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    1: # ===========================================================================
    2: #   http://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])
    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: #   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
   23: #   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
   24: #
   25: # LICENSE
   26: #
   27: #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
   28: #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
   29: #
   30: #   This program is free software: you can redistribute it and/or modify it
   31: #   under the terms of the GNU General Public License as published by the
   32: #   Free Software Foundation, either version 3 of the License, or (at your
   33: #   option) any later version.
   34: #
   35: #   This program is distributed in the hope that it will be useful, but
   36: #   WITHOUT ANY WARRANTY; without even the implied warranty of
   37: #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
   38: #   Public License for more details.
   39: #
   40: #   You should have received a copy of the GNU General Public License along
   41: #   with this program. If not, see <http://www.gnu.org/licenses/>.
   42: #
   43: #   As a special exception, the respective Autoconf Macro's copyright owner
   44: #   gives unlimited permission to copy, distribute and modify the configure
   45: #   scripts that are the output of Autoconf when processing the Macro. You
   46: #   need not follow the terms of the GNU General Public License when using
   47: #   or distributing such scripts, even though portions of the text of the
   48: #   Macro appear in them. The GNU General Public License (GPL) does govern
   49: #   all other use of the material that constitutes the Autoconf Macro.
   50: #
   51: #   This special exception to the GPL applies to versions of the Autoconf
   52: #   Macro released by the Autoconf Archive. When you make and distribute a
   53: #   modified version of the Autoconf Macro, you may extend this special
   54: #   exception to the GPL to apply to your modified version as well.
   55: 
   56: #serial 2
   57: 
   58: AC_DEFUN([AX_CHECK_COMPILE_FLAG],
   59: [AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
   60: AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
   61: AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
   62:   ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
   63:   _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
   64:   AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
   65:     [AS_VAR_SET(CACHEVAR,[yes])],
   66:     [AS_VAR_SET(CACHEVAR,[no])])
   67:   _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
   68: AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
   69:   [m4_default([$2], :)],
   70:   [m4_default([$3], :)])
   71: AS_VAR_POPDEF([CACHEVAR])dnl
   72: ])dnl AX_CHECK_COMPILE_FLAGS
   73: