git / moonbite-core / build-aux/m4/ax_check_preproc_flag.m4 · raw

# ===========================================================================#   http://www.gnu.org/software/autoconf-archive/ax_check_preproc_flag.html# ===========================================================================## SYNOPSIS##   AX_CHECK_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])## DESCRIPTION##   Check whether the given FLAG works with the current language's#   preprocessor or gives an error.  (Warnings, however, are ignored)##   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on#   success/failure.##   If EXTRA-FLAGS is defined, it is added to the preprocessor's default#   flags when the check is done.  The check is thus made with the flags:#   "CPPFLAGS EXTRA-FLAGS FLAG".  This can for example be used to force the#   preprocessor to issue an error when a bad flag is given.##   INPUT gives an alternative input source to AC_PREPROC_IFELSE.##   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this#   macro in sync with AX_CHECK_{COMPILE,LINK}_FLAG.## LICENSE##   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>##   This program is free software: you can redistribute it and/or modify it#   under the terms of the GNU General Public License as published by the#   Free Software Foundation, either version 3 of the License, or (at your#   option) any later version.##   This program is distributed in the hope that it will be useful, but#   WITHOUT ANY WARRANTY; without even the implied warranty of#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General#   Public License for more details.##   You should have received a copy of the GNU General Public License along#   with this program. If not, see <http://www.gnu.org/licenses/>.##   As a special exception, the respective Autoconf Macro's copyright owner#   gives unlimited permission to copy, distribute and modify the configure#   scripts that are the output of Autoconf when processing the Macro. You#   need not follow the terms of the GNU General Public License when using#   or distributing such scripts, even though portions of the text of the#   Macro appear in them. The GNU General Public License (GPL) does govern#   all other use of the material that constitutes the Autoconf Macro.##   This special exception to the GPL applies to versions of the Autoconf#   Macro released by the Autoconf Archive. When you make and distribute a#   modified version of the Autoconf Macro, you may extend this special#   exception to the GPL to apply to your modified version as well.#serial 4AC_DEFUN([AX_CHECK_PREPROC_FLAG],[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IFAS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]cppflags_$4_$1])dnlAC_CACHE_CHECK([whether _AC_LANG preprocessor accepts $1], CACHEVAR, [  ax_check_save_flags=$CPPFLAGS  CPPFLAGS="$CPPFLAGS $4 $1"  AC_PREPROC_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],    [AS_VAR_SET(CACHEVAR,[yes])],    [AS_VAR_SET(CACHEVAR,[no])])  CPPFLAGS=$ax_check_save_flags])AS_VAR_IF(CACHEVAR,yes,  [m4_default([$2], :)],  [m4_default([$3], :)])AS_VAR_POPDEF([CACHEVAR])dnl])dnl AX_CHECK_PREPROC_FLAGS