# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_prog_cc_for_build.html # =========================================================================== # # SYNOPSIS # # AX_PROG_CC_FOR_BUILD # # DESCRIPTION # # This macro searches for a C compiler that generates native executables, # that is a C compiler that surely is not a cross-compiler. This can be # useful if you have to generate source code at compile-time like for # example GCC does. # # The macro sets the CC_FOR_BUILD and CPP_FOR_BUILD macros to anything # needed to compile or link (CC_FOR_BUILD) and preprocess (CPP_FOR_BUILD). # The value of these variables can be overridden by the user by specifying # a compiler with an environment variable (like you do for standard CC). # # It also sets BUILD_EXEEXT and BUILD_OBJEXT to the executable and object # file extensions for the build platform, and GCC_FOR_BUILD to `yes' if # the compiler we found is GCC. All these variables but GCC_FOR_BUILD are # substituted in the Makefile. # # LICENSE # # Copyright (c) 2008 Paolo Bonzini # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty. #serial 26 AU_ALIAS([AC_PROG_CC_FOR_BUILD], [AX_PROG_CC_FOR_BUILD]) AC_DEFUN([AX_PROG_CC_FOR_BUILD], [dnl AC_REQUIRE([AC_PROG_CC])dnl AC_REQUIRE([AC_PROG_CPP])dnl AC_REQUIRE([AC_CANONICAL_BUILD])dnl dnl Use the standard macros, but make them use other variable names dnl pushdef([ac_cv_prog_CPP], ac_cv_build_prog_CPP)dnl pushdef([ac_cv_prog_gcc], ac_cv_build_prog_gcc)dnl pushdef([ac_cv_prog_cc_c89], ac_cv_build_prog_cc_c89)dnl pushdef([ac_cv_prog_cc_c99], ac_cv_build_prog_cc_c99)dnl pushdef([ac_cv_prog_cc_c11], ac_cv_build_prog_cc_c11)dnl pushdef([ac_cv_prog_cc_c23], ac_cv_build_prog_cc_c23)dnl pushdef([ac_cv_prog_cc_stdc], ac_cv_build_prog_cc_stdc)dnl pushdef([ac_cv_prog_cc_works], ac_cv_build_prog_cc_works)dnl pushdef([ac_cv_prog_cc_cross], ac_cv_build_prog_cc_cross)dnl pushdef([ac_cv_prog_cc_g], ac_cv_build_prog_cc_g)dnl pushdef([ac_prog_cc_stdc], ac_build_prog_cc_stdc)dnl pushdef([ac_exeext], ac_build_exeext)dnl pushdef([ac_objext], ac_build_objext)dnl pushdef([CC], CC_FOR_BUILD)dnl pushdef([CPP], CPP_FOR_BUILD)dnl pushdef([GCC], GCC_FOR_BUILD)dnl pushdef([CFLAGS], CFLAGS_FOR_BUILD)dnl pushdef([CPPFLAGS], CPPFLAGS_FOR_BUILD)dnl pushdef([LDFLAGS], LDFLAGS_FOR_BUILD)dnl pushdef([host], build)dnl pushdef([host_alias], build_alias)dnl pushdef([host_cpu], build_cpu)dnl pushdef([host_vendor], build_vendor)dnl pushdef([host_os], build_os)dnl pushdef([ac_cv_host], ac_cv_build)dnl pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl pushdef([ac_cv_host_os], ac_cv_build_os)dnl pushdef([ac_tool_prefix], ac_build_tool_prefix)dnl pushdef([am_cv_CC_dependencies_compiler_type], am_cv_build_CC_dependencies_compiler_type)dnl pushdef([am_cv_prog_cc_c_o], am_cv_build_prog_cc_c_o)dnl