m4/ax_prog_cxx_for_build.m4

   1 # ===========================================================================
   2 #   http://www.gnu.org/software/autoconf-archive/ax_prog_cxx_for_build.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_PROG_CXX_FOR_BUILD
   8 #
   9 # DESCRIPTION
  10 #
  11 #   This macro searches for a C++ compiler that generates native executables,
  12 #   that is a C++ compiler that surely is not a cross-compiler. This can be
  13 #   useful if you have to generate source code at compile-time like for
  14 #   example GCC does.
  15 #
  16 #   The macro sets the CXX_FOR_BUILD and CXXCPP_FOR_BUILD macros to anything
  17 #   needed to compile or link (CXX_FOR_BUILD) and preprocess (CXXCPP_FOR_BUILD).
  18 #   The value of these variables can be overridden by the user by specifying
  19 #   a compiler with an environment variable (like you do for standard CXX).
  20 #
  21 # LICENSE
  22 #
  23 #   Copyright (c) 2008 Paolo Bonzini <bonzini@gnu.org>
  24 #   Copyright (c) 2012 Avionic Design GmbH
  25 #
  26 #   Based on the AX_PROG_CC_FOR_BUILD macro by Paolo Bonzini.
  27 #
  28 #   Copying and distribution of this file, with or without modification, are
  29 #   permitted in any medium without royalty provided the copyright notice
  30 #   and this notice are preserved. This file is offered as-is, without any
  31 #   warranty.
  32
  33 #serial 5
  34
  35 AU_ALIAS([AC_PROG_CXX_FOR_BUILD], [AX_PROG_CXX_FOR_BUILD])
  36 AC_DEFUN([AX_PROG_CXX_FOR_BUILD], [dnl
  37 AC_REQUIRE([AX_PROG_CC_FOR_BUILD])dnl
  38 AC_REQUIRE([AC_PROG_CXX])dnl
  39 AC_REQUIRE([AC_PROG_CXXCPP])dnl
  40 AC_REQUIRE([AC_CANONICAL_SYSTEM])dnl
  41 dnl
  42 pushdef([AC_TRY_COMPILER], [
  43 cat > conftest.$ac_ext << EOF
  44 #line __oline__ "configure"
  45 #include "confdefs.h"
  46 [$1]
  47 EOF
  48 # If we can't run a trivial program, we are probably using a cross
  49 compiler.
  50 # Fail miserably.
  51 if AC_TRY_EVAL(ac_link) && test -s conftest${ac_exeext} && (./conftest;
  52 exit) 2>/dev/null; then
  53   [$2]=yes
  54 else
  55   echo "configure: failed program was:" >&AC_FD_CC
  56   cat conftest.$ac_ext >&AC_FD_CC
  57   [$2]=no
  58 fi
  59 [$3]=no
  60 rm -fr conftest*])dnl
  61
  62 dnl Use the standard macros, but make them use other variable names
  63 dnl
  64 pushdef([cross_compiling], [#])dnl
  65 pushdef([ac_cv_prog_CXXCPP], ac_cv_build_prog_CXXCPP)dnl
  66 pushdef([ac_cv_prog_gxx], ac_cv_build_prog_gxx)dnl
  67 pushdef([ac_cv_prog_cxx_works], ac_cv_build_prog_cxx_works)dnl
  68 pushdef([ac_cv_prog_cxx_cross], ac_cv_build_prog_cxx_cross)dnl
  69 pushdef([ac_cv_prog_cxx_g], ac_cv_build_prog_cxx_g)dnl
  70 pushdef([CXX], CXX_FOR_BUILD)dnl
  71 pushdef([CXXCPP], CXXCPP_FOR_BUILD)dnl
  72 pushdef([CXXFLAGS], CXXFLAGS_FOR_BUILD)dnl
  73 pushdef([CXXCPPFLAGS], CXXCPPFLAGS_FOR_BUILD)dnl
  74 pushdef([host], build)dnl
  75 pushdef([host_alias], build_alias)dnl
  76 pushdef([host_cpu], build_cpu)dnl
  77 pushdef([host_vendor], build_vendor)dnl
  78 pushdef([host_os], build_os)dnl
  79 pushdef([ac_cv_host], ac_cv_build)dnl
  80 pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl
  81 pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl
  82 pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl
  83 pushdef([ac_cv_host_os], ac_cv_build_os)dnl
  84 pushdef([ac_cxxcpp], ac_build_cxxcpp)dnl
  85 pushdef([ac_compile], ac_build_compile)dnl
  86 pushdef([ac_link], ac_build_link)dnl
  87 pushdef([ac_tool_prefix], [#])dnl
  88
  89 AC_PROG_CXX
  90 AC_PROG_CXXCPP
  91
  92 dnl Restore the old definitions
  93 dnl
  94 popdef([AC_TRY_COMPILER])dnl
  95 popdef([ac_tool_prefix])dnl
  96 popdef([ac_link])dnl
  97 popdef([ac_compile])dnl
  98 popdef([ac_cxxcpp])dnl
  99 popdef([ac_cv_host_os])dnl
 100 popdef([ac_cv_host_vendor])dnl
 101 popdef([ac_cv_host_cpu])dnl
 102 popdef([ac_cv_host_alias])dnl
 103 popdef([ac_cv_host])dnl
 104 popdef([host_os])dnl
 105 popdef([host_vendor])dnl
 106 popdef([host_cpu])dnl
 107 popdef([host_alias])dnl
 108 popdef([host])dnl
 109 popdef([CXXCPPFLAGS])dnl
 110 popdef([CXXFLAGS])dnl
 111 popdef([CXXCPP])dnl
 112 popdef([CXX])dnl
 113 popdef([ac_cv_prog_cxx_g])dnl
 114 popdef([ac_cv_prog_cxx_works])dnl
 115 popdef([ac_cv_prog_cxx_cross])dnl
 116 popdef([ac_cv_prog_gxx])dnl
 117 popdef([cross_compiling])dnl
 118
 119 dnl Finally, set Makefile variables
 120 dnl
 121 AC_SUBST([CXXFLAGS_FOR_BUILD])dnl
 122 AC_SUBST([CXXCPPFLAGS_FOR_BUILD])dnl
 123 ])