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# =========================================================================== | ||
# http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html | ||
# =========================================================================== | ||
# | ||
# SYNOPSIS | ||
# | ||
# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT]) | ||
# | ||
# DESCRIPTION | ||
# | ||
# Check whether the given FLAG works with the current language's compiler | ||
# 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 current language's default | ||
# flags (e.g. CFLAGS) when the check is done. The check is thus made with | ||
# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to | ||
# force the compiler to issue an error when a bad flag is given. | ||
# | ||
# INPUT gives an alternative input source to AC_COMPILE_IFELSE. | ||
# | ||
# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this | ||
# macro in sync with AX_CHECK_{PREPROC,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 4 | ||
|
||
AC_DEFUN([AX_CHECK_COMPILE_FLAG], | ||
[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF | ||
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl | ||
AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ | ||
ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS | ||
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" | ||
AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], | ||
[AS_VAR_SET(CACHEVAR,[yes])], | ||
[AS_VAR_SET(CACHEVAR,[no])]) | ||
_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags]) | ||
AS_VAR_IF(CACHEVAR,yes, | ||
[m4_default([$2], :)], | ||
[m4_default([$3], :)]) | ||
AS_VAR_POPDEF([CACHEVAR])dnl | ||
])dnl AX_CHECK_COMPILE_FLAGS |
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