+  namespace test_final_override
+  {
+
+    struct Base
+    {
+      virtual ~Base() {}
+      virtual void f() {}
+    };
+
+    struct Derived : public Base
+    {
+      virtual ~Derived() override {}
+      virtual void f() override {}
+    };
+
+  }
+
+  namespace test_double_right_angle_brackets
+  {
+
+    template < typename T >
+    struct check {};
+
+    typedef check<void> single_type;
+    typedef check<check<void>> double_type;
+    typedef check<check<check<void>>> triple_type;
+    typedef check<check<check<check<void>>>> quadruple_type;
+
+  }
+
+  namespace test_decltype
+  {
+
+    int
+    f()
+    {
+      int a = 1;
+      decltype(a) b = 2;
+      return a + b;
+    }
+
+  }
+
+  namespace test_type_deduction
+  {
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static const bool value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static const bool value = true;
+    };
+
+    template < typename T1, typename T2 >
+    auto
+    add(T1 a1, T2 a2) -> decltype(a1 + a2)
+    {
+      return a1 + a2;
+    }
+
+    int
+    test(const int c, volatile int v)
+    {
+      static_assert(is_same<int, decltype(0)>::value == true, "");
+      static_assert(is_same<int, decltype(c)>::value == false, "");
+      static_assert(is_same<int, decltype(v)>::value == false, "");
+      auto ac = c;
+      auto av = v;
+      auto sumi = ac + av + 'x';
+      auto sumf = ac + av + 1.0;
+      static_assert(is_same<int, decltype(ac)>::value == true, "");
+      static_assert(is_same<int, decltype(av)>::value == true, "");
+      static_assert(is_same<int, decltype(sumi)>::value == true, "");
+      static_assert(is_same<int, decltype(sumf)>::value == false, "");
+      static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
+      return (sumf > 0.0) ? sumi : add(c, v);
+    }
+
+  }
+
+  namespace test_noexcept
+  {
+
+    int f() { return 0; }
+    int g() noexcept { return 0; }
+
+    static_assert(noexcept(f()) == false, "");
+    static_assert(noexcept(g()) == true, "");
+
+  }
+
+  namespace test_constexpr
+  {
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
+    {
+      return *s ? strlen_c_r(s + 1, acc + 1) : acc;
+    }
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c(const CharT *const s) noexcept
+    {
+      return strlen_c_r(s, 0UL);
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("1") == 1UL, "");
+    static_assert(strlen_c("example") == 7UL, "");
+    static_assert(strlen_c("another\0example") == 7UL, "");
+
+  }
+
+  namespace test_rvalue_references
+  {
+
+    template < int N >
+    struct answer
+    {
+      static constexpr int value = N;
+    };
+
+    answer<1> f(int&)       { return answer<1>(); }
+    answer<2> f(const int&) { return answer<2>(); }
+    answer<3> f(int&&)      { return answer<3>(); }
+
+    void
+    test()
+    {
+      int i = 0;
+      const int c = 0;
+      static_assert(decltype(f(i))::value == 1, "");
+      static_assert(decltype(f(c))::value == 2, "");
+      static_assert(decltype(f(0))::value == 3, "");
+    }
+
+  }
+
+  namespace test_uniform_initialization
+  {
+
+    struct test
+    {
+      static const int zero {};
+      static const int one {1};
+    };
+
+    static_assert(test::zero == 0, "");
+    static_assert(test::one == 1, "");
+
+  }
+
+  namespace test_lambdas
+  {
+
+    void
+    test1()
+    {
+      auto lambda1 = [](){};
+      auto lambda2 = lambda1;
+      lambda1();
+      lambda2();
+    }
+
+    int
+    test2()
+    {
+      auto a = [](int i, int j){ return i + j; }(1, 2);
+      auto b = []() -> int { return '0'; }();
+      auto c = [=](){ return a + b; }();
+      auto d = [&](){ return c; }();
+      auto e = [a, &b](int x) mutable {
+        const auto identity = [](int y){ return y; };
+        for (auto i = 0; i < a; ++i)
+          a += b--;
+        return x + identity(a + b);
+      }(0);
+      return a + b + c + d + e;
+    }
+
+    int
+    test3()
+    {
+      const auto nullary = [](){ return 0; };
+      const auto unary = [](int x){ return x; };
+      using nullary_t = decltype(nullary);
+      using unary_t = decltype(unary);
+      const auto higher1st = [](nullary_t f){ return f(); };
+      const auto higher2nd = [unary](nullary_t f1){
+        return [unary, f1](unary_t f2){ return f2(unary(f1())); };
+      };
+      return higher1st(nullary) + higher2nd(nullary)(unary);
+    }
+
+  }
+
+  namespace test_variadic_templates
+  {
+
+    template <int...>
+    struct sum;
+
+    template <int N0, int... N1toN>
+    struct sum<N0, N1toN...>
+    {
+      static constexpr auto value = N0 + sum<N1toN...>::value;
+    };
+
+    template <>
+    struct sum<>
+    {
+      static constexpr auto value = 0;
+    };
+
+    static_assert(sum<>::value == 0, "");
+    static_assert(sum<1>::value == 1, "");
+    static_assert(sum<23>::value == 23, "");
+    static_assert(sum<1, 2>::value == 3, "");
+    static_assert(sum<5, 5, 11>::value == 21, "");
+    static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
+
+  }
+
+  // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+  // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
+  // because of this.
+  namespace test_template_alias_sfinae
+  {
+
+    struct foo {};
+
+    template<typename T>
+    using member = typename T::member_type;
+
+    template<typename T>
+    void func(...) {}
+
+    template<typename T>
+    void func(member<T>*) {}
+
+    void test();
+
+    void test() { func<foo>(0); }
+
+  }
+
+}  // namespace cxx11
+
+#endif  // __cplusplus >= 201103L
+
+
+
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  ax_cv_cxx_compile_cxx11_FOR_BUILD=yes
+else
+  ax_cv_cxx_compile_cxx11_FOR_BUILD=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_cxx_compile_cxx11_FOR_BUILD" >&5
+$as_echo "$ax_cv_cxx_compile_cxx11_FOR_BUILD" >&6; }
+    if test x$ax_cv_cxx_compile_cxx11_FOR_BUILD = xyes; then
+      ac_success=yes
+    fi
+
+    if test x$ac_success = xno; then
+    for alternative in ${ax_cxx_compile_alternatives}; do
+      switch="-std=gnu++${alternative}"
+      cachevar=`$as_echo "ax_cv_cxx_compile_cxx11_FOR_BUILD_$switch" | $as_tr_sh`
+      { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features with $switch" >&5
+$as_echo_n "checking whether $CXX supports C++11 features with $switch... " >&6; }
+if eval \${$cachevar+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_save_CXX="$CXX"
+         CXX="$CXX $switch"
+         cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+
+// If the compiler admits that it is not ready for C++11, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201103L
+
+#error "This is not a C++11 compiler"
+
+#else
+
+namespace cxx11
+{
+
+  namespace test_static_assert
+  {
+
+    template <typename T>
+    struct check
+    {
+      static_assert(sizeof(int) <= sizeof(T), "not big enough");
+    };
+
+  }
+
+  namespace test_final_override
+  {
+
+    struct Base
+    {
+      virtual ~Base() {}
+      virtual void f() {}
+    };
+
+    struct Derived : public Base
+    {
+      virtual ~Derived() override {}
+      virtual void f() override {}
+    };
+
+  }
+
+  namespace test_double_right_angle_brackets
+  {
+
+    template < typename T >
+    struct check {};
+
+    typedef check<void> single_type;
+    typedef check<check<void>> double_type;
+    typedef check<check<check<void>>> triple_type;
+    typedef check<check<check<check<void>>>> quadruple_type;
+
+  }
+
+  namespace test_decltype
+  {
+
+    int
+    f()
+    {
+      int a = 1;
+      decltype(a) b = 2;
+      return a + b;
+    }
+
+  }
+
+  namespace test_type_deduction
+  {
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static const bool value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static const bool value = true;
+    };
+
+    template < typename T1, typename T2 >
+    auto
+    add(T1 a1, T2 a2) -> decltype(a1 + a2)
+    {
+      return a1 + a2;
+    }
+
+    int
+    test(const int c, volatile int v)
+    {
+      static_assert(is_same<int, decltype(0)>::value == true, "");
+      static_assert(is_same<int, decltype(c)>::value == false, "");
+      static_assert(is_same<int, decltype(v)>::value == false, "");
+      auto ac = c;
+      auto av = v;
+      auto sumi = ac + av + 'x';
+      auto sumf = ac + av + 1.0;
+      static_assert(is_same<int, decltype(ac)>::value == true, "");
+      static_assert(is_same<int, decltype(av)>::value == true, "");
+      static_assert(is_same<int, decltype(sumi)>::value == true, "");
+      static_assert(is_same<int, decltype(sumf)>::value == false, "");
+      static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
+      return (sumf > 0.0) ? sumi : add(c, v);
+    }
+
+  }
+
+  namespace test_noexcept
+  {
+
+    int f() { return 0; }
+    int g() noexcept { return 0; }
+
+    static_assert(noexcept(f()) == false, "");
+    static_assert(noexcept(g()) == true, "");
+
+  }
+
+  namespace test_constexpr
+  {
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
+    {
+      return *s ? strlen_c_r(s + 1, acc + 1) : acc;
+    }
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c(const CharT *const s) noexcept
+    {
+      return strlen_c_r(s, 0UL);
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("1") == 1UL, "");
+    static_assert(strlen_c("example") == 7UL, "");
+    static_assert(strlen_c("another\0example") == 7UL, "");
+
+  }
+
+  namespace test_rvalue_references
+  {
+
+    template < int N >
+    struct answer
+    {
+      static constexpr int value = N;
+    };
+
+    answer<1> f(int&)       { return answer<1>(); }
+    answer<2> f(const int&) { return answer<2>(); }
+    answer<3> f(int&&)      { return answer<3>(); }
+
+    void
+    test()
+    {
+      int i = 0;
+      const int c = 0;
+      static_assert(decltype(f(i))::value == 1, "");
+      static_assert(decltype(f(c))::value == 2, "");
+      static_assert(decltype(f(0))::value == 3, "");
+    }
+
+  }
+
+  namespace test_uniform_initialization
+  {
+
+    struct test
+    {
+      static const int zero {};
+      static const int one {1};
+    };
+
+    static_assert(test::zero == 0, "");
+    static_assert(test::one == 1, "");
+
+  }
+
+  namespace test_lambdas
+  {
+
+    void
+    test1()
+    {
+      auto lambda1 = [](){};
+      auto lambda2 = lambda1;
+      lambda1();
+      lambda2();
+    }
+
+    int
+    test2()
+    {
+      auto a = [](int i, int j){ return i + j; }(1, 2);
+      auto b = []() -> int { return '0'; }();
+      auto c = [=](){ return a + b; }();
+      auto d = [&](){ return c; }();
+      auto e = [a, &b](int x) mutable {
+        const auto identity = [](int y){ return y; };
+        for (auto i = 0; i < a; ++i)
+          a += b--;
+        return x + identity(a + b);
+      }(0);
+      return a + b + c + d + e;
+    }
+
+    int
+    test3()
+    {
+      const auto nullary = [](){ return 0; };
+      const auto unary = [](int x){ return x; };
+      using nullary_t = decltype(nullary);
+      using unary_t = decltype(unary);
+      const auto higher1st = [](nullary_t f){ return f(); };
+      const auto higher2nd = [unary](nullary_t f1){
+        return [unary, f1](unary_t f2){ return f2(unary(f1())); };
+      };
+      return higher1st(nullary) + higher2nd(nullary)(unary);
+    }
+
+  }
+
+  namespace test_variadic_templates
+  {
+
+    template <int...>
+    struct sum;
+
+    template <int N0, int... N1toN>
+    struct sum<N0, N1toN...>
+    {
+      static constexpr auto value = N0 + sum<N1toN...>::value;
+    };
+
+    template <>
+    struct sum<>
+    {
+      static constexpr auto value = 0;
+    };
+
+    static_assert(sum<>::value == 0, "");
+    static_assert(sum<1>::value == 1, "");
+    static_assert(sum<23>::value == 23, "");
+    static_assert(sum<1, 2>::value == 3, "");
+    static_assert(sum<5, 5, 11>::value == 21, "");
+    static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
+
+  }
+
+  // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+  // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
+  // because of this.
+  namespace test_template_alias_sfinae
+  {
+
+    struct foo {};
+
+    template<typename T>
+    using member = typename T::member_type;
+
+    template<typename T>
+    void func(...) {}
+
+    template<typename T>
+    void func(member<T>*) {}
+
+    void test();
+
+    void test() { func<foo>(0); }
+
+  }
+
+}  // namespace cxx11
+
+#endif  // __cplusplus >= 201103L
+
+
+
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  eval $cachevar=yes
+else
+  eval $cachevar=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+         CXX="$ac_save_CXX"
+fi
+eval ac_res=\$$cachevar
+              { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+      if eval test x\$$cachevar = xyes; then
+        CXX="$CXX $switch"
+        if test -n "$CXXCPP" ; then
+          CXXCPP="$CXXCPP $switch"
+        fi
+        ac_success=yes
+        break
+      fi
+    done
+  fi
+
+    if test x$ac_success = xno; then
+                for alternative in ${ax_cxx_compile_alternatives}; do
+      for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do
+        cachevar=`$as_echo "ax_cv_cxx_compile_cxx11_FOR_BUILD_$switch" | $as_tr_sh`
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features with $switch" >&5
+$as_echo_n "checking whether $CXX supports C++11 features with $switch... " >&6; }
+if eval \${$cachevar+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_save_CXX="$CXX"
+           CXX="$CXX $switch"
+           cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+
+// If the compiler admits that it is not ready for C++11, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201103L
+
+#error "This is not a C++11 compiler"
+
+#else
+
+namespace cxx11
+{
+
+  namespace test_static_assert
+  {
+
+    template <typename T>
+    struct check
+    {
+      static_assert(sizeof(int) <= sizeof(T), "not big enough");
+    };
+
+  }
+
+  namespace test_final_override
+  {
+
+    struct Base
+    {
+      virtual ~Base() {}
+      virtual void f() {}
+    };
+
+    struct Derived : public Base
+    {
+      virtual ~Derived() override {}
+      virtual void f() override {}
+    };
+
+  }
+
+  namespace test_double_right_angle_brackets
+  {
+
+    template < typename T >
+    struct check {};
+
+    typedef check<void> single_type;
+    typedef check<check<void>> double_type;
+    typedef check<check<check<void>>> triple_type;
+    typedef check<check<check<check<void>>>> quadruple_type;
+
+  }
+
+  namespace test_decltype
+  {
+
+    int
+    f()
+    {
+      int a = 1;
+      decltype(a) b = 2;
+      return a + b;
+    }
+
+  }
+
+  namespace test_type_deduction
+  {
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static const bool value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static const bool value = true;
+    };
+
+    template < typename T1, typename T2 >
+    auto
+    add(T1 a1, T2 a2) -> decltype(a1 + a2)
+    {
+      return a1 + a2;
+    }
+
+    int
+    test(const int c, volatile int v)
+    {
+      static_assert(is_same<int, decltype(0)>::value == true, "");
+      static_assert(is_same<int, decltype(c)>::value == false, "");
+      static_assert(is_same<int, decltype(v)>::value == false, "");
+      auto ac = c;
+      auto av = v;
+      auto sumi = ac + av + 'x';
+      auto sumf = ac + av + 1.0;
+      static_assert(is_same<int, decltype(ac)>::value == true, "");
+      static_assert(is_same<int, decltype(av)>::value == true, "");
+      static_assert(is_same<int, decltype(sumi)>::value == true, "");
+      static_assert(is_same<int, decltype(sumf)>::value == false, "");
+      static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
+      return (sumf > 0.0) ? sumi : add(c, v);
+    }
+
+  }
+
+  namespace test_noexcept
+  {
+
+    int f() { return 0; }
+    int g() noexcept { return 0; }
+
+    static_assert(noexcept(f()) == false, "");
+    static_assert(noexcept(g()) == true, "");
+
+  }
+
+  namespace test_constexpr
+  {
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
+    {
+      return *s ? strlen_c_r(s + 1, acc + 1) : acc;
+    }
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c(const CharT *const s) noexcept
+    {
+      return strlen_c_r(s, 0UL);
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("1") == 1UL, "");
+    static_assert(strlen_c("example") == 7UL, "");
+    static_assert(strlen_c("another\0example") == 7UL, "");
+
+  }
+
+  namespace test_rvalue_references
+  {
+
+    template < int N >
+    struct answer
+    {
+      static constexpr int value = N;
+    };
+
+    answer<1> f(int&)       { return answer<1>(); }
+    answer<2> f(const int&) { return answer<2>(); }
+    answer<3> f(int&&)      { return answer<3>(); }
+
+    void
+    test()
+    {
+      int i = 0;
+      const int c = 0;
+      static_assert(decltype(f(i))::value == 1, "");
+      static_assert(decltype(f(c))::value == 2, "");
+      static_assert(decltype(f(0))::value == 3, "");
+    }
+
+  }
+
+  namespace test_uniform_initialization
+  {
+
+    struct test
+    {
+      static const int zero {};
+      static const int one {1};
+    };
+
+    static_assert(test::zero == 0, "");
+    static_assert(test::one == 1, "");
+
+  }
+
+  namespace test_lambdas
+  {
+
+    void
+    test1()
+    {
+      auto lambda1 = [](){};
+      auto lambda2 = lambda1;
+      lambda1();
+      lambda2();
+    }
+
+    int
+    test2()
+    {
+      auto a = [](int i, int j){ return i + j; }(1, 2);
+      auto b = []() -> int { return '0'; }();
+      auto c = [=](){ return a + b; }();
+      auto d = [&](){ return c; }();
+      auto e = [a, &b](int x) mutable {
+        const auto identity = [](int y){ return y; };
+        for (auto i = 0; i < a; ++i)
+          a += b--;
+        return x + identity(a + b);
+      }(0);
+      return a + b + c + d + e;
+    }
+
+    int
+    test3()
+    {
+      const auto nullary = [](){ return 0; };
+      const auto unary = [](int x){ return x; };
+      using nullary_t = decltype(nullary);
+      using unary_t = decltype(unary);
+      const auto higher1st = [](nullary_t f){ return f(); };
+      const auto higher2nd = [unary](nullary_t f1){
+        return [unary, f1](unary_t f2){ return f2(unary(f1())); };
+      };
+      return higher1st(nullary) + higher2nd(nullary)(unary);
+    }
+
+  }
+
+  namespace test_variadic_templates
+  {
+
+    template <int...>
+    struct sum;
+
+    template <int N0, int... N1toN>
+    struct sum<N0, N1toN...>
+    {
+      static constexpr auto value = N0 + sum<N1toN...>::value;
+    };
+
+    template <>
+    struct sum<>
+    {
+      static constexpr auto value = 0;
+    };
+
+    static_assert(sum<>::value == 0, "");
+    static_assert(sum<1>::value == 1, "");
+    static_assert(sum<23>::value == 23, "");
+    static_assert(sum<1, 2>::value == 3, "");
+    static_assert(sum<5, 5, 11>::value == 21, "");
+    static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
+
+  }
+
+  // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+  // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
+  // because of this.
+  namespace test_template_alias_sfinae
+  {
+
+    struct foo {};
+
+    template<typename T>
+    using member = typename T::member_type;
+
+    template<typename T>
+    void func(...) {}
+
+    template<typename T>
+    void func(member<T>*) {}
+
+    void test();
+
+    void test() { func<foo>(0); }
+
+  }
+
+}  // namespace cxx11
+
+#endif  // __cplusplus >= 201103L
+
+
+
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  eval $cachevar=yes
+else
+  eval $cachevar=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+           CXX="$ac_save_CXX"
+fi
+eval ac_res=\$$cachevar
+              { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+        if eval test x\$$cachevar = xyes; then
+          CXX="$CXX $switch"
+          if test -n "$CXXCPP" ; then
+            CXXCPP="$CXXCPP $switch"
+          fi
+          ac_success=yes
+          break
+        fi
+      done
+      if test x$ac_success = xyes; then
+        break
+      fi
+    done
+  fi
+      CXX_FOR_BUILD="$CXX"
+    CXXFLAGS_FOR_BUILD="$CXXFLAGS"
+    CPPFLAGS_FOR_BUILD="$CPPFLAGS"
+    CXX="$ax_cv_cxx_compile_cxx11_orig_cxx"
+    CXXFLAGS="$ax_cv_cxx_compile_cxx11_orig_cxxflags"
+    CPPFLAGS="$ax_cv_cxx_compile_cxx11_orig_cppflags"
+  ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+  if test x$ax_cxx_compile_cxx11_required = xtrue; then
+    if test x$ac_success = xno; then
+      as_fn_error $? "*** A compiler with support for C++11 language features is required." "$LINENO" 5
+    fi
+  fi
+  if test x$ac_success = xno; then
+    HAVE_CXX11_FOR_BUILD=0
+    { $as_echo "$as_me:${as_lineno-$LINENO}: No compiler with C++11 support was found" >&5
+$as_echo "$as_me: No compiler with C++11 support was found" >&6;}
+  else
+    HAVE_CXX11_FOR_BUILD=1
+
+$as_echo "#define HAVE_CXX11_FOR_BUILD 1" >>confdefs.h
+
+  fi
+
+
+  fi
+fi
+
+# Check whether --enable-pgo-build was given.
+if test "${enable_pgo_build+set}" = set; then :
+  enableval=$enable_pgo_build; enable_pgo_build=$enableval
+else
+  enable_pgo_build=no
+fi
+
+
+# Issue errors and warnings for invalid/strange PGO build combinations.
+case "$have_compiler:$host:$target:$enable_pgo_build" in
+  *:*:*:no) ;;
+
+  # Allow the PGO build only if we aren't building a compiler and
+  # we are in a native configuration.
+  no:$build:$build:yes | no:$build:$build:lto) ;;
+
+  # Disallow the PGO bootstrap if we are building a compiler.
+  yes:*:*:yes | yes:*:*:lto)
+    as_fn_error $? "cannot perform the PGO bootstrap when building a compiler" "$LINENO" 5 ;;
+
+  *)
+    as_fn_error $? "invalid option for --enable-pgo-build" "$LINENO" 5
+    ;;
+esac
+
+if test "$enable_pgo_build" != "no"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -fprofile-generate" >&5
+$as_echo_n "checking whether the compiler supports -fprofile-generate... " >&6; }
+  old_CFLAGS="$CFLAGS"
+  PGO_BUILD_GEN_CFLAGS="-fprofile-generate"
+  CFLAGS="$CFLAGS $PGO_BUILD_CFLAGS"
+
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+else
+  PGO_BUILD_GEN_CFLAGS=
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+  CFLAGS="$old_CFLAGS"
+  if test -n "$PGO_BUILD_GEN_CFLAGS"; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+    PGO_BUILD_USE_CFLAGS="-fprofile-use"
+  else
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+    as_fn_error $? "cannot perform the PGO build without -fprofile-generate" "$LINENO" 5
+  fi
+
+  if test "$enable_pgo_build" = "lto"; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -flto=jobserver -ffat-lto-objects" >&5
+$as_echo_n "checking whether the compiler supports -flto=jobserver -ffat-lto-objects... " >&6; }
+    old_CFLAGS="$CFLAGS"
+    PGO_BUILD_LTO_CFLAGS="-flto=jobserver -ffat-lto-objects"
+    CFLAGS="$CFLAGS $PGO_BUILD_LTO_CFLAGS"
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+else
+  PGO_BUILD_LTO_CFLAGS=
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+    CFLAGS="$old_CFLAGS"
+    if test -n "$PGO_BUILD_LTO_CFLAGS"; then
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+    else
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+      { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: LTO is disabled for the PGO build" >&5
+$as_echo "$as_me: WARNING: LTO is disabled for the PGO build" >&2;}
+    fi
+  fi
+fi
+
+
+
+
+# Used for setting $lt_cv_objdir
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for objdir" >&5
+$as_echo_n "checking for objdir... " >&6; }
+if ${lt_cv_objdir+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  rm -f .libs 2>/dev/null
+mkdir .libs 2>/dev/null
+if test -d .libs; then
+  lt_cv_objdir=.libs
+else
+  # MS-DOS does not allow filenames that begin with a dot.
+  lt_cv_objdir=_libs
+fi
+rmdir .libs 2>/dev/null
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $lt_cv_objdir" >&5
+$as_echo "$lt_cv_objdir" >&6; }
+objdir=$lt_cv_objdir
+
+
+
+
+
+cat >>confdefs.h <<_ACEOF
+#define LT_OBJDIR "$lt_cv_objdir/"
+_ACEOF
+
+
+
+# Check for GMP, MPFR and MPC
+gmplibs="-lmpc -lmpfr -lgmp"
+gmpinc=
+have_gmp=no
+
+# Specify a location for mpc
+# check for this first so it ends up on the link line before mpfr.
+
+# Check whether --with-mpc was given.
+if test "${with_mpc+set}" = set; then :
+  withval=$with_mpc;
+fi
+
+
+# Check whether --with-mpc-include was given.
+if test "${with_mpc_include+set}" = set; then :
+  withval=$with_mpc_include;
+fi
+
+
+# Check whether --with-mpc-lib was given.
+if test "${with_mpc_lib+set}" = set; then :
+  withval=$with_mpc_lib;
+fi
+
+
+if test "x$with_mpc" != x; then
+  gmplibs="-L$with_mpc/lib $gmplibs"
+  gmpinc="-I$with_mpc/include $gmpinc"
+fi
+if test "x$with_mpc_include" != x; then
+  gmpinc="-I$with_mpc_include $gmpinc"
+fi
+if test "x$with_mpc_lib" != x; then
+  gmplibs="-L$with_mpc_lib $gmplibs"
+fi
+if test "x$with_mpc$with_mpc_include$with_mpc_lib" = x && test -d ${srcdir}/mpc; then
+  gmplibs='-L$$r/$(HOST_SUBDIR)/mpc/src/'"$lt_cv_objdir $gmplibs"
+  gmpinc='-I$$s/mpc/src '"$gmpinc"
+  # Do not test the mpc version.  Assume that it is sufficient, since
+  # it is in the source tree, and the library has not been built yet
+  # but it would be included on the link line in the version check below
+  # hence making the test fail.
+  have_gmp=yes
+fi
+
+# Specify a location for mpfr
+# check for this first so it ends up on the link line before gmp.
+
+# Check whether --with-mpfr was given.
+if test "${with_mpfr+set}" = set; then :
+  withval=$with_mpfr;
+fi
 
 
 # Check whether --with-mpfr-include was given.
@@ -5865,14 +7976,6 @@ fi
 
 # Specify a location for gmp
 
-# Check whether --with-gmp-dir was given.
-if test "${with_gmp_dir+set}" = set; then :
-  withval=$with_gmp_dir; as_fn_error $? "The --with-gmp-dir=PATH option has been removed.
-Use --with-gmp=PATH or --with-gmp-include=PATH plus --with-gmp-lib=PATH" "$LINENO" 5
-fi
-
-
-
 # Check whether --with-gmp was given.
 if test "${with_gmp+set}" = set; then :
   withval=$with_gmp;
@@ -5984,7 +8087,7 @@ int
 main ()
 {
 
-    #if MPFR_VERSION < MPFR_VERSION_NUM(2,4,0)
+    #if MPFR_VERSION < MPFR_VERSION_NUM(3,1,0)
     choke me
     #endif
 
@@ -6001,7 +8104,7 @@ int
 main ()
 {
 
-    #if MPFR_VERSION < MPFR_VERSION_NUM(2,4,2)
+    #if MPFR_VERSION < MPFR_VERSION_NUM(3,1,6)
     choke me
     #endif
 
@@ -6094,9 +8197,9 @@ main ()
     int t;
     mpfr_init (n);
     mpfr_init (x);
-    mpfr_atan2 (n, n, x, GMP_RNDN);
-    mpfr_erfc (n, x, GMP_RNDN);
-    mpfr_subnormalize (x, t, GMP_RNDN);
+    mpfr_atan2 (n, n, x, MPFR_RNDN);
+    mpfr_erfc (n, x, MPFR_RNDN);
+    mpfr_subnormalize (x, t, MPFR_RNDN);
     mpfr_clear(n);
     mpfr_clear(x);
     mpc_init2 (c, 53);
@@ -6127,11 +8230,11 @@ rm -f core conftest.err conftest.$ac_objext \
 # The library versions listed in the error message below should match
 # the HARD-minimums enforced above.
   if test x$have_gmp != xyes; then
-    as_fn_error $? "Building GCC requires GMP 4.2+, MPFR 2.4.0+ and MPC 0.8.0+.
+    as_fn_error $? "Building GCC requires GMP 4.2+, MPFR 3.1.0+ and MPC 0.8.0+.
 Try the --with-gmp, --with-mpfr and/or --with-mpc options to specify
 their locations.  Source code for these libraries can be found at
 their respective hosting sites as well as at
-ftp://gcc.gnu.org/pub/gcc/infrastructure/.  See also
+https://gcc.gnu.org/pub/gcc/infrastructure/.  See also
 http://gcc.gnu.org/install/prerequisites.html for additional info.  If
 you obtained GMP, MPFR and/or MPC from a vendor distribution package,
 make sure that you have installed both the libraries and the header
@@ -6471,8 +8574,20 @@ fi
 # Check whether --enable-host-shared was given.
 if test "${enable_host_shared+set}" = set; then :
   enableval=$enable_host_shared; host_shared=$enableval
+ case $host in
+   x86_64-*-darwin* | aarch64-*-darwin*)
+     if test x$host_shared != xyes ; then
+       # PIC is the default, and actually cannot be switched off.
+       echo configure.ac: warning: PIC code is required for the configured target, host-shared setting ignored. 1>&2
+       host_shared=yes
+     fi ;;
+  *) ;;
+ esac
 else
-  host_shared=no
+  case $host in
+  x86_64-*-darwin* | aarch64-*-darwin*) host_shared=yes ;;
+  *) host_shared=no ;;
+ esac
 fi
 
