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Annotation of embedaddon/sudo/m4/ax_check_compile_flag.m4, revision 1.1.1.1

1.1       misho       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