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Annotation of freem/m4/m4_ax_check_compile_flag.m4, revision 1.1

1.1     ! snw         1: # ===========================================================================
        !             2: #  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
        !             3: # ===========================================================================
        !             4: #
        !             5: # SYNOPSIS
        !             6: #
        !             7: #   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
        !             8: #
        !             9: # DESCRIPTION
        !            10: #
        !            11: #   Check whether the given FLAG works with the current language's compiler
        !            12: #   or gives an error.  (Warnings, however, are ignored)
        !            13: #
        !            14: #   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
        !            15: #   success/failure.
        !            16: #
        !            17: #   If EXTRA-FLAGS is defined, it is added to the current language's default
        !            18: #   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
        !            19: #   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
        !            20: #   force the compiler to issue an error when a bad flag is given.
        !            21: #
        !            22: #   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
        !            23: #
        !            24: #   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
        !            25: #   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
        !            26: #
        !            27: # LICENSE
        !            28: #
        !            29: #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
        !            30: #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
        !            31: #
        !            32: #   Copying and distribution of this file, with or without modification, are
        !            33: #   permitted in any medium without royalty provided the copyright notice
        !            34: #   and this notice are preserved.  This file is offered as-is, without any
        !            35: #   warranty.
        !            36: 
        !            37: #serial 11
        !            38: 
        !            39: AC_DEFUN([AX_CHECK_COMPILE_FLAG],
        !            40: [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
        !            41: AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
        !            42: AC_CACHE_CHECK([whether the _AC_LANG compiler accepts $1], CACHEVAR, [
        !            43:   ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
        !            44:   if test x"m4_case(_AC_LANG,
        !            45:                      [C], [$GCC],
        !            46:                      [C++], [$GXX],
        !            47:                      [Fortran], [$GFC],
        !            48:                      [Fortran 77], [$G77],
        !            49:                      [Objective C], [$GOBJC],
        !            50:                      [Objective C++], [$GOBJCXX],
        !            51:                      [no])" = xyes ; then
        !            52:     add_gnu_werror="-Werror"
        !            53:   fi
        !            54:   _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1 $add_gnu_werror"
        !            55:   AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
        !            56:     [AS_VAR_SET(CACHEVAR,[yes])],
        !            57:     [AS_VAR_SET(CACHEVAR,[no])])
        !            58:   _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
        !            59: AS_VAR_IF(CACHEVAR,yes,
        !            60:   [m4_default([$2], :)],
        !            61:   [m4_default([$3], :)])
        !            62: AS_VAR_POPDEF([CACHEVAR])dnl
        !            63: ])dnl AX_CHECK_COMPILE_FLAGS