 
@@ -6691,10 +8806,32 @@ $as_echo "$as_me: WARNING: GNAT is required to build $language" >&2;}
             ;;
         esac
 
+        # Disable D if no preexisting GDC is available.
+        case ${add_this_lang}:${language}:${have_gdc} in
+          yes:d:no)
+            # Specifically requested language; tell them.
+            as_fn_error $? "GDC is required to build $language" "$LINENO" 5
+           ;;
+          all:d:no)
+            { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: GDC is required to build $language" >&5
+$as_echo "$as_me: WARNING: GDC is required to build $language" >&2;}
+            add_this_lang=unsupported
+            ;;
+          *:d:no)
+            # Silently disable.
+            add_this_lang=unsupported
+            ;;
+        esac
+
         # Disable jit if -enable-host-shared not specified
-        case ${add_this_lang}:${language}:${host_shared} in
-          yes:jit:no)
-           # PR jit/64780: explicitly specify --enable-host-shared
+        # but not if building for Mingw. All code in Windows
+        # is position independent code (PIC).
+        case $target in
+          *mingw*) ;;
+          *)
+          case ${add_this_lang}:${language}:${host_shared} in
+            yes:jit:no)
+                  # PR jit/64780: explicitly specify --enable-host-shared
            as_fn_error $? "
 Enabling language \"jit\" requires --enable-host-shared.
 
@@ -6705,17 +8842,19 @@ If you want to build both the jit and the regular compiler, it is often
 best to do this via two separate configure/builds, in separate
 directories, to avoid imposing the performance cost of
 --enable-host-shared on the regular compiler." "$LINENO" 5
-           ;;
-          all:jit:no)
-           { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: --enable-host-shared required to build $language" >&5
+                   ;;
+            all:jit:no)
+             { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: --enable-host-shared required to build $language" >&5
 $as_echo "$as_me: WARNING: --enable-host-shared required to build $language" >&2;}
-            add_this_lang=unsupported
-            ;;
-          *:jit:no)
-            # Silently disable.
-            add_this_lang=unsupported
-            ;;
-       esac
+              add_this_lang=unsupported
+              ;;
+            *:jit:no)
+              # Silently disable.
+              add_this_lang=unsupported
+              ;;
+               esac
+          ;;
+        esac
 
         # Disable a language that is unsupported by the target.
        case "${add_this_lang}: $unsupported_languages " in
@@ -6753,7 +8892,7 @@ $as_echo "$as_me: WARNING: ${language} not supported for this target" >&2;}
                  *) stage1_languages="${stage1_languages}${language}," ;;
                esac
                # We need to bootstrap any supporting libraries.
-               bootstrap_target_libs="${bootstrap_target_libs}${target_libs},"
+               bootstrap_target_libs=`echo "${bootstrap_target_libs}${target_libs}," | sed "s/ /,/g"`
                ;;
            esac
            ;;
@@ -7513,7 +9652,7 @@ fi
 # or bootstrap-ubsan, bootstrap it.
 if echo " ${target_configdirs} " | grep " libsanitizer " > /dev/null 2>&1; then
   case "$BUILD_CONFIG" in
-    *bootstrap-asan* | *bootstrap-ubsan* )
+    *bootstrap-hwasan* | *bootstrap-asan* | *bootstrap-ubsan* )
       bootstrap_target_libs=${bootstrap_target_libs}target-libsanitizer,
       bootstrap_fixincludes=yes
       ;;
@@ -7526,6 +9665,16 @@ if echo " ${target_configdirs} " | grep " libvtv " > /dev/null 2>&1 &&
   bootstrap_target_libs=${bootstrap_target_libs}target-libvtv,
 fi
 
+# If we are building libatomic and the list of enabled languages includes the
+# D frontend, bootstrap it.
+if echo " ${target_configdirs} " | grep " libatomic " > /dev/null 2>&1; then
+  case ,${enable_languages}, in
+    *,d,*)
+      bootstrap_target_libs=${bootstrap_target_libs}target-libatomic,
+      ;;
+  esac
+fi
+
 # Determine whether gdb needs tk/tcl or not.
 # Use 'maybe' since enable_gdbtk might be true even if tk isn't available
 # and in that case we want gdb to be built without tk.  Ugh!
@@ -8060,6 +10209,17 @@ case "${target}" in
   mep*)
     FLAGS_FOR_TARGET="$FLAGS_FOR_TARGET -mlibrary"
     ;;
+  # The VxWorks support for shared libraries is getting in
+  # incrementally.  Make sure it doesn't get activated implicitly:
+  *vxworks*)
+    if test "${enable_shared-unset}" = unset ; then
+      enable_shared=no
+      # So the build of libraries knows ...
+      target_configargs="${target_configargs} --disable-shared"
+      # So gcc knows ...
+      host_configargs="${host_configargs} --disable-shared"
+    fi
+    ;;
 esac
 
 # Makefile fragments.
@@ -8115,6 +10275,9 @@ done
 
 
 
+
+
+
 # Generate default definitions for YACC, M4, LEX and other programs that run
 # on the build machine.  These are used if the Makefile can't locate these
 # programs in objdir.
@@ -8947,6 +11110,147 @@ fi
 
 
 
+if test -n "$DSYMUTIL"; then
+  ac_cv_prog_DSYMUTIL=$DSYMUTIL
+elif test -n "$ac_cv_prog_DSYMUTIL"; then
+  DSYMUTIL=$ac_cv_prog_DSYMUTIL
+fi
+
+if test -n "$ac_cv_prog_DSYMUTIL"; then
+  for ncn_progname in dsymutil; do
+    # Extract the first word of "${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_DSYMUTIL+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$DSYMUTIL"; then
+  ac_cv_prog_DSYMUTIL="$DSYMUTIL" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_DSYMUTIL="${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+DSYMUTIL=$ac_cv_prog_DSYMUTIL
+if test -n "$DSYMUTIL"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $DSYMUTIL" >&5
+$as_echo "$DSYMUTIL" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  done
+fi
+
+for ncn_progname in dsymutil; do
+  if test -n "$ncn_tool_prefix"; then
+    # Extract the first word of "${ncn_tool_prefix}${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_tool_prefix}${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_DSYMUTIL+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$DSYMUTIL"; then
+  ac_cv_prog_DSYMUTIL="$DSYMUTIL" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_DSYMUTIL="${ncn_tool_prefix}${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+DSYMUTIL=$ac_cv_prog_DSYMUTIL
+if test -n "$DSYMUTIL"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $DSYMUTIL" >&5
+$as_echo "$DSYMUTIL" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  fi
+  if test -z "$ac_cv_prog_DSYMUTIL" && test $build = $host ; then
+    # Extract the first word of "${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_DSYMUTIL+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$DSYMUTIL"; then
+  ac_cv_prog_DSYMUTIL="$DSYMUTIL" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_DSYMUTIL="${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+DSYMUTIL=$ac_cv_prog_DSYMUTIL
+if test -n "$DSYMUTIL"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $DSYMUTIL" >&5
+$as_echo "$DSYMUTIL" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  fi
+  test -n "$ac_cv_prog_DSYMUTIL" && break
+done
+
+if test -z "$ac_cv_prog_DSYMUTIL" ; then
+  set dummy dsymutil
+  if test $build = $host ; then
+    DSYMUTIL="$2"
+  else
+    DSYMUTIL="${ncn_tool_prefix}$2"
+  fi
+fi
+
+
+
 if test -n "$LD"; then
   ac_cv_prog_LD=$LD
 elif test -n "$ac_cv_prog_LD"; then
@@ -9959,10 +12263,151 @@ IFS=$as_save_IFS
 
 fi
 fi
-OBJCOPY=$ac_cv_prog_OBJCOPY
-if test -n "$OBJCOPY"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJCOPY" >&5
-$as_echo "$OBJCOPY" >&6; }
+OBJCOPY=$ac_cv_prog_OBJCOPY
+if test -n "$OBJCOPY"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJCOPY" >&5
+$as_echo "$OBJCOPY" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  done
+fi
+
+for ncn_progname in objcopy; do
+  if test -n "$ncn_tool_prefix"; then
+    # Extract the first word of "${ncn_tool_prefix}${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_tool_prefix}${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_OBJCOPY+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$OBJCOPY"; then
+  ac_cv_prog_OBJCOPY="$OBJCOPY" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_OBJCOPY="${ncn_tool_prefix}${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+OBJCOPY=$ac_cv_prog_OBJCOPY
+if test -n "$OBJCOPY"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJCOPY" >&5
+$as_echo "$OBJCOPY" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  fi
+  if test -z "$ac_cv_prog_OBJCOPY" && test $build = $host ; then
+    # Extract the first word of "${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_OBJCOPY+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$OBJCOPY"; then
+  ac_cv_prog_OBJCOPY="$OBJCOPY" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_OBJCOPY="${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+OBJCOPY=$ac_cv_prog_OBJCOPY
+if test -n "$OBJCOPY"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJCOPY" >&5
+$as_echo "$OBJCOPY" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  fi
+  test -n "$ac_cv_prog_OBJCOPY" && break
+done
+
+if test -z "$ac_cv_prog_OBJCOPY" ; then
+  set dummy objcopy
+  if test $build = $host ; then
+    OBJCOPY="$2"
+  else
+    OBJCOPY="${ncn_tool_prefix}$2"
+  fi
+fi
+
+
+
+if test -n "$OBJDUMP"; then
+  ac_cv_prog_OBJDUMP=$OBJDUMP
+elif test -n "$ac_cv_prog_OBJDUMP"; then
+  OBJDUMP=$ac_cv_prog_OBJDUMP
+fi
+
+if test -n "$ac_cv_prog_OBJDUMP"; then
+  for ncn_progname in objdump; do
+    # Extract the first word of "${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_OBJDUMP+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$OBJDUMP"; then
+  ac_cv_prog_OBJDUMP="$OBJDUMP" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_OBJDUMP="${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+OBJDUMP=$ac_cv_prog_OBJDUMP
+if test -n "$OBJDUMP"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJDUMP" >&5
+$as_echo "$OBJDUMP" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -9972,17 +12417,17 @@ fi
   done
 fi
 
-for ncn_progname in objcopy; do
+for ncn_progname in objdump; do
   if test -n "$ncn_tool_prefix"; then
     # Extract the first word of "${ncn_tool_prefix}${ncn_progname}", so it can be a program name with args.
 set dummy ${ncn_tool_prefix}${ncn_progname}; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_OBJCOPY+:} false; then :
+if ${ac_cv_prog_OBJDUMP+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$OBJCOPY"; then
-  ac_cv_prog_OBJCOPY="$OBJCOPY" # Let the user override the test.
+  if test -n "$OBJDUMP"; then
+  ac_cv_prog_OBJDUMP="$OBJDUMP" # Let the user override the test.
 else
 as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
@@ -9991,7 +12436,7 @@ do
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
   if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_OBJCOPY="${ncn_tool_prefix}${ncn_progname}"
+    ac_cv_prog_OBJDUMP="${ncn_tool_prefix}${ncn_progname}"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -10001,10 +12446,10 @@ IFS=$as_save_IFS
 
 fi
 fi
-OBJCOPY=$ac_cv_prog_OBJCOPY
-if test -n "$OBJCOPY"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJCOPY" >&5
-$as_echo "$OBJCOPY" >&6; }
+OBJDUMP=$ac_cv_prog_OBJDUMP
+if test -n "$OBJDUMP"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJDUMP" >&5
+$as_echo "$OBJDUMP" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -10012,16 +12457,16 @@ fi
 
 
   fi
-  if test -z "$ac_cv_prog_OBJCOPY" && test $build = $host ; then
+  if test -z "$ac_cv_prog_OBJDUMP" && test $build = $host ; then
     # Extract the first word of "${ncn_progname}", so it can be a program name with args.
 set dummy ${ncn_progname}; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_OBJCOPY+:} false; then :
+if ${ac_cv_prog_OBJDUMP+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$OBJCOPY"; then
-  ac_cv_prog_OBJCOPY="$OBJCOPY" # Let the user override the test.
+  if test -n "$OBJDUMP"; then
+  ac_cv_prog_OBJDUMP="$OBJDUMP" # Let the user override the test.
 else
 as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
@@ -10030,7 +12475,7 @@ do
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
   if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_OBJCOPY="${ncn_progname}"
+    ac_cv_prog_OBJDUMP="${ncn_progname}"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -10040,10 +12485,10 @@ IFS=$as_save_IFS
 
 fi
 fi
-OBJCOPY=$ac_cv_prog_OBJCOPY
-if test -n "$OBJCOPY"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJCOPY" >&5
-$as_echo "$OBJCOPY" >&6; }
+OBJDUMP=$ac_cv_prog_OBJDUMP
+if test -n "$OBJDUMP"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJDUMP" >&5
+$as_echo "$OBJDUMP" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -10051,37 +12496,37 @@ fi
 
 
   fi
-  test -n "$ac_cv_prog_OBJCOPY" && break
+  test -n "$ac_cv_prog_OBJDUMP" && break
 done
 
-if test -z "$ac_cv_prog_OBJCOPY" ; then
-  set dummy objcopy
+if test -z "$ac_cv_prog_OBJDUMP" ; then
+  set dummy objdump
   if test $build = $host ; then
-    OBJCOPY="$2"
+    OBJDUMP="$2"
   else
-    OBJCOPY="${ncn_tool_prefix}$2"
+    OBJDUMP="${ncn_tool_prefix}$2"
   fi
 fi
 
 
 
-if test -n "$OBJDUMP"; then
-  ac_cv_prog_OBJDUMP=$OBJDUMP
-elif test -n "$ac_cv_prog_OBJDUMP"; then
-  OBJDUMP=$ac_cv_prog_OBJDUMP
+if test -n "$OTOOL"; then
+  ac_cv_prog_OTOOL=$OTOOL
+elif test -n "$ac_cv_prog_OTOOL"; then
+  OTOOL=$ac_cv_prog_OTOOL
 fi
 
