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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@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 8
  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 ])