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Backport fix from bakefile svn for autoconf 2.65.
[wxWidgets.git] / build / aclocal / ax_gxx_version.m4
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1# ===========================================================================
2# http://autoconf-archive.cryp.to/ax_gxx_version.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7# AX_GXX_VERSION
8#
9# DESCRIPTION
10#
11# This macro retrieves the g++ version and returns it in the GXX_VERSION
12# variable if available, an empty string otherwise.
13#
14# LAST MODIFICATION
15#
16# 2008-04-12
17#
18# COPYLEFT
19#
20# Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
21#
22# This program is free software; you can redistribute it and/or modify it
23# under the terms of the GNU General Public License as published by the
24# Free Software Foundation; either version 2 of the License, or (at your
25# option) any later version.
26#
27# This program is distributed in the hope that it will be useful, but
28# WITHOUT ANY WARRANTY; without even the implied warranty of
29# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
30# Public License for more details.
31#
32# You should have received a copy of the GNU General Public License along
33# with this program. If not, see <http://www.gnu.org/licenses/>.
34#
35# As a special exception, the respective Autoconf Macro's copyright owner
36# gives unlimited permission to copy, distribute and modify the configure
37# scripts that are the output of Autoconf when processing the Macro. You
38# need not follow the terms of the GNU General Public License when using
39# or distributing such scripts, even though portions of the text of the
40# Macro appear in them. The GNU General Public License (GPL) does govern
41# all other use of the material that constitutes the Autoconf Macro.
42#
43# This special exception to the GPL applies to versions of the Autoconf
44# Macro released by the Autoconf Macro Archive. When you make and
45# distribute a modified version of the Autoconf Macro, you may extend this
46# special exception to the GPL to apply to your modified version as well.
47
48AC_DEFUN([AX_GXX_VERSION], [
49 GXX_VERSION=""
50 AX_GCC_OPTION([-dumpversion],[],[],[
51 ax_gcc_version_option=yes
52 ],[
53 ax_gcc_version_option=no
54 ])
55 AS_IF([test "x$GXX" = "xyes"],[
56 AS_IF([test "x$ax_gxx_version_option" != "no"],[
57 AC_CACHE_CHECK([gxx version],[ax_cv_gxx_version],[
58 ax_cv_gxx_version="`$CXX -dumpversion`"
59 AS_IF([test "x$ax_cv_gxx_version" = "x"],[
60 ax_cv_gxx_version=""
61 ])
62 ])
63 GXX_VERSION=$ax_cv_gxx_version
64 ])
65 ])
66 AC_SUBST([GXX_VERSION])
67])