libstdc++: Enable three-way comparison for iota_view iterators

[gcc.git] / libstdc++-v3 / linkage.m4

diff --git a/libstdc++-v3/linkage.m4 b/libstdc++-v3/linkage.m4
index f1a15ac18852f58a376f23438f24541d3bfd6f3e..45a09cdf44538379c247c3909c0fb470a7b27c54 100644 (file)
--- a/libstdc++-v3/linkage.m4
+++ b/libstdc++-v3/linkage.m4
@@ -232,6 +232,35 @@ AC_DEFUN([GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_0], [
 ])
 
 
+dnl
+dnl Check to see if the (stdlib function) argument passed is
+dnl 1) declared when using the c++ compiler
+dnl 2) has "C" linkage
+dnl
+dnl argument 1 is name of function to check
+dnl
+dnl ASSUMES argument is a stdlib function with ONE parameter
+dnl
+dnl GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_1
+AC_DEFUN([GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_1], [
+  AC_MSG_CHECKING([for $1 declaration])
+  if test x${glibcxx_cv_func_$1_use+set} != xset; then
+    AC_CACHE_VAL(glibcxx_cv_func_$1_use, [
+      AC_LANG_SAVE
+      AC_LANG_CPLUSPLUS
+      AC_TRY_COMPILE([#include <stdlib.h>],
+                     [ $1(0);],
+                     [glibcxx_cv_func_$1_use=yes], [glibcxx_cv_func_$1_use=no])
+      AC_LANG_RESTORE
+    ])
+  fi
+  AC_MSG_RESULT($glibcxx_cv_func_$1_use)
+  if test x$glibcxx_cv_func_$1_use = x"yes"; then
+    AC_CHECK_FUNCS($1)
+  fi
+])
+
+
 dnl
 dnl Check to see if the (stdlib function) argument passed is
 dnl 1) declared when using the c++ compiler
@@ -306,6 +335,8 @@ AC_DEFUN([GLIBCXX_CHECK_STDLIB_SUPPORT], [
   ac_save_CXXFLAGS="$CXXFLAGS"
   CXXFLAGS='-fno-builtin -D_GNU_SOURCE'
 
+  GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_1(at_quick_exit)
+  GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_1(quick_exit)
   GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_2(strtold)
   GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_2(strtof)
 
@@ -336,7 +367,6 @@ AC_DEFUN([GLIBCXX_CHECK_MATH_SUPPORT], [
   GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_1(isinf)
   GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_1(isnan)
   GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_1(finite)
-  GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_2(copysign)
   GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_3(sincos)
   GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_1(fpclass)
   GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_1(qfpclass)
@@ -380,7 +410,6 @@ AC_DEFUN([GLIBCXX_CHECK_MATH_SUPPORT], [
                                           ceill floorl)
   GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_1(isnanl)
   GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_1(isinfl)
-  GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_2(copysignl)
   GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_2(atan2l)
   GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_1(expl)
   GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_1(fabsl)
@@ -399,53 +428,3 @@ AC_DEFUN([GLIBCXX_CHECK_MATH_SUPPORT], [
   LIBS="$ac_save_LIBS"
   CXXFLAGS="$ac_save_CXXFLAGS"
 ])
-
-
-dnl
-dnl Check to see if there is native support for complex
-dnl
-dnl Don't compile bits in math/* if native support exits.
-dnl
-dnl Define USE_COMPLEX_LONG_DOUBLE etc if "copysignl" is found.
-dnl
-dnl GLIBCXX_CHECK_COMPLEX_MATH_SUPPORT
-AC_DEFUN([GLIBCXX_CHECK_COMPLEX_MATH_SUPPORT], [
-  dnl Check for complex versions of math functions of platform.  This will
-  dnl always pass if libm is available, and fail if it isn't.  If it is
-  dnl available, we assume we'll need it later, so add it to LIBS.
-  AC_CHECK_LIB(m, main)
-  AC_REPLACE_MATHFUNCS(copysignf)
-
-  dnl For __signbit to signbit conversions.
-  dnl Not sure why this is done, as these will be macros mostly. 
-  dnl Should probably coordinate this with std_cmath.h.
-  AC_CHECK_FUNCS([__signbit], , [LIBMATHOBJS="$LIBMATHOBJS signbit.lo"])
-
-  AC_CHECK_FUNCS([__signbitf], , [LIBMATHOBJS="$LIBMATHOBJS signbitf.lo"])
-
-  dnl Compile the long double complex functions only if the function
-  dnl provides the non-complex long double functions that are needed.
-  dnl Currently this includes copysignl, which should be
-  dnl cached from the GLIBCXX_CHECK_MATH_SUPPORT macro, above.
-  if test x$ac_cv_func_copysignl = x"yes"; then
-    AC_CHECK_FUNCS([__signbitl], , [LIBMATHOBJS="$LIBMATHOBJS signbitl.lo"])
-  fi
-
-  # Used in libmath/Makefile.am.
-  if test -n "$LIBMATHOBJS"; then
-    need_libmath=yes
-  fi
-  AC_SUBST(LIBMATHOBJS)
-])
-
-
-# Check for functions in math library.
-# Ulrich Drepper <drepper@cygnus.com>, 1998.
-#
-# This file can be copied and used freely without restrictions.  It can
-# be used in projects which are not available under the GNU Public License
-# but which still want to provide support for the GNU gettext functionality.
-# Please note that the actual code is *not* freely available.
-dnl AC_REPLACE_MATHFUNCS(FUNCTION...)
-AC_DEFUN([AC_REPLACE_MATHFUNCS],
-[AC_CHECK_FUNCS([$1], , [LIBMATHOBJS="$LIBMATHOBJS ${ac_func}.lo"])])