-if test -n "$ac_cv_prog_OBJDUMP"; then
-  for ncn_progname in objdump; do
+if test -n "$ac_cv_prog_OTOOL"; then
+  for ncn_progname in otool; do
     # Extract the first word of "${ncn_progname}", so it can be a program name with args.
 set dummy ${ncn_progname}; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_OBJDUMP+:} false; then :
+if ${ac_cv_prog_OTOOL+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$OBJDUMP"; then
-  ac_cv_prog_OBJDUMP="$OBJDUMP" # Let the user override the test.
+  if test -n "$OTOOL"; then
+  ac_cv_prog_OTOOL="$OTOOL" # Let the user override the test.
 else
 as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
@@ -10090,7 +12535,7 @@ do
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
   if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_OBJDUMP="${ncn_progname}"
+    ac_cv_prog_OTOOL="${ncn_progname}"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -10100,10 +12545,10 @@ IFS=$as_save_IFS
 
 fi
 fi
-OBJDUMP=$ac_cv_prog_OBJDUMP
-if test -n "$OBJDUMP"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJDUMP" >&5
-$as_echo "$OBJDUMP" >&6; }
+OTOOL=$ac_cv_prog_OTOOL
+if test -n "$OTOOL"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OTOOL" >&5
+$as_echo "$OTOOL" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -10113,17 +12558,17 @@ fi
   done
 fi
 
-for ncn_progname in objdump; do
+for ncn_progname in otool; do
   if test -n "$ncn_tool_prefix"; then
     # Extract the first word of "${ncn_tool_prefix}${ncn_progname}", so it can be a program name with args.
 set dummy ${ncn_tool_prefix}${ncn_progname}; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_OBJDUMP+:} false; then :
+if ${ac_cv_prog_OTOOL+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$OBJDUMP"; then
-  ac_cv_prog_OBJDUMP="$OBJDUMP" # Let the user override the test.
+  if test -n "$OTOOL"; then
+  ac_cv_prog_OTOOL="$OTOOL" # Let the user override the test.
 else
 as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
@@ -10132,7 +12577,7 @@ do
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
   if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_OBJDUMP="${ncn_tool_prefix}${ncn_progname}"
+    ac_cv_prog_OTOOL="${ncn_tool_prefix}${ncn_progname}"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -10142,10 +12587,10 @@ IFS=$as_save_IFS
 
 fi
 fi
-OBJDUMP=$ac_cv_prog_OBJDUMP
-if test -n "$OBJDUMP"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJDUMP" >&5
-$as_echo "$OBJDUMP" >&6; }
+OTOOL=$ac_cv_prog_OTOOL
+if test -n "$OTOOL"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OTOOL" >&5
+$as_echo "$OTOOL" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -10153,16 +12598,16 @@ fi
 
 
   fi
-  if test -z "$ac_cv_prog_OBJDUMP" && test $build = $host ; then
+  if test -z "$ac_cv_prog_OTOOL" && test $build = $host ; then
     # Extract the first word of "${ncn_progname}", so it can be a program name with args.
 set dummy ${ncn_progname}; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_OBJDUMP+:} false; then :
+if ${ac_cv_prog_OTOOL+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$OBJDUMP"; then
-  ac_cv_prog_OBJDUMP="$OBJDUMP" # Let the user override the test.
+  if test -n "$OTOOL"; then
+  ac_cv_prog_OTOOL="$OTOOL" # Let the user override the test.
 else
 as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
@@ -10171,7 +12616,7 @@ do
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
   if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_OBJDUMP="${ncn_progname}"
+    ac_cv_prog_OTOOL="${ncn_progname}"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -10181,10 +12626,10 @@ IFS=$as_save_IFS
 
 fi
 fi
-OBJDUMP=$ac_cv_prog_OBJDUMP
-if test -n "$OBJDUMP"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OBJDUMP" >&5
-$as_echo "$OBJDUMP" >&6; }
+OTOOL=$ac_cv_prog_OTOOL
+if test -n "$OTOOL"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OTOOL" >&5
+$as_echo "$OTOOL" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -10192,15 +12637,15 @@ fi
 
 
   fi
-  test -n "$ac_cv_prog_OBJDUMP" && break
+  test -n "$ac_cv_prog_OTOOL" && break
 done
 
-if test -z "$ac_cv_prog_OBJDUMP" ; then
-  set dummy objdump
+if test -z "$ac_cv_prog_OTOOL" ; then
+  set dummy otool
   if test $build = $host ; then
-    OBJDUMP="$2"
+    OTOOL="$2"
   else
-    OBJDUMP="${ncn_tool_prefix}$2"
+    OTOOL="${ncn_tool_prefix}$2"
   fi
 fi
 
@@ -10351,6 +12796,7 @@ fi
 
 
 
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for -plugin option" >&5
 $as_echo_n "checking for -plugin option... " >&6; }
 
@@ -10487,10 +12933,6 @@ if test -n "$PLUGIN_OPTION"; then
   if $RANLIB --help 2>&1 | grep -q "\--plugin"; then
     RANLIB_PLUGIN_OPTION="$PLUGIN_OPTION"
   fi
-else
-  if test "$enable_pgo_build" != "no"; then
-    as_fn_error $? "AR with --plugin and rc is required for LTO build" "$LINENO" 5
-  fi
 fi
 
 
@@ -11066,8 +13508,169 @@ $as_echo_n "checking for $ac_word... " >&6; }
 if ${ac_cv_prog_GFORTRAN_FOR_TARGET+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$GFORTRAN_FOR_TARGET"; then
-  ac_cv_prog_GFORTRAN_FOR_TARGET="$GFORTRAN_FOR_TARGET" # Let the user override the test.
+  if test -n "$GFORTRAN_FOR_TARGET"; then
+  ac_cv_prog_GFORTRAN_FOR_TARGET="$GFORTRAN_FOR_TARGET" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_GFORTRAN_FOR_TARGET="${ncn_target_tool_prefix}${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+GFORTRAN_FOR_TARGET=$ac_cv_prog_GFORTRAN_FOR_TARGET
+if test -n "$GFORTRAN_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GFORTRAN_FOR_TARGET" >&5
+$as_echo "$GFORTRAN_FOR_TARGET" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+    fi
+    if test -z "$ac_cv_prog_GFORTRAN_FOR_TARGET" && test $build = $target ; then
+      # Extract the first word of "${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_GFORTRAN_FOR_TARGET+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$GFORTRAN_FOR_TARGET"; then
+  ac_cv_prog_GFORTRAN_FOR_TARGET="$GFORTRAN_FOR_TARGET" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_GFORTRAN_FOR_TARGET="${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+GFORTRAN_FOR_TARGET=$ac_cv_prog_GFORTRAN_FOR_TARGET
+if test -n "$GFORTRAN_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GFORTRAN_FOR_TARGET" >&5
+$as_echo "$GFORTRAN_FOR_TARGET" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+    fi
+    test -n "$ac_cv_prog_GFORTRAN_FOR_TARGET" && break
+  done
+fi
+
+if test -z "$ac_cv_prog_GFORTRAN_FOR_TARGET" ; then
+  set dummy gfortran
+  if test $build = $target ; then
+    GFORTRAN_FOR_TARGET="$2"
+  else
+    GFORTRAN_FOR_TARGET="${ncn_target_tool_prefix}$2"
+  fi
+else
+  GFORTRAN_FOR_TARGET="$ac_cv_prog_GFORTRAN_FOR_TARGET"
+fi
+
+
+
+if test -n "$GOC_FOR_TARGET"; then
+  ac_cv_prog_GOC_FOR_TARGET=$GOC_FOR_TARGET
+elif test -n "$ac_cv_prog_GOC_FOR_TARGET"; then
+  GOC_FOR_TARGET=$ac_cv_prog_GOC_FOR_TARGET
+fi
+
+if test -n "$ac_cv_prog_GOC_FOR_TARGET"; then
+  for ncn_progname in gccgo; do
+    # Extract the first word of "${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_GOC_FOR_TARGET+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$GOC_FOR_TARGET"; then
+  ac_cv_prog_GOC_FOR_TARGET="$GOC_FOR_TARGET" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_GOC_FOR_TARGET="${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+GOC_FOR_TARGET=$ac_cv_prog_GOC_FOR_TARGET
+if test -n "$GOC_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GOC_FOR_TARGET" >&5
+$as_echo "$GOC_FOR_TARGET" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  done
+fi
+
+if test -z "$ac_cv_prog_GOC_FOR_TARGET" && test -n "$with_build_time_tools"; then
+  for ncn_progname in gccgo; do
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ${ncn_progname} in $with_build_time_tools" >&5
+$as_echo_n "checking for ${ncn_progname} in $with_build_time_tools... " >&6; }
+    if test -x $with_build_time_tools/${ncn_progname}; then
+      ac_cv_prog_GOC_FOR_TARGET=$with_build_time_tools/${ncn_progname}
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+      break
+    else
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+    fi
+  done
+fi
+
+if test -z "$ac_cv_prog_GOC_FOR_TARGET"; then
+  for ncn_progname in gccgo; do
+    if test -n "$ncn_target_tool_prefix"; then
+      # Extract the first word of "${ncn_target_tool_prefix}${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_target_tool_prefix}${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_GOC_FOR_TARGET+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$GOC_FOR_TARGET"; then
+  ac_cv_prog_GOC_FOR_TARGET="$GOC_FOR_TARGET" # Let the user override the test.
 else
 as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
@@ -11076,7 +13679,7 @@ do
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
   if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_GFORTRAN_FOR_TARGET="${ncn_target_tool_prefix}${ncn_progname}"
+    ac_cv_prog_GOC_FOR_TARGET="${ncn_target_tool_prefix}${ncn_progname}"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -11086,10 +13689,10 @@ IFS=$as_save_IFS
 
 fi
 fi
-GFORTRAN_FOR_TARGET=$ac_cv_prog_GFORTRAN_FOR_TARGET
-if test -n "$GFORTRAN_FOR_TARGET"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GFORTRAN_FOR_TARGET" >&5
-$as_echo "$GFORTRAN_FOR_TARGET" >&6; }
+GOC_FOR_TARGET=$ac_cv_prog_GOC_FOR_TARGET
+if test -n "$GOC_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GOC_FOR_TARGET" >&5
+$as_echo "$GOC_FOR_TARGET" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -11097,16 +13700,16 @@ fi
 
 
     fi
-    if test -z "$ac_cv_prog_GFORTRAN_FOR_TARGET" && test $build = $target ; then
+    if test -z "$ac_cv_prog_GOC_FOR_TARGET" && test $build = $target ; then
       # Extract the first word of "${ncn_progname}", so it can be a program name with args.
 set dummy ${ncn_progname}; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_GFORTRAN_FOR_TARGET+:} false; then :
+if ${ac_cv_prog_GOC_FOR_TARGET+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$GFORTRAN_FOR_TARGET"; then
-  ac_cv_prog_GFORTRAN_FOR_TARGET="$GFORTRAN_FOR_TARGET" # Let the user override the test.
+  if test -n "$GOC_FOR_TARGET"; then
+  ac_cv_prog_GOC_FOR_TARGET="$GOC_FOR_TARGET" # Let the user override the test.
 else
 as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
@@ -11115,7 +13718,7 @@ do
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
   if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_GFORTRAN_FOR_TARGET="${ncn_progname}"
+    ac_cv_prog_GOC_FOR_TARGET="${ncn_progname}"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -11125,10 +13728,10 @@ IFS=$as_save_IFS
 
 fi
 fi
-GFORTRAN_FOR_TARGET=$ac_cv_prog_GFORTRAN_FOR_TARGET
-if test -n "$GFORTRAN_FOR_TARGET"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GFORTRAN_FOR_TARGET" >&5
-$as_echo "$GFORTRAN_FOR_TARGET" >&6; }
+GOC_FOR_TARGET=$ac_cv_prog_GOC_FOR_TARGET
+if test -n "$GOC_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GOC_FOR_TARGET" >&5
+$as_echo "$GOC_FOR_TARGET" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -11136,40 +13739,40 @@ fi
 
 
     fi
-    test -n "$ac_cv_prog_GFORTRAN_FOR_TARGET" && break
+    test -n "$ac_cv_prog_GOC_FOR_TARGET" && break
   done
 fi
 
-if test -z "$ac_cv_prog_GFORTRAN_FOR_TARGET" ; then
-  set dummy gfortran
+if test -z "$ac_cv_prog_GOC_FOR_TARGET" ; then
+  set dummy gccgo
   if test $build = $target ; then
-    GFORTRAN_FOR_TARGET="$2"
+    GOC_FOR_TARGET="$2"
   else
-    GFORTRAN_FOR_TARGET="${ncn_target_tool_prefix}$2"
+    GOC_FOR_TARGET="${ncn_target_tool_prefix}$2"
   fi
 else
-  GFORTRAN_FOR_TARGET="$ac_cv_prog_GFORTRAN_FOR_TARGET"
+  GOC_FOR_TARGET="$ac_cv_prog_GOC_FOR_TARGET"
 fi
 
 
 
-if test -n "$GOC_FOR_TARGET"; then
-  ac_cv_prog_GOC_FOR_TARGET=$GOC_FOR_TARGET
-elif test -n "$ac_cv_prog_GOC_FOR_TARGET"; then
-  GOC_FOR_TARGET=$ac_cv_prog_GOC_FOR_TARGET
+if test -n "$GDC_FOR_TARGET"; then
+  ac_cv_prog_GDC_FOR_TARGET=$GDC_FOR_TARGET
+elif test -n "$ac_cv_prog_GDC_FOR_TARGET"; then
+  GDC_FOR_TARGET=$ac_cv_prog_GDC_FOR_TARGET
 fi
 
-if test -n "$ac_cv_prog_GOC_FOR_TARGET"; then
-  for ncn_progname in gccgo; do
+if test -n "$ac_cv_prog_GDC_FOR_TARGET"; then
+  for ncn_progname in gdc; do
     # Extract the first word of "${ncn_progname}", so it can be a program name with args.
 set dummy ${ncn_progname}; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_GOC_FOR_TARGET+:} false; then :
+if ${ac_cv_prog_GDC_FOR_TARGET+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$GOC_FOR_TARGET"; then
-  ac_cv_prog_GOC_FOR_TARGET="$GOC_FOR_TARGET" # Let the user override the test.
+  if test -n "$GDC_FOR_TARGET"; then
+  ac_cv_prog_GDC_FOR_TARGET="$GDC_FOR_TARGET" # Let the user override the test.
 else
 as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
@@ -11178,7 +13781,7 @@ do
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
   if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_GOC_FOR_TARGET="${ncn_progname}"
+    ac_cv_prog_GDC_FOR_TARGET="${ncn_progname}"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -11188,10 +13791,10 @@ IFS=$as_save_IFS
 
 fi
 fi
-GOC_FOR_TARGET=$ac_cv_prog_GOC_FOR_TARGET
-if test -n "$GOC_FOR_TARGET"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GOC_FOR_TARGET" >&5
-$as_echo "$GOC_FOR_TARGET" >&6; }
+GDC_FOR_TARGET=$ac_cv_prog_GDC_FOR_TARGET
+if test -n "$GDC_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GDC_FOR_TARGET" >&5
+$as_echo "$GDC_FOR_TARGET" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -11201,12 +13804,12 @@ fi
   done
 fi
 
