1# =========================================================================== 2# https://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 21 36 37AU_ALIAS([AC_PROG_CC_FOR_BUILD], [AX_PROG_CC_FOR_BUILD]) 38AC_DEFUN([AX_PROG_CC_FOR_BUILD], [dnl 39AC_REQUIRE([AC_PROG_CC])dnl 40AC_REQUIRE([AC_PROG_CPP])dnl 41AC_REQUIRE([AC_CANONICAL_BUILD])dnl 42 43dnl Use the standard macros, but make them use other variable names 44dnl 45pushdef([ac_cv_prog_CPP], ac_cv_build_prog_CPP)dnl 46pushdef([ac_cv_prog_cc_c89], ac_cv_build_prog_cc_c89)dnl 47pushdef([ac_cv_prog_cc_c99], ac_cv_build_prog_cc_c99)dnl 48pushdef([ac_cv_prog_cc_c11], ac_cv_build_prog_cc_c11)dnl 49pushdef([ac_cv_prog_gcc], ac_cv_build_prog_gcc)dnl 50pushdef([ac_cv_prog_cc_works], ac_cv_build_prog_cc_works)dnl 51pushdef([ac_cv_prog_cc_cross], ac_cv_build_prog_cc_cross)dnl 52pushdef([ac_cv_prog_cc_g], ac_cv_build_prog_cc_g)dnl 53pushdef([ac_cv_c_compiler_gnu], ac_cv_build_c_compiler_gnu)dnl 54pushdef([ac_cv_exeext], ac_cv_build_exeext)dnl 55pushdef([ac_cv_objext], ac_cv_build_objext)dnl 56pushdef([ac_exeext], ac_build_exeext)dnl 57pushdef([ac_objext], ac_build_objext)dnl 58pushdef([CC], CC_FOR_BUILD)dnl 59pushdef([CCDEPMODE], CCDEPMODE_FOR_BUILD)dnl 60pushdef([CPP], CPP_FOR_BUILD)dnl 61pushdef([GCC], GCC_FOR_BUILD)dnl 62pushdef([CFLAGS], CFLAGS_FOR_BUILD)dnl 63pushdef([CPPFLAGS], CPPFLAGS_FOR_BUILD)dnl 64pushdef([EXEEXT], BUILD_EXEEXT)dnl 65pushdef([LDFLAGS], LDFLAGS_FOR_BUILD)dnl 66pushdef([OBJEXT], BUILD_OBJEXT)dnl 67pushdef([host], build)dnl 68pushdef([host_alias], build_alias)dnl 69pushdef([host_cpu], build_cpu)dnl 70pushdef([host_vendor], build_vendor)dnl 71pushdef([host_os], build_os)dnl 72pushdef([ac_cv_host], ac_cv_build)dnl 73pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl 74pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl 75pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl 76pushdef([ac_cv_host_os], ac_cv_build_os)dnl 77pushdef([ac_tool_prefix], ac_build_tool_prefix)dnl 78pushdef([am_cv_CC_dependencies_compiler_type], am_cv_build_CC_dependencies_compiler_type)dnl 79pushdef([am__fastdepCC_FALSE], am__fastdepCC_build_FALSE)dnl 80pushdef([am__fastdepCC_TRUE], am__fastdepCC_build_TRUE)dnl 81pushdef([am_cv_prog_cc_c_o], am_cv_build_prog_cc_c_o)dnl 82pushdef([cross_compiling], cross_compiling_build)dnl 83 84cross_compiling_build=no 85 86ac_build_tool_prefix= 87AS_IF([test -n "$build"], [ac_build_tool_prefix="$build-"], 88 [test -n "$build_alias"],[ac_build_tool_prefix="$build_alias-"]) 89 90AC_LANG_PUSH([C]) 91 92dnl The pushdef([ac_cv_c_compiler_gnu], ...) currently does not cover 93dnl the use of this variable in _AC_LANG_COMPILER_GNU called by 94dnl AC_PROG_CC. Unset this cache variable temporarily as a workaround. 