blob: ca3639715e7243fa4343eb2e7f3de53927cc9d4a [file] [log] [blame]
cristya32d1812012-03-02 19:24:21 +00001# ===========================================================================
2# http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
cristy17491be2014-06-24 01:10:53 +00007# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
cristya32d1812012-03-02 19:24:21 +00008#
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#
cristy17491be2014-06-24 01:10:53 +000022# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
23#
cristya32d1812012-03-02 19:24:21 +000024# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
25# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
26#
27# LICENSE
28#
29# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
30# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
31#
32# This program is free software: you can redistribute it and/or modify it
33# under the terms of the GNU General Public License as published by the
34# Free Software Foundation, either version 3 of the License, or (at your
35# option) any later version.
36#
37# This program is distributed in the hope that it will be useful, but
38# WITHOUT ANY WARRANTY; without even the implied warranty of
39# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
40# Public License for more details.
41#
42# You should have received a copy of the GNU General Public License along
43# with this program. If not, see <http://www.gnu.org/licenses/>.
44#
45# As a special exception, the respective Autoconf Macro's copyright owner
46# gives unlimited permission to copy, distribute and modify the configure
47# scripts that are the output of Autoconf when processing the Macro. You
48# need not follow the terms of the GNU General Public License when using
49# or distributing such scripts, even though portions of the text of the
50# Macro appear in them. The GNU General Public License (GPL) does govern
51# all other use of the material that constitutes the Autoconf Macro.
52#
53# This special exception to the GPL applies to versions of the Autoconf
54# Macro released by the Autoconf Archive. When you make and distribute a
55# modified version of the Autoconf Macro, you may extend this special
56# exception to the GPL to apply to your modified version as well.
57
cristy146497a2015-05-17 22:46:16 +000058#serial 4
cristya32d1812012-03-02 19:24:21 +000059
60AC_DEFUN([AX_CHECK_COMPILE_FLAG],
cristy146497a2015-05-17 22:46:16 +000061[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
cristya32d1812012-03-02 19:24:21 +000062AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
63AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
64 ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
65 _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
cristy17491be2014-06-24 01:10:53 +000066 AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
cristya32d1812012-03-02 19:24:21 +000067 [AS_VAR_SET(CACHEVAR,[yes])],
68 [AS_VAR_SET(CACHEVAR,[no])])
69 _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
cristy146497a2015-05-17 22:46:16 +000070AS_VAR_IF(CACHEVAR,yes,
cristya32d1812012-03-02 19:24:21 +000071 [m4_default([$2], :)],
72 [m4_default([$3], :)])
73AS_VAR_POPDEF([CACHEVAR])dnl
74])dnl AX_CHECK_COMPILE_FLAGS