m4/ax_prog_cc_for_build.m4

   1 # ===========================================================================
   2 #   http://www.gnu.org/software/autoconf-archive/ax_prog_cc_for_build.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_PROG_CC_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 CC_FOR_BUILD and CPP_FOR_BUILD macros to anything
  17 #   needed to compile or link (CC_FOR_BUILD) and preprocess (CPP_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 CC).
  20 #
  21 #   It also sets BUILD_EXEEXT and BUILD_OBJEXT to the executable and object
  22 #   file extensions for the build platform, and GCC_FOR_BUILD to `yes' if
  23 #   the compiler we found is GCC. All these variables but GCC_FOR_BUILD are
  24 #   substituted in the Makefile.
  25 #
  26 # LICENSE
  27 #
  28 #   Copyright (c) 2008 Paolo Bonzini <bonzini@gnu.org>
  29 #
  30 #   Copying and distribution of this file, with or without modification, are
  31 #   permitted in any medium without royalty provided the copyright notice
  32 #   and this notice are preserved. This file is offered as-is, without any
  33 #   warranty.
  34
  35 #serial 5
  36
  37 AU_ALIAS([AC_PROG_CC_FOR_BUILD], [AX_PROG_CC_FOR_BUILD])
  38 AC_DEFUN([AX_PROG_CC_FOR_BUILD], [dnl
  39 AC_REQUIRE([AC_PROG_CC])dnl
  40 AC_REQUIRE([AC_PROG_CPP])dnl
  41 AC_REQUIRE([AC_EXEEXT])dnl
  42 AC_REQUIRE([AC_CANONICAL_SYSTEM])dnl
  43 dnl
  44 pushdef([AC_TRY_COMPILER], [
  45 cat > conftest.$ac_ext << EOF
  46 #line __oline__ "configure"
  47 #include "confdefs.h"
  48 [$1]
  49 EOF
  50 # If we can't run a trivial program, we are probably using a cross
  51 compiler.
  52 # Fail miserably.
  53 if AC_TRY_EVAL(ac_link) && test -s conftest${ac_exeext} && (./conftest;
  54 exit) 2>/dev/null; then
  55   [$2]=yes
  56 else
  57   echo "configure: failed program was:" >&AC_FD_CC
  58   cat conftest.$ac_ext >&AC_FD_CC
  59   [$2]=no
  60 fi
  61 [$3]=no
  62 rm -fr conftest*])dnl
  63
  64 dnl Use the standard macros, but make them use other variable names
  65 dnl
  66 pushdef([cross_compiling], [#])dnl
  67 pushdef([ac_cv_prog_CPP], ac_cv_build_prog_CPP)dnl
  68 pushdef([ac_cv_prog_gcc], ac_cv_build_prog_gcc)dnl
  69 pushdef([ac_cv_prog_cc_works], ac_cv_build_prog_cc_works)dnl
  70 pushdef([ac_cv_prog_cc_cross], ac_cv_build_prog_cc_cross)dnl
  71 pushdef([ac_cv_prog_cc_g], ac_cv_build_prog_cc_g)dnl
  72 pushdef([ac_cv_exeext], ac_cv_build_exeext)dnl
  73 pushdef([ac_cv_objext], ac_cv_build_objext)dnl
  74 pushdef([ac_exeext], ac_build_exeext)dnl
  75 pushdef([ac_objext], ac_build_objext)dnl
  76 pushdef([CC], CC_FOR_BUILD)dnl
  77 pushdef([CPP], CPP_FOR_BUILD)dnl
  78 pushdef([CFLAGS], CFLAGS_FOR_BUILD)dnl
  79 pushdef([CPPFLAGS], CPPFLAGS_FOR_BUILD)dnl
  80 pushdef([LDFLAGS], LDFLAGS_FOR_BUILD)dnl
  81 pushdef([host], build)dnl
  82 pushdef([host_alias], build_alias)dnl
  83 pushdef([host_cpu], build_cpu)dnl
  84 pushdef([host_vendor], build_vendor)dnl
  85 pushdef([host_os], build_os)dnl
  86 pushdef([ac_cv_host], ac_cv_build)dnl
  87 pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl
  88 pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl
  89 pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl
  90 pushdef([ac_cv_host_os], ac_cv_build_os)dnl
  91 pushdef([ac_cpp], ac_build_cpp)dnl
  92 pushdef([ac_compile], ac_build_compile)dnl
  93 pushdef([ac_link], ac_build_link)dnl
  94 pushdef([ac_tool_prefix], [#])dnl
  95
  96 AC_PROG_CC
  97 AC_PROG_CPP
  98 AC_EXEEXT
  99
 100 dnl Restore the old definitions
 101 dnl
 102 popdef([AC_TRY_COMPILER])dnl
 103 popdef([ac_tool_prefix])dnl
 104 popdef([ac_link])dnl
 105 popdef([ac_compile])dnl
 106 popdef([ac_cpp])dnl
 107 popdef([ac_cv_host_os])dnl
 108 popdef([ac_cv_host_vendor])dnl
 109 popdef([ac_cv_host_cpu])dnl
 110 popdef([ac_cv_host_alias])dnl
 111 popdef([ac_cv_host])dnl
 112 popdef([host_os])dnl
 113 popdef([host_vendor])dnl
 114 popdef([host_cpu])dnl
 115 popdef([host_alias])dnl
 116 popdef([host])dnl
 117 popdef([CPPFLAGS])dnl
 118 popdef([CFLAGS])dnl
 119 popdef([CPP])dnl
 120 popdef([CC])dnl
 121 popdef([ac_objext])dnl
 122 popdef([ac_exeext])dnl
 123 popdef([ac_cv_objext])dnl
 124 popdef([ac_cv_exeext])dnl
 125 popdef([ac_cv_prog_cc_g])dnl
 126 popdef([ac_cv_prog_cc_works])dnl
 127 popdef([ac_cv_prog_cc_cross])dnl
 128 popdef([ac_cv_prog_gcc])dnl
 129 popdef([cross_compiling])dnl
 130
 131 dnl Finally, set Makefile variables
 132 dnl
 133 BUILD_EXEEXT=$ac_build_exeext
 134 BUILD_OBJEXT=$ac_build_objext
 135 AC_SUBST(BUILD_EXEEXT)dnl
 136 AC_SUBST(BUILD_OBJEXT)dnl
 137 AC_SUBST([CFLAGS_FOR_BUILD])dnl
 138 AC_SUBST([CPPFLAGS_FOR_BUILD])dnl
 139 AC_SUBST([LDFLAGS_FOR_BUILD])dnl
 140 ])