diff options
Diffstat (limited to 'build-aux/m4/ax_check_preproc_flag.m4')
| -rw-r--r-- | build-aux/m4/ax_check_preproc_flag.m4 | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/build-aux/m4/ax_check_preproc_flag.m4 b/build-aux/m4/ax_check_preproc_flag.m4 new file mode 100644 index 0000000000..b1cfef6b86 --- /dev/null +++ b/build-aux/m4/ax_check_preproc_flag.m4 @@ -0,0 +1,72 @@ +# =========================================================================== +# http://www.gnu.org/software/autoconf-archive/ax_check_preproc_flag.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_CHECK_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS]) +# +# 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. +# +# 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 2 + +AC_DEFUN([AX_CHECK_PREPROC_FLAG], +[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX +AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]cppflags_$4_$1])dnl +AC_CACHE_CHECK([whether _AC_LANG preprocessor accepts $1], CACHEVAR, [ + ax_check_save_flags=$CPPFLAGS + CPPFLAGS="$CPPFLAGS $4 $1" + AC_PREPROC_IFELSE([AC_LANG_PROGRAM()], + [AS_VAR_SET(CACHEVAR,[yes])], + [AS_VAR_SET(CACHEVAR,[no])]) + CPPFLAGS=$ax_check_save_flags]) +AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes], + [m4_default([$2], :)], + [m4_default([$3], :)]) +AS_VAR_POPDEF([CACHEVAR])dnl +])dnl AX_CHECK_PREPROC_FLAGS |