pushdef([cross_compiling], cross_compiling_build)dnl dnl dnl These variables are problematic to rename by M4 macros, so we save dnl their values in alternative names, and restore the values later. dnl dnl _AC_COMPILER_EXEEXT and _AC_COMPILER_OBJEXT internally call dnl AC_SUBST which prevents the renaming of EXEEXT and OBJEXT dnl variables. It's not a good idea to rename ac_cv_exeext and dnl ac_cv_objext either as they're related. dnl Renaming ac_exeext and ac_objext is safe though. dnl ac_cv_host_exeext=$ac_cv_exeext AS_VAR_SET_IF([ac_cv_build_exeext], [ac_cv_exeext=$ac_cv_build_exeext], [AS_UNSET([ac_cv_exeext])]) ac_cv_host_objext=$ac_cv_objext AS_VAR_SET_IF([ac_cv_build_objext], [ac_cv_objext=$ac_cv_build_objext], [AS_UNSET([ac_cv_objext])]) dnl dnl ac_cv_c_compiler_gnu is used in _AC_LANG_COMPILER_GNU (called by dnl AC_PROG_CC) indirectly. dnl ac_cv_host_c_compiler_gnu=$ac_cv_c_compiler_gnu AS_VAR_SET_IF([ac_cv_build_c_compiler_gnu], [ac_cv_c_compiler_gnu=$ac_cv_build_c_compiler_gnu], [AS_UNSET([ac_cv_c_compiler_gnu])]) cross_compiling_build=no ac_build_tool_prefix= AS_IF([test -n "$build"], [ac_build_tool_prefix="$build-"], [test -n "$build_alias"],[ac_build_tool_prefix="$build_alias-"]) AC_LANG_PUSH([C]) AC_PROG_CC _AC_COMPILER_EXEEXT _AC_COMPILER_OBJEXT AC_PROG_CPP BUILD_EXEEXT=$ac_cv_exeext BUILD_OBJEXT=$ac_cv_objext dnl Restore the old definitions dnl popdef([cross_compiling])dnl popdef([am_cv_prog_cc_c_o])dnl popdef([am_cv_CC_dependencies_compiler_type])dnl popdef([ac_tool_prefix])dnl popdef([ac_cv_host_os])dnl popdef([ac_cv_host_vendor])dnl popdef([ac_cv_host_cpu])dnl popdef([ac_cv_host_alias])dnl popdef([ac_cv_host])dnl popdef([host_os])dnl popdef([host_vendor])dnl popdef([host_cpu])dnl popdef([host_alias])dnl popdef([host])dnl popdef([LDFLAGS])dnl popdef([CPPFLAGS])dnl popdef([CFLAGS])dnl popdef([GCC])dnl popdef([CPP])dnl popdef([CC])dnl popdef([ac_objext])dnl popdef([ac_exeext])dnl popdef([ac_prog_cc_stdc])dnl popdef([ac_cv_prog_cc_g])dnl popdef([ac_cv_prog_cc_cross])dnl popdef([ac_cv_prog_cc_works])dnl popdef([ac_cv_prog_cc_stdc])dnl popdef([ac_cv_prog_cc_c23])dnl popdef([ac_cv_prog_cc_c11])dnl popdef([ac_cv_prog_cc_c99])dnl popdef([ac_cv_prog_cc_c89])dnl popdef([ac_cv_prog_gcc])dnl popdef([ac_cv_prog_CPP])dnl dnl ac_cv_exeext=$ac_cv_host_exeext EXEEXT=$ac_cv_host_exeext ac_cv_objext=$ac_cv_host_objext OBJEXT=$ac_cv_host_objext ac_cv_c_compiler_gnu=$ac_cv_host_c_compiler_gnu ac_compiler_gnu=$ac_cv_host_c_compiler_gnu dnl restore global variables ac_ext, ac_cpp, ac_compile, dnl ac_link, ac_compiler_gnu (dependent on the current dnl language after popping): AC_LANG_POP([C]) dnl Finally, set Makefile variables dnl AC_SUBST([BUILD_EXEEXT])dnl AC_SUBST([BUILD_OBJEXT])dnl AC_SUBST([CFLAGS_FOR_BUILD])dnl AC_SUBST([CPPFLAGS_FOR_BUILD])dnl AC_SUBST([LDFLAGS_FOR_BUILD])dnl ])