granicus.if.org Git - strace/blob - 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 #   Copyright (c) 2008-2017 The strace developers.
  30 #
  31 #   Copying and distribution of this file, with or without modification, are
  32 #   permitted in any medium without royalty provided the copyright notice
  33 #   and this notice are preserved. This file is offered as-is, without any
  34 #   warranty.
  35
  36 #serial 8
  37 #modified for strace project
  38
  39 AU_ALIAS([AC_PROG_CC_FOR_BUILD], [AX_PROG_CC_FOR_BUILD])
  40 AC_DEFUN([AX_PROG_CC_FOR_BUILD], [dnl
  41 AC_REQUIRE([AC_PROG_CC])dnl
  42 AC_REQUIRE([AC_PROG_CPP])dnl
  43 AC_REQUIRE([AC_EXEEXT])dnl
  44 AC_REQUIRE([AC_CANONICAL_HOST])dnl
  45
  46 dnl Use the standard macros, but make them use other variable names
  47 dnl
  48 pushdef([ac_cv_prog_CPP], ac_cv_build_prog_CPP)dnl
  49 pushdef([ac_cv_prog_gcc], ac_cv_build_prog_gcc)dnl
  50 pushdef([ac_cv_prog_cc_works], ac_cv_build_prog_cc_works)dnl
  51 pushdef([ac_cv_prog_cc_cross], ac_cv_build_prog_cc_cross)dnl
  52 pushdef([ac_cv_prog_cc_g], ac_cv_build_prog_cc_g)dnl
  53 pushdef([ac_cv_prog_cc_stdc], ac_cv_build_prog_cc_stdc)dnl
  54 pushdef([ac_cv_prog_cc_c11], ac_cv_build_prog_cc_c11)dnl
  55 pushdef([ac_cv_prog_cc_c99], ac_cv_build_prog_cc_c99)dnl
  56 pushdef([ac_cv_prog_cc_c89], ac_cv_build_prog_cc_c89)dnl
  57 pushdef([ac_cv_exeext], ac_cv_build_exeext)dnl
  58 pushdef([ac_cv_objext], ac_cv_build_objext)dnl
  59 pushdef([ac_exeext], ac_build_exeext)dnl
  60 pushdef([ac_objext], ac_build_objext)dnl
  61 pushdef([CC], CC_FOR_BUILD)dnl
  62 pushdef([CPP], CPP_FOR_BUILD)dnl
  63 pushdef([CFLAGS], CFLAGS_FOR_BUILD)dnl
  64 pushdef([CPPFLAGS], CPPFLAGS_FOR_BUILD)dnl
  65 pushdef([LDFLAGS], LDFLAGS_FOR_BUILD)dnl
  66 pushdef([WARN_CFLAGS], WARN_CFLAGS_FOR_BUILD)dnl
  67 pushdef([host], build)dnl
  68 pushdef([host_alias], build_alias)dnl
  69 pushdef([host_cpu], build_cpu)dnl
  70 pushdef([host_vendor], build_vendor)dnl
  71 pushdef([host_os], build_os)dnl
  72 pushdef([ac_cv_host], ac_cv_build)dnl
  73 pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl
  74 pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl
  75 pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl
  76 pushdef([ac_cv_host_os], ac_cv_build_os)dnl
  77 pushdef([am_cv_prog_cc_c_o], am_cv_build_prog_cc_c_o)dnl
  78 pushdef([am_cv_CC_dependencies_compiler_type], am_cv_build_CC_dependencies_compiler_type)dnl
  79 pushdef([gl_unknown_warnings_are_errors], gl_build_unknown_warnings_are_errors)dnl
