build/aclocal/ax_gxx_version.m4

   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
  48 AC_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 ])