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      1 # ===========================================================================
      2 #      http://www.gnu.org/software/autoconf-archive/ax_gcc_version.html
      3 # ===========================================================================
      4 #
      5 # SYNOPSIS
      6 #
      7 #   AX_GCC_VERSION
      8 #
      9 # DESCRIPTION
     10 #
     11 #   This macro retrieves the gcc version and returns it in the GCC_VERSION
     12 #   variable if available, an empty string otherwise.
     13 #
     14 # LICENSE
     15 #
     16 #   Copyright (c) 2009 Francesco Salvestrini <salvestrini (a] 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 
     44 #serial 7
     45 
     46 AC_DEFUN([AX_GCC_VERSION], [
     47   GCC_VERSION=""
     48   AX_GCC_OPTION([-dumpversion],[],[],[
     49     ax_gcc_version_option=yes
     50   ],[
     51     ax_gcc_version_option=no
     52   ])
     53   AS_IF([test "x$GCC" = "xyes"],[
     54     AS_IF([test "x$ax_gcc_version_option" != "xno"],[
     55       AC_CACHE_CHECK([gcc version],[ax_cv_gcc_version],[
     56         ax_cv_gcc_version="`$CC -dumpversion`"
     57         AS_IF([test "x$ax_cv_gcc_version" = "x"],[
     58           ax_cv_gcc_version=""
     59         ])
     60       ])
     61       GCC_VERSION=$ax_cv_gcc_version
     62     ])
     63   ])
     64   AC_SUBST([GCC_VERSION])
     65 ])
     66