Macro: ac_prog_cc_for_build

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Synopsis

  `AC_PROG_CC_FOR_BUILD`

Version

  1.1.1.1 (2001/07/26) Cross_Compilation @ ac-archive-0.5.39

Author

  Paolo Bonzini <bonzini@gnu.org>

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.

M4 Source Code

      AC_DEFUN([AC_PROG_CC_FOR_BUILD], [dnl
      AC_REQUIRE([AC_PROG_CC])dnl
      AC_REQUIRE([AC_PROG_CPP])dnl
      AC_REQUIRE([AC_EXEEXT])dnl
      AC_REQUIRE([AC_CANONICAL_SYSTEM])dnl
      dnl
      pushdef([AC_TRY_COMPILER], [
      cat > conftest.$ac_ext << EOF
      #line __oline__ "configure"
      #include "confdefs.h"
      [$1]
      EOF
      # If we can't run a trivial program, we are probably using a cross
      compiler.
      # Fail miserably.
      if AC_TRY_EVAL(ac_link) && test -s conftest${ac_exeext} && (./conftest;
      exit) 2>/dev/null; then
        [$2]=yes
      else
        echo "configure: failed program was:" >&AC_FD_CC
        cat conftest.$ac_ext >&AC_FD_CC
        [$2]=no
      fi
      [$3]=no
      rm -fr conftest*])dnl

      dnl Use the standard macros, but make them use other variable names
      dnl
      pushdef([cross_compiling], [#])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_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_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([CPP], CPP_FOR_BUILD)dnl
      pushdef([CFLAGS], CFLAGS_FOR_BUILD)dnl
      pushdef([CPPFLAGS], CPPFLAGS_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_cpp], ac_build_cpp)dnl
      pushdef([ac_compile], ac_build_compile)dnl
      pushdef([ac_link], ac_build_link)dnl

      dnl Defeat the anti-duplication mechanism
      dnl
      undefine([AC_PROVIDE_AC_PROG_CPP])dnl
      undefine([AC_PROVIDE_AC_PROG_C])dnl
      undefine([AC_PROVIDE_AC_EXEEXT])dnl

      AC_PROG_CC
      AC_PROG_CPP
      AC_EXEEXT

      dnl Restore the old definitions
      dnl
      popdef([AC_TRY_COMPILER])dnl
      popdef([ac_link])dnl
      popdef([ac_compile])dnl
      popdef([ac_cpp])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([CPPFLAGS])dnl
      popdef([CFLAGS])dnl
      popdef([CPP])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_prog_cc_g])dnl
      popdef([ac_cv_prog_cc_works])dnl
      popdef([ac_cv_prog_cc_cross])dnl
      popdef([ac_cv_prog_gcc])dnl
      popdef([ac_cv_prog_cc])dnl
      popdef([cross_compiling])dnl

      dnl Finally, set Makefile variables
      dnl
      BUILD_EXEEXT=$ac_build_exeext
      BUILD_OBJEXT=$ac_build_objext
      AC_SUBST(BUILD_EXEEXT)dnl
      AC_SUBST(BUILD_OBJEXT)dnl
      AC_SUBST([CFLAGS_FOR_BUILD])dnl
      AC_SUBST([CPPFLAGS_FOR_BUILD])dnl
      ])