-if test -z "$ac_cv_prog_GOC_FOR_TARGET" && test -n "$with_build_time_tools"; then
-  for ncn_progname in gccgo; do
+if test -z "$ac_cv_prog_GDC_FOR_TARGET" && test -n "$with_build_time_tools"; then
+  for ncn_progname in gdc; do
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ${ncn_progname} in $with_build_time_tools" >&5
 $as_echo_n "checking for ${ncn_progname} in $with_build_time_tools... " >&6; }
     if test -x $with_build_time_tools/${ncn_progname}; then
-      ac_cv_prog_GOC_FOR_TARGET=$with_build_time_tools/${ncn_progname}
+      ac_cv_prog_GDC_FOR_TARGET=$with_build_time_tools/${ncn_progname}
       { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
       break
@@ -11217,18 +13820,18 @@ $as_echo "no" >&6; }
   done
 fi
 
-if test -z "$ac_cv_prog_GOC_FOR_TARGET"; then
-  for ncn_progname in gccgo; do
+if test -z "$ac_cv_prog_GDC_FOR_TARGET"; then
+  for ncn_progname in gdc; do
     if test -n "$ncn_target_tool_prefix"; then
       # Extract the first word of "${ncn_target_tool_prefix}${ncn_progname}", so it can be a program name with args.
 set dummy ${ncn_target_tool_prefix}${ncn_progname}; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_GOC_FOR_TARGET+:} false; then :
+if ${ac_cv_prog_GDC_FOR_TARGET+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$GOC_FOR_TARGET"; then
-  ac_cv_prog_GOC_FOR_TARGET="$GOC_FOR_TARGET" # Let the user override the test.
+  if test -n "$GDC_FOR_TARGET"; then
+  ac_cv_prog_GDC_FOR_TARGET="$GDC_FOR_TARGET" # Let the user override the test.
 else
 as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
@@ -11237,7 +13840,7 @@ do
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
   if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_GOC_FOR_TARGET="${ncn_target_tool_prefix}${ncn_progname}"
+    ac_cv_prog_GDC_FOR_TARGET="${ncn_target_tool_prefix}${ncn_progname}"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -11247,10 +13850,10 @@ IFS=$as_save_IFS
 
 fi
 fi
-GOC_FOR_TARGET=$ac_cv_prog_GOC_FOR_TARGET
-if test -n "$GOC_FOR_TARGET"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GOC_FOR_TARGET" >&5
-$as_echo "$GOC_FOR_TARGET" >&6; }
+GDC_FOR_TARGET=$ac_cv_prog_GDC_FOR_TARGET
+if test -n "$GDC_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GDC_FOR_TARGET" >&5
+$as_echo "$GDC_FOR_TARGET" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -11258,16 +13861,16 @@ fi
 
 
     fi
-    if test -z "$ac_cv_prog_GOC_FOR_TARGET" && test $build = $target ; then
+    if test -z "$ac_cv_prog_GDC_FOR_TARGET" && test $build = $target ; then
       # Extract the first word of "${ncn_progname}", so it can be a program name with args.
 set dummy ${ncn_progname}; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_GOC_FOR_TARGET+:} false; then :
+if ${ac_cv_prog_GDC_FOR_TARGET+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$GOC_FOR_TARGET"; then
-  ac_cv_prog_GOC_FOR_TARGET="$GOC_FOR_TARGET" # Let the user override the test.
+  if test -n "$GDC_FOR_TARGET"; then
+  ac_cv_prog_GDC_FOR_TARGET="$GDC_FOR_TARGET" # Let the user override the test.
 else
 as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
@@ -11276,7 +13879,7 @@ do
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
   if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_GOC_FOR_TARGET="${ncn_progname}"
+    ac_cv_prog_GDC_FOR_TARGET="${ncn_progname}"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -11286,10 +13889,10 @@ IFS=$as_save_IFS
 
 fi
 fi
-GOC_FOR_TARGET=$ac_cv_prog_GOC_FOR_TARGET
-if test -n "$GOC_FOR_TARGET"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GOC_FOR_TARGET" >&5
-$as_echo "$GOC_FOR_TARGET" >&6; }
+GDC_FOR_TARGET=$ac_cv_prog_GDC_FOR_TARGET
+if test -n "$GDC_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GDC_FOR_TARGET" >&5
+$as_echo "$GDC_FOR_TARGET" >&6; }
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -11297,19 +13900,19 @@ fi
 
 
     fi
-    test -n "$ac_cv_prog_GOC_FOR_TARGET" && break
+    test -n "$ac_cv_prog_GDC_FOR_TARGET" && break
   done
 fi
 
-if test -z "$ac_cv_prog_GOC_FOR_TARGET" ; then
-  set dummy gccgo
+if test -z "$ac_cv_prog_GDC_FOR_TARGET" ; then
+  set dummy gdc
   if test $build = $target ; then
-    GOC_FOR_TARGET="$2"
+    GDC_FOR_TARGET="$2"
   else
-    GOC_FOR_TARGET="${ncn_target_tool_prefix}$2"
+    GDC_FOR_TARGET="${ncn_target_tool_prefix}$2"
   fi
 else
-  GOC_FOR_TARGET="$ac_cv_prog_GOC_FOR_TARGET"
+  GDC_FOR_TARGET="$ac_cv_prog_GDC_FOR_TARGET"
 fi
 
 
@@ -11998,23 +14601,253 @@ fi
 
 
     fi
-    test -n "$ac_cv_prog_DLLTOOL_FOR_TARGET" && break
+    test -n "$ac_cv_prog_DLLTOOL_FOR_TARGET" && break
+  done
+fi
+
+if test -z "$ac_cv_prog_DLLTOOL_FOR_TARGET" ; then
+  set dummy dlltool
+  if test $build = $target ; then
+    DLLTOOL_FOR_TARGET="$2"
+  else
+    DLLTOOL_FOR_TARGET="${ncn_target_tool_prefix}$2"
+  fi
+else
+  DLLTOOL_FOR_TARGET="$ac_cv_prog_DLLTOOL_FOR_TARGET"
+fi
+
+else
+  DLLTOOL_FOR_TARGET=$ac_cv_path_DLLTOOL_FOR_TARGET
+fi
+
+
+
+
+if test -z "$ac_cv_path_DSYMUTIL_FOR_TARGET" ; then
+  if test -n "$with_build_time_tools"; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for dsymutil in $with_build_time_tools" >&5
+$as_echo_n "checking for dsymutil in $with_build_time_tools... " >&6; }
+    if test -x $with_build_time_tools/dsymutil; then
+      DSYMUTIL_FOR_TARGET=`cd $with_build_time_tools && pwd`/dsymutil
+      ac_cv_path_DSYMUTIL_FOR_TARGET=$DSYMUTIL_FOR_TARGET
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_DSYMUTIL_FOR_TARGET" >&5
+$as_echo "$ac_cv_path_DSYMUTIL_FOR_TARGET" >&6; }
+    else
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+    fi
+  elif test $build != $host && test $have_gcc_for_target = yes; then
+    DSYMUTIL_FOR_TARGET=`$GCC_FOR_TARGET --print-prog-name=dsymutil`
+    test $DSYMUTIL_FOR_TARGET = dsymutil && DSYMUTIL_FOR_TARGET=
+    test -n "$DSYMUTIL_FOR_TARGET" && ac_cv_path_DSYMUTIL_FOR_TARGET=$DSYMUTIL_FOR_TARGET
+  fi
+fi
+if test -z "$ac_cv_path_DSYMUTIL_FOR_TARGET" && test -n "$gcc_cv_tool_dirs"; then
+  # Extract the first word of "dsymutil", so it can be a program name with args.
+set dummy dsymutil; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_DSYMUTIL_FOR_TARGET+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $DSYMUTIL_FOR_TARGET in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_DSYMUTIL_FOR_TARGET="$DSYMUTIL_FOR_TARGET" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $gcc_cv_tool_dirs
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_DSYMUTIL_FOR_TARGET="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+DSYMUTIL_FOR_TARGET=$ac_cv_path_DSYMUTIL_FOR_TARGET
+if test -n "$DSYMUTIL_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $DSYMUTIL_FOR_TARGET" >&5
+$as_echo "$DSYMUTIL_FOR_TARGET" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+if test -z "$ac_cv_path_DSYMUTIL_FOR_TARGET" ; then
+
+
+if test -n "$DSYMUTIL_FOR_TARGET"; then
+  ac_cv_prog_DSYMUTIL_FOR_TARGET=$DSYMUTIL_FOR_TARGET
+elif test -n "$ac_cv_prog_DSYMUTIL_FOR_TARGET"; then
+  DSYMUTIL_FOR_TARGET=$ac_cv_prog_DSYMUTIL_FOR_TARGET
+fi
+
+if test -n "$ac_cv_prog_DSYMUTIL_FOR_TARGET"; then
+  for ncn_progname in dsymutil; do
+    # Extract the first word of "${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_DSYMUTIL_FOR_TARGET+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$DSYMUTIL_FOR_TARGET"; then
+  ac_cv_prog_DSYMUTIL_FOR_TARGET="$DSYMUTIL_FOR_TARGET" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_DSYMUTIL_FOR_TARGET="${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+DSYMUTIL_FOR_TARGET=$ac_cv_prog_DSYMUTIL_FOR_TARGET
+if test -n "$DSYMUTIL_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $DSYMUTIL_FOR_TARGET" >&5
+$as_echo "$DSYMUTIL_FOR_TARGET" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  done
+fi
+
+if test -z "$ac_cv_prog_DSYMUTIL_FOR_TARGET" && test -n "$with_build_time_tools"; then
+  for ncn_progname in dsymutil; do
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ${ncn_progname} in $with_build_time_tools" >&5
+$as_echo_n "checking for ${ncn_progname} in $with_build_time_tools... " >&6; }
+    if test -x $with_build_time_tools/${ncn_progname}; then
+      ac_cv_prog_DSYMUTIL_FOR_TARGET=$with_build_time_tools/${ncn_progname}
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+      break
+    else
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+    fi
+  done
+fi
+
+if test -z "$ac_cv_prog_DSYMUTIL_FOR_TARGET"; then
+  for ncn_progname in dsymutil; do
+    if test -n "$ncn_target_tool_prefix"; then
+      # Extract the first word of "${ncn_target_tool_prefix}${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_target_tool_prefix}${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_DSYMUTIL_FOR_TARGET+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$DSYMUTIL_FOR_TARGET"; then
+  ac_cv_prog_DSYMUTIL_FOR_TARGET="$DSYMUTIL_FOR_TARGET" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_DSYMUTIL_FOR_TARGET="${ncn_target_tool_prefix}${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+DSYMUTIL_FOR_TARGET=$ac_cv_prog_DSYMUTIL_FOR_TARGET
+if test -n "$DSYMUTIL_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $DSYMUTIL_FOR_TARGET" >&5
+$as_echo "$DSYMUTIL_FOR_TARGET" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+    fi
+    if test -z "$ac_cv_prog_DSYMUTIL_FOR_TARGET" && test $build = $target ; then
+      # Extract the first word of "${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_DSYMUTIL_FOR_TARGET+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$DSYMUTIL_FOR_TARGET"; then
+  ac_cv_prog_DSYMUTIL_FOR_TARGET="$DSYMUTIL_FOR_TARGET" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_DSYMUTIL_FOR_TARGET="${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+DSYMUTIL_FOR_TARGET=$ac_cv_prog_DSYMUTIL_FOR_TARGET
+if test -n "$DSYMUTIL_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $DSYMUTIL_FOR_TARGET" >&5
+$as_echo "$DSYMUTIL_FOR_TARGET" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+    fi
+    test -n "$ac_cv_prog_DSYMUTIL_FOR_TARGET" && break
   done
 fi
 
-if test -z "$ac_cv_prog_DLLTOOL_FOR_TARGET" ; then
-  set dummy dlltool
+if test -z "$ac_cv_prog_DSYMUTIL_FOR_TARGET" ; then
+  set dummy dsymutil
   if test $build = $target ; then
-    DLLTOOL_FOR_TARGET="$2"
+    DSYMUTIL_FOR_TARGET="$2"
   else
-    DLLTOOL_FOR_TARGET="${ncn_target_tool_prefix}$2"
+    DSYMUTIL_FOR_TARGET="${ncn_target_tool_prefix}$2"
   fi
 else
-  DLLTOOL_FOR_TARGET="$ac_cv_prog_DLLTOOL_FOR_TARGET"
+  DSYMUTIL_FOR_TARGET="$ac_cv_prog_DSYMUTIL_FOR_TARGET"
 fi
 
 else
-  DLLTOOL_FOR_TARGET=$ac_cv_path_DLLTOOL_FOR_TARGET
+  DSYMUTIL_FOR_TARGET=$ac_cv_path_DSYMUTIL_FOR_TARGET
 fi
 
 
@@ -13170,6 +16003,236 @@ fi
 
 
 
