AC_DEFUN([TR_GCC_VERSION], [
  GCC_VERSION=""
  AS_IF([test "x$GCC" = "xyes"],[
    AS_IF([test "x$ax_gcc_version_option" != "xno"],[
      AC_CACHE_CHECK([gcc version],[ax_cv_gcc_version],[
        ax_cv_gcc_version="`$CC -dumpfullversion -dumpversion`"
        AS_IF([test "x$ax_cv_gcc_version" = "x"],[
          ax_cv_gcc_version=""
        ])
      ])
      GCC_VERSION=$ax_cv_gcc_version
    ])
  ])
  AC_SUBST([GCC_VERSION])
])