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