+if test -z "$ac_cv_path_OTOOL_FOR_TARGET" ; then
+  if test -n "$with_build_time_tools"; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for otool in $with_build_time_tools" >&5
+$as_echo_n "checking for otool in $with_build_time_tools... " >&6; }
+    if test -x $with_build_time_tools/otool; then
+      OTOOL_FOR_TARGET=`cd $with_build_time_tools && pwd`/otool
+      ac_cv_path_OTOOL_FOR_TARGET=$OTOOL_FOR_TARGET
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_OTOOL_FOR_TARGET" >&5
+$as_echo "$ac_cv_path_OTOOL_FOR_TARGET" >&6; }
+    else
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+    fi
+  elif test $build != $host && test $have_gcc_for_target = yes; then
+    OTOOL_FOR_TARGET=`$GCC_FOR_TARGET --print-prog-name=otool`
+    test $OTOOL_FOR_TARGET = otool && OTOOL_FOR_TARGET=
+    test -n "$OTOOL_FOR_TARGET" && ac_cv_path_OTOOL_FOR_TARGET=$OTOOL_FOR_TARGET
+  fi
+fi
+if test -z "$ac_cv_path_OTOOL_FOR_TARGET" && test -n "$gcc_cv_tool_dirs"; then
+  # Extract the first word of "otool", so it can be a program name with args.
+set dummy otool; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_OTOOL_FOR_TARGET+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $OTOOL_FOR_TARGET in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_OTOOL_FOR_TARGET="$OTOOL_FOR_TARGET" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $gcc_cv_tool_dirs
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_OTOOL_FOR_TARGET="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+OTOOL_FOR_TARGET=$ac_cv_path_OTOOL_FOR_TARGET
+if test -n "$OTOOL_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OTOOL_FOR_TARGET" >&5
+$as_echo "$OTOOL_FOR_TARGET" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+if test -z "$ac_cv_path_OTOOL_FOR_TARGET" ; then
+
+
+if test -n "$OTOOL_FOR_TARGET"; then
+  ac_cv_prog_OTOOL_FOR_TARGET=$OTOOL_FOR_TARGET
+elif test -n "$ac_cv_prog_OTOOL_FOR_TARGET"; then
+  OTOOL_FOR_TARGET=$ac_cv_prog_OTOOL_FOR_TARGET
+fi
+
+if test -n "$ac_cv_prog_OTOOL_FOR_TARGET"; then
+  for ncn_progname in otool; do
+    # Extract the first word of "${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_OTOOL_FOR_TARGET+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$OTOOL_FOR_TARGET"; then
+  ac_cv_prog_OTOOL_FOR_TARGET="$OTOOL_FOR_TARGET" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_OTOOL_FOR_TARGET="${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+OTOOL_FOR_TARGET=$ac_cv_prog_OTOOL_FOR_TARGET
+if test -n "$OTOOL_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OTOOL_FOR_TARGET" >&5
+$as_echo "$OTOOL_FOR_TARGET" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  done
+fi
+
+if test -z "$ac_cv_prog_OTOOL_FOR_TARGET" && test -n "$with_build_time_tools"; then
+  for ncn_progname in otool; do
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ${ncn_progname} in $with_build_time_tools" >&5
+$as_echo_n "checking for ${ncn_progname} in $with_build_time_tools... " >&6; }
+    if test -x $with_build_time_tools/${ncn_progname}; then
+      ac_cv_prog_OTOOL_FOR_TARGET=$with_build_time_tools/${ncn_progname}
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+      break
+    else
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+    fi
+  done
+fi
+
+if test -z "$ac_cv_prog_OTOOL_FOR_TARGET"; then
+  for ncn_progname in otool; do
+    if test -n "$ncn_target_tool_prefix"; then
+      # Extract the first word of "${ncn_target_tool_prefix}${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_target_tool_prefix}${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_OTOOL_FOR_TARGET+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$OTOOL_FOR_TARGET"; then
+  ac_cv_prog_OTOOL_FOR_TARGET="$OTOOL_FOR_TARGET" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_OTOOL_FOR_TARGET="${ncn_target_tool_prefix}${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+OTOOL_FOR_TARGET=$ac_cv_prog_OTOOL_FOR_TARGET
+if test -n "$OTOOL_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OTOOL_FOR_TARGET" >&5
+$as_echo "$OTOOL_FOR_TARGET" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+    fi
+    if test -z "$ac_cv_prog_OTOOL_FOR_TARGET" && test $build = $target ; then
+      # Extract the first word of "${ncn_progname}", so it can be a program name with args.
+set dummy ${ncn_progname}; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_OTOOL_FOR_TARGET+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$OTOOL_FOR_TARGET"; then
+  ac_cv_prog_OTOOL_FOR_TARGET="$OTOOL_FOR_TARGET" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_OTOOL_FOR_TARGET="${ncn_progname}"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+OTOOL_FOR_TARGET=$ac_cv_prog_OTOOL_FOR_TARGET
+if test -n "$OTOOL_FOR_TARGET"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $OTOOL_FOR_TARGET" >&5
+$as_echo "$OTOOL_FOR_TARGET" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+    fi
+    test -n "$ac_cv_prog_OTOOL_FOR_TARGET" && break
+  done
+fi
+
+if test -z "$ac_cv_prog_OTOOL_FOR_TARGET" ; then
+  set dummy otool
+  if test $build = $target ; then
+    OTOOL_FOR_TARGET="$2"
+  else
+    OTOOL_FOR_TARGET="${ncn_target_tool_prefix}$2"
+  fi
+else
+  OTOOL_FOR_TARGET="$ac_cv_prog_OTOOL_FOR_TARGET"
+fi
+
+else
+  OTOOL_FOR_TARGET=$ac_cv_path_OTOOL_FOR_TARGET
+fi
+
+
+
+
 if test -z "$ac_cv_path_RANLIB_FOR_TARGET" ; then
   if test -n "$with_build_time_tools"; then
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ranlib in $with_build_time_tools" >&5
@@ -14578,6 +17641,37 @@ $as_echo "pre-installed" >&6; }
   fi
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target dsymutil" >&5
+$as_echo_n "checking where to find the target dsymutil... " >&6; }
+if test "x${build}" != "x${host}" ; then
+  if expr "x$DSYMUTIL_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $DSYMUTIL_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  else
+    # Canadian cross, just use what we found
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+else
+  if expr "x$DSYMUTIL_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $DSYMUTIL_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  elif test "x$target" = "x$host"; then
+    # We can use an host tool
+    DSYMUTIL_FOR_TARGET='$(DSYMUTIL)'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: host tool" >&5
+$as_echo "host tool" >&6; }
+  else
+    # We need a cross tool
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+fi
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target gcc" >&5
 $as_echo_n "checking where to find the target gcc... " >&6; }
 if test "x${build}" != "x${host}" ; then
@@ -14710,6 +17804,51 @@ $as_echo "pre-installed" >&6; }
   fi
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target gdc" >&5
+$as_echo_n "checking where to find the target gdc... " >&6; }
+if test "x${build}" != "x${host}" ; then
+  if expr "x$GDC_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $GDC_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  else
+    # Canadian cross, just use what we found
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+else
+  ok=yes
+  case " ${configdirs} " in
+    *" gcc "*) ;;
+    *) ok=no ;;
+  esac
+  case ,${enable_languages}, in
+    *,d,*) ;;
+    *) ok=no ;;
+  esac
+  if test $ok = yes; then
+    # An in-tree tool is available and we can use it
+    GDC_FOR_TARGET='$$r/$(HOST_SUBDIR)/gcc/gdc -B$$r/$(HOST_SUBDIR)/gcc/'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: just compiled" >&5
+$as_echo "just compiled" >&6; }
+  elif expr "x$GDC_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $GDC_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  elif test "x$target" = "x$host"; then
+    # We can use an host tool
+    GDC_FOR_TARGET='$(GDC)'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: host tool" >&5
+$as_echo "host tool" >&6; }
+  else
+    # We need a cross tool
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+fi
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target ld" >&5
 $as_echo_n "checking where to find the target ld... " >&6; }
 if test "x${build}" != "x${host}" ; then
@@ -14909,6 +18048,37 @@ $as_echo "pre-installed" >&6; }
   fi
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target otool" >&5
+$as_echo_n "checking where to find the target otool... " >&6; }
+if test "x${build}" != "x${host}" ; then
+  if expr "x$OTOOL_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $OTOOL_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  else
+    # Canadian cross, just use what we found
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+else
+  if expr "x$OTOOL_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $OTOOL_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  elif test "x$target" = "x$host"; then
+    # We can use an host tool
+    OTOOL_FOR_TARGET='$(OTOOL)'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: host tool" >&5
+$as_echo "host tool" >&6; }
+  else
+    # We need a cross tool
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+fi
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target ranlib" >&5
 $as_echo_n "checking where to find the target ranlib... " >&6; }
 if test "x${build}" != "x${host}" ; then
@@ -15242,8 +18412,8 @@ fi
 compare_exclusions="gcc/cc*-checksum\$(objext) | gcc/ada/*tools/*"
 case "$target" in
   hppa*64*-*-hpux*) ;;
-  hppa*-*-hpux*) compare_exclusions="gcc/cc*-checksum\$(objext) | */libgcc/lib2funcs* | gcc/ada/*tools/* | gcc/function-tests.o" ;;
-  powerpc*-ibm-aix*) compare_exclusions="gcc/cc*-checksum\$(objext) | gcc/ada/*tools/* | *libgomp*\$(objext)" ;;
+  hppa*-*-hpux*) compare_exclusions="$compare_exclusions | */libgcc/lib2funcs* | gcc/function-tests.o" ;;
+  powerpc*-ibm-aix*) compare_exclusions="$compare_exclusions | *libgomp*\$(objext)" ;;
 esac
 
 

diff --git a/configure.ac b/configure.ac
index 0152c69292ed63addfe34131001a57ffc79cf60a..f9a224eb21f1471d0b50c440fc78c792d242da25 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 #   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
 #   2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012,
-#   2014, 2015, 2016, 2019, 2020 Free Software Foundation, Inc.
+#   2014, 2015, 2016, 2019, 2022 Free Software Foundation, Inc.
 #
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -24,6 +24,7 @@ m4_include(config/override.m4)
 m4_include(config/proginstall.m4)
 m4_include(config/elf.m4)
 m4_include(config/gcc-plugin.m4)
+m4_include(config/ax_cxx_compile_stdcxx.m4)
 m4_include([libtool.m4])
 m4_include([ltoptions.m4])
 m4_include([ltsugar.m4])
@@ -132,7 +133,7 @@ build_tools="build-texinfo build-flex build-bison build-m4 build-fixincludes"
 
 # these libraries are used by various programs built for the host environment
 #f
-host_libs="intl libiberty opcodes bfd readline tcl tk itcl libgui zlib libbacktrace libcpp libdecnumber gmp mpfr mpc isl libelf libiconv libctf"
+host_libs="intl libiberty opcodes bfd readline tcl tk itcl libgui zlib libbacktrace libcpp libcody libdecnumber gmp mpfr mpc isl libiconv libctf"
 
 # these tools are built for the host environment
 # Note, the powerpc-eabi build depends on sim occurring before gdb in order to
@@ -140,7 +141,7 @@ host_libs="intl libiberty opcodes bfd readline tcl tk itcl libgui zlib libbacktr
 # binutils, gas and ld appear in that order because it makes sense to run
 # "make check" in that particular order.
 # If --enable-gold is used, "gold" may replace "ld".
-host_tools="texinfo flex bison binutils gas ld fixincludes gcc cgen sid sim gdb gdbserver gprof etc expect dejagnu m4 utils guile fastjar gnattools libcc1 gotools"
+host_tools="texinfo flex bison binutils gas ld fixincludes gcc cgen sid sim gdb gdbserver gprof etc expect dejagnu m4 utils guile fastjar gnattools libcc1 gotools c++tools"
 
 # these libraries are built for the target environment, and are built after
 # the host libraries and the host tools (which may be a cross compiler)
@@ -151,7 +152,6 @@ target_libraries="target-libgcc \
                target-newlib \
                target-libgomp \
                target-liboffloadmic \
-               target-libhsail-rt \
                target-libatomic \
                target-libitm \
                target-libstdc++-v3 \
@@ -163,7 +163,9 @@ target_libraries="target-libgcc \
                target-libffi \
                target-libobjc \
                target-libada \
-               target-libgo"
+               target-libgo \
+               target-libphobos \
+               target-zlib"
 
 # these tools are built using the target libraries, and are intended to
 # run only in the target environment
@@ -249,12 +251,6 @@ fi
 AC_ARG_WITH(zstd,
 [AS_HELP_STRING([--with-zstd], [Support zstd compressed debug sections (default=auto)])])
 
-# Don't compile the bundled readline/libreadline.a if --with-system-readline
-# is provided.
-if test x$with_system_readline = xyes ; then
-  noconfigdirs="$noconfigdirs readline"
-fi
-
 # some tools are so dependent upon X11 that if we're not building with X, 
 # it's not even worth trying to configure, much less build, that tool.
 
@@ -307,6 +303,14 @@ AC_ARG_ENABLE(offload-targets,
   fi
 ], [enable_offload_targets=])
 
+AC_ARG_ENABLE(offload-defaulted,
+[AS_HELP_STRING([--enable-offload-defaulted]
+               [If enabled, configured but not installed offload compilers and
+               libgomp plugins are silently ignored.  Useful for distribution
+               compilers where those are in separate optional packages.])],
+[enable_offload_defaulted=$enableval],
+[enable_offload_defaulted=])
+
 # Handle --enable-gold, --enable-ld.
 # --disable-gold [--enable-ld]
 #     Build only ld.  Default option.
@@ -339,7 +343,7 @@ case "${ENABLE_GOLD}" in
       *-*-elf* | *-*-sysv4* | *-*-unixware* | *-*-eabi* | hppa*64*-*-hpux* \
       | *-*-linux* | *-*-gnu* | frv-*-uclinux* | *-*-irix5* | *-*-irix6* \
       | *-*-netbsd* | *-*-openbsd* | *-*-freebsd* | *-*-dragonfly* \
-      | *-*-solaris2* | *-*-nto* | *-*-nacl* | *-*-haiku*)
+      | *-*-solaris2* | *-*-nto* | *-*-nacl*)
         case "${target}" in
           *-*-linux*aout* | *-*-linux*oldld*)
             ;;
@@ -353,7 +357,7 @@ case "${ENABLE_GOLD}" in
       # Check for target supported by gold.
       case "${target}" in
         i?86-*-* | x86_64-*-* | sparc*-*-* | powerpc*-*-* | arm*-*-* \
-        | aarch64*-*-* | tilegx*-*-* | mips*-*-* | s390*-*-*)
+        | aarch64*-*-* | tilegx*-*-* | mips*-*-* | s390*-*-* | loongarch*-*-*)
          configdirs="$configdirs gold"
          if test x${ENABLE_GOLD} = xdefault; then
            default_ld=gold
@@ -546,7 +550,7 @@ if test x$enable_libgomp = x ; then
        ;;
     *-*-darwin* | *-*-aix*)
        ;;
-    nvptx*-*-*)
+    nvptx*-*-* | amdgcn*-*-*)
        ;;
     *)
        noconfigdirs="$noconfigdirs target-libgomp"
@@ -634,26 +638,6 @@ if test -d ${srcdir}/libvtv; then
     fi
 fi
 