  80
  81 st_SAVE_VAR([ac_c_decl_warn_flag])
  82 st_SAVE_VAR([ac_c_preproc_warn_flag])
  83 st_SAVE_VAR([ac_c_werror_flag])
  84 st_SAVE_VAR([ac_compile])
  85 st_SAVE_VAR([ac_compiler_gnu])
  86 st_SAVE_VAR([ac_cpp])
  87 st_SAVE_VAR([ac_cv_c_compiler_gnu])
  88 st_SAVE_VAR([ac_cv_c_decl_report])
  89 st_SAVE_VAR([ac_link])
  90 st_SAVE_VAR([ac_tool_prefix])
  91 st_SAVE_VAR([cross_compiling])
  92 cross_compiling=no
  93
  94 AC_MSG_NOTICE([looking for a C compiler that generates native executables])
  95 AC_PROG_CC
  96 AC_PROG_CPP
  97 AC_EXEEXT
  98
  99 st_WARN_CFLAGS
 100
 101 st_RESTORE_VAR([cross_compiling])
 102 st_RESTORE_VAR([ac_tool_prefix])
 103 st_RESTORE_VAR([ac_link])
 104 st_RESTORE_VAR([ac_cv_c_decl_report])
 105 st_RESTORE_VAR([ac_cv_c_compiler_gnu])
 106 st_RESTORE_VAR([ac_cpp])
 107 st_RESTORE_VAR([ac_compiler_gnu])
 108 st_RESTORE_VAR([ac_compile])
 109 st_RESTORE_VAR([ac_c_werror_flag])
 110 st_RESTORE_VAR([ac_c_preproc_warn_flag])
 111 st_RESTORE_VAR([ac_c_decl_warn_flag])
 112
 113 dnl Restore the old definitions
 114 dnl
 115 popdef([gl_unknown_warnings_are_errors])dnl
 116 popdef([am_cv_CC_dependencies_compiler_type])dnl
 117 popdef([am_cv_prog_cc_c_o])dnl
 118 popdef([ac_cv_host_os])dnl
 119 popdef([ac_cv_host_vendor])dnl
 120 popdef([ac_cv_host_cpu])dnl
 121 popdef([ac_cv_host_alias])dnl
 122 popdef([ac_cv_host])dnl
 123 popdef([host_os])dnl
 124 popdef([host_vendor])dnl
 125 popdef([host_cpu])dnl
 126 popdef([host_alias])dnl
 127 popdef([host])dnl
 128 popdef([WARN_CFLAGS])dnl
 129 popdef([LDFLAGS])dnl
 130 popdef([CPPFLAGS])dnl
 131 popdef([CFLAGS])dnl
 132 popdef([CPP])dnl
 133 popdef([CC])dnl
 134 popdef([ac_objext])dnl
 135 popdef([ac_exeext])dnl
 136 popdef([ac_cv_objext])dnl
 137 popdef([ac_cv_exeext])dnl
 138 popdef([ac_cv_prog_cc_c89])dnl
 139 popdef([ac_cv_prog_cc_c99])dnl
 140 popdef([ac_cv_prog_cc_c11])dnl
 141 popdef([ac_cv_prog_cc_stdc])dnl
 142 popdef([ac_cv_prog_cc_g])dnl
 143 popdef([ac_cv_prog_cc_cross])dnl
 144 popdef([ac_cv_prog_cc_works])dnl
 145 popdef([ac_cv_prog_gcc])dnl
 146 popdef([ac_cv_prog_CPP])dnl
 147
 148 dnl Finally, set Makefile variables
 149 dnl
 150 BUILD_EXEEXT=$ac_build_exeext
 151 BUILD_OBJEXT=$ac_build_objext
 152 AC_SUBST(BUILD_EXEEXT)dnl
 153 AC_SUBST(BUILD_OBJEXT)dnl
 154 AC_SUBST([CFLAGS_FOR_BUILD])dnl
 155 AC_SUBST([CPPFLAGS_FOR_BUILD])dnl
 156 AC_SUBST([LDFLAGS_FOR_BUILD])dnl
 157 AC_SUBST([WARN_CFLAGS_FOR_BUILD])dnl
 158 ])