# ===========================================================================
#             http://autoconf-archive.cryp.to/ax_gxx_version.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_GXX_VERSION
#
# DESCRIPTION
#
#   This macro retrieves the g++ version and returns it in the GXX_VERSION
#   variable if available, an empty string otherwise.
#
# LAST MODIFICATION
#
#   2008-04-12
#
# COPYLEFT
#
#   Copyright (c) 2008 Francesco Salvestrini <salvestrini@users.sourceforge.net>
#
#   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 2 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 Macro Archive. When you make and
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#   special exception to the GPL to apply to your modified version as well.

AC_DEFUN([AX_GXX_VERSION], [
  GXX_VERSION=""
  AX_GCC_OPTION([-dumpversion],[],[],[
    ax_gcc_version_option=yes
  ],[
    ax_gcc_version_option=no
  ])
  AS_IF([test "x$GXX" = "xyes"],[
    AS_IF([test "x$ax_gxx_version_option" != "no"],[
      AC_CACHE_CHECK([gxx version],[ax_cv_gxx_version],[
        ax_cv_gxx_version="`$CXX -dumpversion`"
        AS_IF([test "x$ax_cv_gxx_version" = "x"],[
          ax_cv_gxx_version=""
        ])
      ])
      GXX_VERSION=$ax_cv_gxx_version
    ])
  ])
  AC_SUBST([GXX_VERSION])
])