-
-# Disable libhsail-rt on unsupported systems.
-if test -d ${srcdir}/libhsail-rt; then
-    if test x$enable_libhsail_rt = x; then
-        AC_MSG_CHECKING([for libhsail-rt support])
-        if (srcdir=${srcdir}/libhsail-rt; \
-                . ${srcdir}/configure.tgt; \
-                test -n "$UNSUPPORTED")
-        then
-            AC_MSG_RESULT([no])
-            unsupported_languages="$unsupported_languages brig"
-            # This implicitly disables also target-libhsail-rt as it won't
-            # get added to the build without BRIG FE.
-        else
-            AC_MSG_RESULT([yes])
-        fi
-    fi
-fi
-
-
 # Disable libquadmath for some systems.
 case "${target}" in
   avr-*-*)
@@ -672,9 +656,16 @@ case "${target}" in
     # No hosted I/O support.
     noconfigdirs="$noconfigdirs target-libssp"
     ;;
+  bpf-*-*)
+    noconfigdirs="$noconfigdirs target-libssp"
+    ;;
   powerpc-*-aix* | rs6000-*-aix*)
     noconfigdirs="$noconfigdirs target-libssp"
     ;;
+  pru-*-*)
+    # No hosted I/O support.
+    noconfigdirs="$noconfigdirs target-libssp"
+    ;;
   rl78-*-*)
     # libssp uses a misaligned load to trigger a fault, but the RL78
     # doesn't fault for those - instead, it gives a build-time error
@@ -688,13 +679,17 @@ case "${target}" in
 esac
 
 # Disable libstdc++-v3 for some systems.
-# Allow user to override this if they pass --enable-libstdc++-v3
+# Allow user to override this if they pass --enable-libstdcxx
 if test "${ENABLE_LIBSTDCXX}" = "default" ; then
   case "${target}" in
     *-*-vxworks*)
       # VxWorks uses the Dinkumware C++ library.
       noconfigdirs="$noconfigdirs target-libstdc++-v3"
       ;;
+    amdgcn*-*-*)
+      # Not ported/fails to build when using newlib.
+      noconfigdirs="$noconfigdirs target-libstdc++-v3"
+      ;;
     arm*-wince-pe*)
       # the C++ libraries don't build on top of CE's C libraries
       noconfigdirs="$noconfigdirs target-libstdc++-v3"
@@ -702,18 +697,83 @@ if test "${ENABLE_LIBSTDCXX}" = "default" ; then
     avr-*-*)
       noconfigdirs="$noconfigdirs target-libstdc++-v3"
       ;;
+    bpf-*-*)
+      noconfigdirs="$noconfigdirs target-libstdc++-v3"
+      ;;
     ft32-*-*)
       noconfigdirs="$noconfigdirs target-libstdc++-v3"
       ;;
   esac
 fi
 
+# Disable C++ on systems where it is known to not work.
+# For testing, you can override this with --enable-languages=c++.
+case ,${enable_languages}, in
+  *,c++,*)
+    ;;
+  *)
+      case "${target}" in
+        bpf-*-*)
+          unsupported_languages="$unsupported_languages c++"
+          ;;
+      esac
+      ;;
+esac
+
+# Disable Objc on systems where it is known to not work.
+# For testing, you can override this with --enable-languages=objc.
+case ,${enable_languages}, in
+  *,objc,*)
+    ;;
+  *)
+      case "${target}" in
+        bpf-*-*)
+          unsupported_languages="$unsupported_languages objc"
+          ;;
+      esac
+      ;;
+esac
+
+# Disable D on systems where it is known to not work.
+# For testing, you can override this with --enable-languages=d.
+case ,${enable_languages}, in
+  *,d,*)
+    ;;
+  *)
+    case "${target}" in
+      bpf-*-*)
+       unsupported_languages="$unsupported_languages d"
+       ;;
+    esac
+    ;;
+esac
+
+# Disable libphobos on unsupported systems.
+# For testing, you can override this with --enable-libphobos.
+if test -d ${srcdir}/libphobos; then
+    if test x$enable_libphobos = x; then
+       AC_MSG_CHECKING([for libphobos support])
+       if (srcdir=${srcdir}/libphobos; \
+               . ${srcdir}/configure.tgt; \
+               test "$LIBPHOBOS_SUPPORTED" != "yes")
+       then
+           AC_MSG_RESULT([no])
+           noconfigdirs="$noconfigdirs target-libphobos"
+       else
+           AC_MSG_RESULT([yes])
+       fi
+    fi
+fi
+
 # Disable Fortran for some systems.
 case "${target}" in
   mmix-*-*)
     # See <http://gcc.gnu.org/ml/gcc-patches/2004-11/msg00572.html>.
     unsupported_languages="$unsupported_languages fortran"
     ;;
+  bpf-*-*)
+    unsupported_languages="$unsupported_languages fortran"
+    ;;
 esac
 
 # Disable libffi for some systems.
@@ -757,6 +817,12 @@ case "${target}" in
   arm-wince-pe)
     noconfigdirs="$noconfigdirs target-libffi"
     ;;
+  arm*-*-symbianelf*)
+    noconfigdirs="$noconfigdirs target-libffi"
+    ;;
+  bpf-*-*)
+    noconfigdirs="$noconfigdirs target-libffi"
+    ;;
   cris-*-* | crisv32-*-*)
     case "${target}" in
       *-*-linux*)
@@ -803,7 +869,7 @@ esac
 # Disable the go frontend on systems where it is known to not work. Please keep
 # this in sync with contrib/config-list.mk.
 case "${target}" in
-*-*-darwin* | *-*-cygwin* | *-*-mingw*)
+*-*-darwin* | *-*-cygwin* | *-*-mingw* | bpf-* )
     unsupported_languages="$unsupported_languages go"
     ;;
 esac
@@ -835,6 +901,9 @@ if test x$enable_libgo = x; then
     *-*-cygwin* | *-*-mingw*)
        noconfigdirs="$noconfigdirs target-libgo"
        ;;
+    bpf-*-*)
+        noconfigdirs="$noconfigdirs target-libgo"
+        ;;
     esac
 fi
 
@@ -860,6 +929,9 @@ case "${target}" in
   i[[3456789]]86-*-*)
     libgloss_dir=i386
     ;;
+  loongarch*-*-*)
+    libgloss_dir=loongarch
+    ;;
   m68hc11-*-*|m6811-*-*|m68hc12-*-*|m6812-*-*)
     libgloss_dir=m68hc11
     ;;
@@ -872,6 +944,9 @@ case "${target}" in
   powerpc*-*-*)
     libgloss_dir=rs6000
     ;;
+  pru-*-*)
+    libgloss_dir=pru
+    ;;
   sparc*-*-*)
     libgloss_dir=sparc
     ;;
@@ -903,6 +978,9 @@ case "${target}" in
   sparc-*-sunos4*)
     noconfigdirs="$noconfigdirs target-newlib target-libgloss"
     ;;
+  bpf-*-*)
+    noconfigdirs="$noconfigdirs target-newlib target-libgloss"
+    ;;
   *-*-aix*)
     noconfigdirs="$noconfigdirs target-newlib target-libgloss"
     ;;
@@ -951,6 +1029,8 @@ case "${target}" in
     noconfigdirs="$noconfigdirs ld gas gdb gprof"
     noconfigdirs="$noconfigdirs sim target-rda"
     ;;
+  amdgcn*-*-*)
+    ;;
   arm-*-darwin*)
     noconfigdirs="$noconfigdirs ld gas gdb gprof"
     noconfigdirs="$noconfigdirs sim target-rda"
@@ -974,7 +1054,8 @@ case "${target}" in
   *-*-dragonfly*)
     ;;
   *-*-freebsd*)
-    if test "x$with_gmp" = x && test "x$with_gmp_dir" = x \
+    if test "x$with_gmp" = x \
+       && ! test -d ${srcdir}/gmp \
        && test -f /usr/local/include/gmp.h; then
       with_gmp=/usr/local
     fi
@@ -1014,6 +1095,9 @@ case "${target}" in
     # newlib is not 64 bit ready
     noconfigdirs="$noconfigdirs target-newlib target-libgloss"
     ;;
+  bpf-*-*)
+    noconfigdirs="$noconfigdirs target-libobjc target-libbacktrace"
+    ;;
   sh*-*-pe|mips*-*-pe|*arm-wince-pe)
     noconfigdirs="$noconfigdirs tcl tk itcl libgui sim"
     ;;
@@ -1232,6 +1316,11 @@ case "${target}" in
   wasm32-*-*)
     noconfigdirs="$noconfigdirs ld"
     ;;
+  loongarch*-*-linux*)
+    ;;
+  loongarch*-*-*)
+    noconfigdirs="$noconfigdirs gprof"
+    ;;
 esac
 
 # If we aren't building newlib, then don't build libgloss, since libgloss
@@ -1267,7 +1356,7 @@ case "${host}" in
   hppa*-*)     
     host_makefile_frag="config/mh-pa"
     ;;
-  *-*-darwin*)
+  i?86-*-darwin[[89]]* | i?86-*-darwin1[[0-7]]* | powerpc*-*-darwin*)
     host_makefile_frag="config/mh-darwin"
     ;;
   powerpc-*-aix*)
@@ -1283,9 +1372,12 @@ if test "${build}" != "${host}" ; then
   AR_FOR_BUILD=${AR_FOR_BUILD-ar}
   AS_FOR_BUILD=${AS_FOR_BUILD-as}
   CC_FOR_BUILD=${CC_FOR_BUILD-gcc}
+  CPP_FOR_BUILD="${CPP_FOR_BUILD-\$(CC_FOR_BUILD) -E}"
   CXX_FOR_BUILD=${CXX_FOR_BUILD-g++}
+  DSYMUTIL_FOR_BUILD=${DSYMUTIL_FOR_BUILD-dsymutil}
   GFORTRAN_FOR_BUILD=${GFORTRAN_FOR_BUILD-gfortran}
   GOC_FOR_BUILD=${GOC_FOR_BUILD-gccgo}
+  GDC_FOR_BUILD=${GDC_FOR_BUILD-gdc}
   DLLTOOL_FOR_BUILD=${DLLTOOL_FOR_BUILD-dlltool}
   LD_FOR_BUILD=${LD_FOR_BUILD-ld}
   NM_FOR_BUILD=${NM_FOR_BUILD-nm}
@@ -1297,8 +1389,10 @@ else
   AS_FOR_BUILD="\$(AS)"
   CC_FOR_BUILD="\$(CC)"
   CXX_FOR_BUILD="\$(CXX)"
+  DSYMUTIL_FOR_BUILD="\$(DSYMUTIL)"
   GFORTRAN_FOR_BUILD="\$(GFORTRAN)"
   GOC_FOR_BUILD="\$(GOC)"
+  GDC_FOR_BUILD="\$(GDC)"
   DLLTOOL_FOR_BUILD="\$(DLLTOOL)"
   LD_FOR_BUILD="\$(LD)"
   NM_FOR_BUILD="\$(NM)"
@@ -1350,6 +1444,7 @@ int main() {}])],
 fi
 
 ACX_PROG_GNAT
+ACX_PROG_GDC
 ACX_PROG_CMP_IGNORE_INITIAL
 
 AC_ARG_ENABLE([bootstrap],
@@ -1395,10 +1490,17 @@ case "$have_compiler:$host:$target:$enable_bootstrap" in
     ;;
 esac
 
-# When bootstrapping with GCC, build stage 1 in C++98 mode to ensure that a
-# C++98 compiler can still start the bootstrap.
+# When bootstrapping with GCC, build stage 1 in C++11 mode to ensure that a
+# C++11 compiler can still start the bootstrap.  Otherwise, if building GCC,
+# require C++11 (or higher).
 if test "$enable_bootstrap:$GXX" = "yes:yes"; then
-  CXX="$CXX -std=gnu++98"
+  CXX="$CXX -std=c++11"
+elif test "$have_compiler" = yes; then
+  AX_CXX_COMPILE_STDCXX(11)
+
+  if test "${build}" != "${host}"; then
+    AX_CXX_COMPILE_STDCXX(11, [], [], [_FOR_BUILD])
+  fi
 fi
 
 AC_ARG_ENABLE([pgo-build],
@@ -1504,11 +1606,6 @@ fi
 
 # Specify a location for mpfr
 # check for this first so it ends up on the link line before gmp.
-AC_ARG_WITH(mpfr-dir,
-[AS_HELP_STRING([--with-mpfr-dir=PATH], [this option has been REMOVED])],
-[AC_MSG_ERROR([The --with-mpfr-dir=PATH option has been removed.
-Use --with-mpfr=PATH or --with-mpfr-include=PATH plus --with-mpfr-lib=PATH])])
-
 AC_ARG_WITH(mpfr,
 [AS_HELP_STRING([--with-mpfr=PATH],
                [specify prefix directory for installed MPFR package.
@@ -1548,11 +1645,6 @@ Building GCC with MPFR in the source tree is only handled for MPFR 3.1.0+.])
 fi
 
 # Specify a location for gmp
-AC_ARG_WITH(gmp-dir,
-[AS_HELP_STRING([--with-gmp-dir=PATH], [this option has been REMOVED])],
-[AC_MSG_ERROR([The --with-gmp-dir=PATH option has been removed.
-Use --with-gmp=PATH or --with-gmp-include=PATH plus --with-gmp-lib=PATH])])
-
 AC_ARG_WITH(gmp,
 [AS_HELP_STRING([--with-gmp=PATH],
                [specify prefix directory for the installed GMP package.
@@ -1616,12 +1708,12 @@ if test -d ${srcdir}/gcc && test "x$have_gmp" = xno; then
     AC_MSG_CHECKING([for the correct version of mpfr.h])
     AC_TRY_COMPILE([#include <gmp.h>
     #include <mpfr.h>],[
-    #if MPFR_VERSION < MPFR_VERSION_NUM(2,4,0)
+    #if MPFR_VERSION < MPFR_VERSION_NUM(3,1,0)
     choke me
     #endif
     ], [AC_TRY_COMPILE([#include <gmp.h>
     #include <mpfr.h>],[
-    #if MPFR_VERSION < MPFR_VERSION_NUM(2,4,2)
+    #if MPFR_VERSION < MPFR_VERSION_NUM(3,1,6)
     choke me
     #endif
     ], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([buggy but acceptable])])],
@@ -1656,9 +1748,9 @@ if test -d ${srcdir}/gcc && test "x$have_gmp" = xno; then
     int t;
     mpfr_init (n);
     mpfr_init (x);
-    mpfr_atan2 (n, n, x, GMP_RNDN);
-    mpfr_erfc (n, x, GMP_RNDN);
-    mpfr_subnormalize (x, t, GMP_RNDN);
+    mpfr_atan2 (n, n, x, MPFR_RNDN);
+    mpfr_erfc (n, x, MPFR_RNDN);
+    mpfr_subnormalize (x, t, MPFR_RNDN);
     mpfr_clear(n);
     mpfr_clear(x);
     mpc_init2 (c, 53);
@@ -1676,11 +1768,11 @@ if test -d ${srcdir}/gcc && test "x$have_gmp" = xno; then
 # The library versions listed in the error message below should match
 # the HARD-minimums enforced above.
   if test x$have_gmp != xyes; then
-    AC_MSG_ERROR([Building GCC requires GMP 4.2+, MPFR 2.4.0+ and MPC 0.8.0+.
+    AC_MSG_ERROR([Building GCC requires GMP 4.2+, MPFR 3.1.0+ and MPC 0.8.0+.
 Try the --with-gmp, --with-mpfr and/or --with-mpc options to specify
 their locations.  Source code for these libraries can be found at
 their respective hosting sites as well as at
-ftp://gcc.gnu.org/pub/gcc/infrastructure/.  See also
+https://gcc.gnu.org/pub/gcc/infrastructure/.  See also
 http://gcc.gnu.org/install/prerequisites.html for additional info.  If
 you obtained GMP, MPFR and/or MPC from a vendor distribution package,
 make sure that you have installed both the libraries and the header
@@ -1855,7 +1947,20 @@ AC_SUBST(extra_linker_plugin_flags)
 AC_ARG_ENABLE(host-shared,
 [AS_HELP_STRING([--enable-host-shared],
                [build host code as shared libraries])],
-[host_shared=$enableval], [host_shared=no])
+[host_shared=$enableval
+ case $host in
+   x86_64-*-darwin* | aarch64-*-darwin*)
+     if test x$host_shared != xyes ; then
+       # PIC is the default, and actually cannot be switched off.
+       echo configure.ac: warning: PIC code is required for the configured target, host-shared setting ignored. 1>&2
+       host_shared=yes
+     fi ;;
+  *) ;;
+ esac],
+[case $host in
+  x86_64-*-darwin* | aarch64-*-darwin*) host_shared=yes ;;
+  *) host_shared=no ;;
+ esac])
 AC_SUBST(host_shared)
 
