# =========================================================================== # 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 21 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_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_gcc], ac_cv_build_prog_gcc)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_cv_c_compiler_gnu], ac_cv_build_c_compiler_gnu)dnl pushdef([ac_cv_exeext], ac_cv_build_exeext)dnl pushdef([ac_cv_objext], ac_cv_build_objext)dnl pushdef([ac_exeext], ac_build_exeext)dnl pushdef([ac_objext], ac_build_objext)dnl pushdef([CC], CC_FOR_BUILD)dnl pushdef([CCDEPMODE], CCDEPMODE_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([EXEEXT], BUILD_EXEEXT)dnl pushdef([LDFLAGS], LDFLAGS_FOR_BUILD)dnl pushdef([OBJEXT], BUILD_OBJEXT)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__fastdepCC_FALSE], am__fastdepCC_build_FALSE)dnl pushdef([am__fastdepCC_TRUE], am__fastdepCC_build_TRUE)dnl pushdef([am_cv_prog_cc_c_o], am_cv_build_prog_cc_c_o)dnl pushdef([cross_compiling], cross_compiling_build)dnl 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]) dnl The pushdef([ac_cv_c_compiler_gnu], ...) currently does not cover dnl the use of this variable in _AC_LANG_COMPILER_GNU called by dnl AC_PROG_CC. Unset this cache variable temporarily as a workaround. was_set_c_compiler_gnu=${[ac_cv_c_compiler_gnu]+y} AS_IF([test ${was_set_c_compiler_gnu}], [saved_c_compiler_gnu=$[ac_cv_c_compiler_gnu] AS_UNSET([[ac_cv_c_compiler_gnu]])]) AC_PROG_CC dnl Restore ac_cv_c_compiler_gnu AS_IF([test ${was_set_c_compiler_gnu}], [[ac_cv_c_compiler_gnu]=$[saved_c_compiler_gnu]]) _AC_COMPILER_EXEEXT _AC_COMPILER_OBJEXT AC_PROG_CPP dnl Restore the old definitions dnl popdef([cross_compiling])dnl popdef([am_cv_prog_cc_c_o])dnl popdef([am__fastdepCC_TRUE])dnl popdef([am__fastdepCC_FALSE])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([OBJEXT])dnl popdef([LDFLAGS])dnl popdef([EXEEXT])dnl popdef([CPPFLAGS])dnl popdef([CFLAGS])dnl popdef([GCC])dnl popdef([CPP])dnl popdef([CCDEPMODE])dnl popdef([CC])dnl popdef([ac_objext])dnl popdef([ac_exeext])dnl popdef([ac_cv_objext])dnl popdef([ac_cv_exeext])dnl popdef([ac_cv_c_compiler_gnu])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_c89])dnl popdef([ac_cv_prog_gcc])dnl popdef([ac_cv_prog_CPP])dnl dnl restore global variables ac_ext, ac_cpp, ac_compile, dnl ac_link, ac_compiler_gnu (dependant on the current dnl language after popping): AC_LANG_POP([C]) dnl Finally, set Makefile variables using the ac_cv_build_* variables dnl AC_SUBST(BUILD_EXEEXT)dnl AC_SUBST(BUILD_OBJEXT)dnl dnl Since autoconf 2.70, the call to AC_SUBST in the following lines dnl of _AC_COMPILER_EXEEXT dnl AC_SUBST([EXEEXT], [$ac_cv_exeext])dnl dnl ac_exeext=$EXEEXT dnl no longer sets BUILD_EXEEXT, but EXEEXT instead. dnl This means not only that BUILD_EXEEXT is not getting set, dnl but also that the original EXEEXT is overwritten dnl by a possibly different value. Furthermore, ac_build_exeext dnl is assigned an undefined value. dnl Restore EXEEXT to the original value and dnl set BUILD_EXEEXT and ac_build_exeext. dnl Similarly for _AC_COMPILER_OBJEXT and OBJEXT. m4_version_prereq([2.70],[dnl EXEEXT=$ac_cv_exeext BUILD_EXEEXT=$ac_cv_build_exeext; ac_build_exeext=$ac_cv_build_exeext OBJEXT=$ac_cv_objext BUILD_OBJEXT=$ac_cv_build_objext; ac_build_objext=$ac_cv_build_objext],[[]]) dnl Similarly to _AC_COMPILER_EXEEXT and _AC_COMPILER_OBJEXT, dnl the line dnl AC_SUBST([$1DEPMODE], [depmode=$am_cv_$1_dependencies_compiler_type]) dnl of _AM_DEPENDENCIES no longer sets CCDEPMODE_FOR_BUILD, dnl but overrides CCDEPMODE. dnl Restore CCDEPMODE and set CCDEPMODE_FOR_BUILD. AC_SUBST(CCDEPMODE_FOR_BUILD)dnl CCDEPMODE=depmode=$am_cv_CC_dependencies_compiler_type CCDEPMODE_FOR_BUILD=depmode=$am_cv_build_CC_dependencies_compiler_type AC_SUBST([CFLAGS_FOR_BUILD])dnl AC_SUBST([CPPFLAGS_FOR_BUILD])dnl AC_SUBST([LDFLAGS_FOR_BUILD])dnl ])