95was_set_c_compiler_gnu=${[ac_cv_c_compiler_gnu]+y} 96AS_IF([test ${was_set_c_compiler_gnu}], 97 [saved_c_compiler_gnu=$[ac_cv_c_compiler_gnu] 98 AS_UNSET([[ac_cv_c_compiler_gnu]])]) 99 100AC_PROG_CC 101 102dnl Restore ac_cv_c_compiler_gnu 103AS_IF([test ${was_set_c_compiler_gnu}], 104 [[ac_cv_c_compiler_gnu]=$[saved_c_compiler_gnu]]) 105 106_AC_COMPILER_EXEEXT 107_AC_COMPILER_OBJEXT 108AC_PROG_CPP 109 110dnl Restore the old definitions 111dnl 112popdef([cross_compiling])dnl 113popdef([am_cv_prog_cc_c_o])dnl 114popdef([am__fastdepCC_TRUE])dnl 115popdef([am__fastdepCC_FALSE])dnl 116popdef([am_cv_CC_dependencies_compiler_type])dnl 117popdef([ac_tool_prefix])dnl 118popdef([ac_cv_host_os])dnl 119popdef([ac_cv_host_vendor])dnl 120popdef([ac_cv_host_cpu])dnl 121popdef([ac_cv_host_alias])dnl 122popdef([ac_cv_host])dnl 123popdef([host_os])dnl 124popdef([host_vendor])dnl 125popdef([host_cpu])dnl 126popdef([host_alias])dnl 127popdef([host])dnl 128popdef([OBJEXT])dnl 129popdef([LDFLAGS])dnl 130popdef([EXEEXT])dnl 131popdef([CPPFLAGS])dnl 132popdef([CFLAGS])dnl 133popdef([GCC])dnl 134popdef([CPP])dnl 135popdef([CCDEPMODE])dnl 136popdef([CC])dnl 137popdef([ac_objext])dnl 138popdef([ac_exeext])dnl 139popdef([ac_cv_objext])dnl 140popdef([ac_cv_exeext])dnl 141popdef([ac_cv_c_compiler_gnu])dnl 142popdef([ac_cv_prog_cc_g])dnl 143popdef([ac_cv_prog_cc_cross])dnl 144popdef([ac_cv_prog_cc_works])dnl 145popdef([ac_cv_prog_cc_c89])dnl 146popdef([ac_cv_prog_gcc])dnl 147popdef([ac_cv_prog_CPP])dnl 148 149dnl restore global variables ac_ext, ac_cpp, ac_compile, 150dnl ac_link, ac_compiler_gnu (dependant on the current 151dnl language after popping): 152AC_LANG_POP([C]) 153 154dnl Finally, set Makefile variables using the ac_cv_build_* variables 155dnl 156AC_SUBST(BUILD_EXEEXT)dnl 157AC_SUBST(BUILD_OBJEXT)dnl 158dnl Since autoconf 2.70, the call to AC_SUBST in the following lines 159dnl of _AC_COMPILER_EXEEXT 160dnl AC_SUBST([EXEEXT], [$ac_cv_exeext])dnl 161dnl ac_exeext=$EXEEXT 162dnl no longer sets BUILD_EXEEXT, but EXEEXT instead. 163dnl This means not only that BUILD_EXEEXT is not getting set, 164dnl but also that the original EXEEXT is overwritten 165dnl by a possibly different value. Furthermore, ac_build_exeext 166dnl is assigned an undefined value. 167dnl Restore EXEEXT to the original value and 168dnl set BUILD_EXEEXT and ac_build_exeext. 169dnl Similarly for _AC_COMPILER_OBJEXT and OBJEXT. 170m4_version_prereq([2.70],[dnl 171EXEEXT=$ac_cv_exeext 172BUILD_EXEEXT=$ac_cv_build_exeext; ac_build_exeext=$ac_cv_build_exeext 173OBJEXT=$ac_cv_objext 174BUILD_OBJEXT=$ac_cv_build_objext; ac_build_objext=$ac_cv_build_objext],[[]]) 175dnl Similarly to _AC_COMPILER_EXEEXT and _AC_COMPILER_OBJEXT, 176dnl the line 177dnl AC_SUBST([$1DEPMODE], [depmode=$am_cv_$1_dependencies_compiler_type]) 178dnl of _AM_DEPENDENCIES no longer sets CCDEPMODE_FOR_BUILD, 179dnl but overrides CCDEPMODE. 180dnl Restore CCDEPMODE and set CCDEPMODE_FOR_BUILD. 181AC_SUBST(CCDEPMODE_FOR_BUILD)dnl 182CCDEPMODE=depmode=$am_cv_CC_dependencies_compiler_type 183CCDEPMODE_FOR_BUILD=depmode=$am_cv_build_CC_dependencies_compiler_type 184AC_SUBST([CFLAGS_FOR_BUILD])dnl 185AC_SUBST([CPPFLAGS_FOR_BUILD])dnl 186AC_SUBST([LDFLAGS_FOR_BUILD])dnl 187]) 188