 # By default, C and C++ are the only stage 1 languages.
@@ -2070,10 +2175,31 @@ if test -d ${srcdir}/gcc; then
             ;;
         esac
 
+        # Disable D if no preexisting GDC is available.
+        case ${add_this_lang}:${language}:${have_gdc} in
+          yes:d:no)
+            # Specifically requested language; tell them.
+            AC_MSG_ERROR([GDC is required to build $language])
+           ;;
+          all:d:no)
+            AC_MSG_WARN([GDC is required to build $language])
+            add_this_lang=unsupported
+            ;;
+          *:d:no)
+            # Silently disable.
+            add_this_lang=unsupported
+            ;;
+        esac
+
         # Disable jit if -enable-host-shared not specified
-        case ${add_this_lang}:${language}:${host_shared} in
-          yes:jit:no)
-           # PR jit/64780: explicitly specify --enable-host-shared
+        # but not if building for Mingw. All code in Windows
+        # is position independent code (PIC).
+        case $target in
+          *mingw*) ;;
+          *)
+          case ${add_this_lang}:${language}:${host_shared} in
+            yes:jit:no)
+                  # PR jit/64780: explicitly specify --enable-host-shared
            AC_MSG_ERROR([
 Enabling language "jit" requires --enable-host-shared.
 
@@ -2084,16 +2210,18 @@ If you want to build both the jit and the regular compiler, it is often
 best to do this via two separate configure/builds, in separate
 directories, to avoid imposing the performance cost of
 --enable-host-shared on the regular compiler.])
-           ;;
-          all:jit:no)
-           AC_MSG_WARN([--enable-host-shared required to build $language])
-            add_this_lang=unsupported
-            ;;
-          *:jit:no)
-            # Silently disable.
-            add_this_lang=unsupported
-            ;;
-       esac
+                   ;;
+            all:jit:no)
+             AC_MSG_WARN([--enable-host-shared required to build $language])
+              add_this_lang=unsupported
+              ;;
+            *:jit:no)
+              # Silently disable.
+              add_this_lang=unsupported
+              ;;
+               esac
+          ;;
+        esac
 
         # Disable a language that is unsupported by the target.
        case "${add_this_lang}: $unsupported_languages " in
@@ -2130,7 +2258,7 @@ directories, to avoid imposing the performance cost of
                  *) stage1_languages="${stage1_languages}${language}," ;;
                esac
                # We need to bootstrap any supporting libraries.
-               bootstrap_target_libs="${bootstrap_target_libs}${target_libs},"
+               bootstrap_target_libs=`echo "${bootstrap_target_libs}${target_libs}," | sed "s/ /,/g"`
                ;;
            esac
            ;;
@@ -2804,7 +2932,7 @@ fi
 # or bootstrap-ubsan, bootstrap it.
 if echo " ${target_configdirs} " | grep " libsanitizer " > /dev/null 2>&1; then
   case "$BUILD_CONFIG" in
-    *bootstrap-asan* | *bootstrap-ubsan* )
+    *bootstrap-hwasan* | *bootstrap-asan* | *bootstrap-ubsan* )
       bootstrap_target_libs=${bootstrap_target_libs}target-libsanitizer,
       bootstrap_fixincludes=yes
       ;;
@@ -2817,6 +2945,16 @@ if echo " ${target_configdirs} " | grep " libvtv " > /dev/null 2>&1 &&
   bootstrap_target_libs=${bootstrap_target_libs}target-libvtv,
 fi
 
+# If we are building libatomic and the list of enabled languages includes the
+# D frontend, bootstrap it.
+if echo " ${target_configdirs} " | grep " libatomic " > /dev/null 2>&1; then
+  case ,${enable_languages}, in
+    *,d,*)
+      bootstrap_target_libs=${bootstrap_target_libs}target-libatomic,
+      ;;
+  esac
+fi
+
 # Determine whether gdb needs tk/tcl or not.
 # Use 'maybe' since enable_gdbtk might be true even if tk isn't available
 # and in that case we want gdb to be built without tk.  Ugh!
@@ -3354,6 +3492,17 @@ case "${target}" in
   mep*)
     FLAGS_FOR_TARGET="$FLAGS_FOR_TARGET -mlibrary"
     ;;
+  # The VxWorks support for shared libraries is getting in
+  # incrementally.  Make sure it doesn't get activated implicitly:
+  *vxworks*)
+    if test "${enable_shared-unset}" = unset ; then
+      enable_shared=no
+      # So the build of libraries knows ...
+      target_configargs="${target_configargs} --disable-shared"
+      # So gcc knows ...
+      host_configargs="${host_configargs} --disable-shared"
+    fi
+    ;;
 esac
 
 # Makefile fragments.
@@ -3396,12 +3545,15 @@ AC_SUBST(AR_FOR_BUILD)
 AC_SUBST(AS_FOR_BUILD)
 AC_SUBST(CC_FOR_BUILD)
 AC_SUBST(CFLAGS_FOR_BUILD)
+AC_SUBST(CPP_FOR_BUILD)
 AC_SUBST(CPPFLAGS_FOR_BUILD)
 AC_SUBST(CXXFLAGS_FOR_BUILD)
 AC_SUBST(CXX_FOR_BUILD)
 AC_SUBST(DLLTOOL_FOR_BUILD)
+AC_SUBST(DSYMUTIL_FOR_BUILD)
 AC_SUBST(GFORTRAN_FOR_BUILD)
 AC_SUBST(GOC_FOR_BUILD)
+AC_SUBST(GDC_FOR_BUILD)
 AC_SUBST(LDFLAGS_FOR_BUILD)
 AC_SUBST(LD_FOR_BUILD)
 AC_SUBST(NM_FOR_BUILD)
@@ -3478,6 +3630,7 @@ esac
 NCN_STRICT_CHECK_TOOLS(AR, ar)
 NCN_STRICT_CHECK_TOOLS(AS, as)
 NCN_STRICT_CHECK_TOOLS(DLLTOOL, dlltool)
+NCN_STRICT_CHECK_TOOLS(DSYMUTIL, dsymutil)
 NCN_STRICT_CHECK_TOOLS(LD, ld)
 NCN_STRICT_CHECK_TOOLS(LIPO, lipo)
 NCN_STRICT_CHECK_TOOLS(NM, nm)
@@ -3487,12 +3640,14 @@ NCN_STRICT_CHECK_TOOLS(WINDRES, windres)
 NCN_STRICT_CHECK_TOOLS(WINDMC, windmc)
 NCN_STRICT_CHECK_TOOLS(OBJCOPY, objcopy)
 NCN_STRICT_CHECK_TOOLS(OBJDUMP, objdump)
+NCN_STRICT_CHECK_TOOLS(OTOOL, otool)
 NCN_STRICT_CHECK_TOOLS(READELF, readelf)
 AC_SUBST(CC)
 AC_SUBST(CXX)
 AC_SUBST(CFLAGS)
 AC_SUBST(CXXFLAGS)
-AC_SUBST(PKG_CONFIG_PATH)
+AC_SUBST(GDC)
+AC_SUBST(GDCFLAGS)
 
 GCC_PLUGIN_OPTION(PLUGIN_OPTION)
 AR_PLUGIN_OPTION=
@@ -3504,10 +3659,6 @@ if test -n "$PLUGIN_OPTION"; then
   if $RANLIB --help 2>&1 | grep -q "\--plugin"; then
     RANLIB_PLUGIN_OPTION="$PLUGIN_OPTION"
   fi
-else
-  if test "$enable_pgo_build" != "no"; then
-    AC_MSG_ERROR([AR with --plugin and rc is required for LTO build])
-  fi
 fi
 AC_SUBST(AR_PLUGIN_OPTION)
 AC_SUBST(RANLIB_PLUGIN_OPTION)
@@ -3530,15 +3681,18 @@ NCN_STRICT_CHECK_TARGET_TOOLS(CXX_FOR_TARGET, c++ g++ cxx gxx)
 NCN_STRICT_CHECK_TARGET_TOOLS(GCC_FOR_TARGET, gcc, ${CC_FOR_TARGET})
 NCN_STRICT_CHECK_TARGET_TOOLS(GFORTRAN_FOR_TARGET, gfortran)
 NCN_STRICT_CHECK_TARGET_TOOLS(GOC_FOR_TARGET, gccgo)
+NCN_STRICT_CHECK_TARGET_TOOLS(GDC_FOR_TARGET, gdc)
 
 ACX_CHECK_INSTALLED_TARGET_TOOL(AR_FOR_TARGET, ar)
 ACX_CHECK_INSTALLED_TARGET_TOOL(AS_FOR_TARGET, as)
 ACX_CHECK_INSTALLED_TARGET_TOOL(DLLTOOL_FOR_TARGET, dlltool)
+ACX_CHECK_INSTALLED_TARGET_TOOL(DSYMUTIL_FOR_TARGET, dsymutil)
 ACX_CHECK_INSTALLED_TARGET_TOOL(LD_FOR_TARGET, ld)
 ACX_CHECK_INSTALLED_TARGET_TOOL(LIPO_FOR_TARGET, lipo)
 ACX_CHECK_INSTALLED_TARGET_TOOL(NM_FOR_TARGET, nm)
 ACX_CHECK_INSTALLED_TARGET_TOOL(OBJCOPY_FOR_TARGET, objcopy)
 ACX_CHECK_INSTALLED_TARGET_TOOL(OBJDUMP_FOR_TARGET, objdump)
+ACX_CHECK_INSTALLED_TARGET_TOOL(OTOOL_FOR_TARGET, otool)
 ACX_CHECK_INSTALLED_TARGET_TOOL(RANLIB_FOR_TARGET, ranlib)
 ACX_CHECK_INSTALLED_TARGET_TOOL(READELF_FOR_TARGET, readelf)
 ACX_CHECK_INSTALLED_TARGET_TOOL(STRIP_FOR_TARGET, strip)
@@ -3558,16 +3712,20 @@ GCC_TARGET_TOOL(c++ for libstdc++, RAW_CXX_FOR_TARGET, CXX,
                [gcc/xgcc -shared-libgcc -B$$r/$(HOST_SUBDIR)/gcc -nostdinc++ -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs],
                c++)
 GCC_TARGET_TOOL(dlltool, DLLTOOL_FOR_TARGET, DLLTOOL, [binutils/dlltool])
+GCC_TARGET_TOOL(dsymutil, DSYMUTIL_FOR_TARGET, DSYMUTIL)
 GCC_TARGET_TOOL(gcc, GCC_FOR_TARGET, , [gcc/xgcc -B$$r/$(HOST_SUBDIR)/gcc/])
 GCC_TARGET_TOOL(gfortran, GFORTRAN_FOR_TARGET, GFORTRAN,
                [gcc/gfortran -B$$r/$(HOST_SUBDIR)/gcc/], fortran)
 GCC_TARGET_TOOL(gccgo, GOC_FOR_TARGET, GOC,
                [gcc/gccgo -B$$r/$(HOST_SUBDIR)/gcc/], go)
+GCC_TARGET_TOOL(gdc, GDC_FOR_TARGET, GDC,
+               [gcc/gdc -B$$r/$(HOST_SUBDIR)/gcc/], d)
 GCC_TARGET_TOOL(ld, LD_FOR_TARGET, LD, [ld/ld-new])
 GCC_TARGET_TOOL(lipo, LIPO_FOR_TARGET, LIPO)
 GCC_TARGET_TOOL(nm, NM_FOR_TARGET, NM, [binutils/nm-new])
 GCC_TARGET_TOOL(objcopy, OBJCOPY_FOR_TARGET, OBJCOPY, [binutils/objcopy])
 GCC_TARGET_TOOL(objdump, OBJDUMP_FOR_TARGET, OBJDUMP, [binutils/objdump])
+GCC_TARGET_TOOL(otool, OTOOL_FOR_TARGET, OTOOL)
 GCC_TARGET_TOOL(ranlib, RANLIB_FOR_TARGET, RANLIB, [binutils/ranlib])
 GCC_TARGET_TOOL(readelf, READELF_FOR_TARGET, READELF, [binutils/readelf])
 GCC_TARGET_TOOL(strip, STRIP_FOR_TARGET, STRIP, [binutils/strip-new])
@@ -3690,8 +3848,8 @@ AC_SUBST(stage2_werror_flag)
 compare_exclusions="gcc/cc*-checksum\$(objext) | gcc/ada/*tools/*"
 case "$target" in
   hppa*64*-*-hpux*) ;;
-  hppa*-*-hpux*) compare_exclusions="gcc/cc*-checksum\$(objext) | */libgcc/lib2funcs* | gcc/ada/*tools/* | gcc/function-tests.o" ;;
-  powerpc*-ibm-aix*) compare_exclusions="gcc/cc*-checksum\$(objext) | gcc/ada/*tools/* | *libgomp*\$(objext)" ;;
+  hppa*-*-hpux*) compare_exclusions="$compare_exclusions | */libgcc/lib2funcs* | gcc/function-tests.o" ;;
+  powerpc*-ibm-aix*) compare_exclusions="$compare_exclusions | *libgomp*\$(objext)" ;;
 esac
 AC_SUBST(compare_exclusions)