configure.ac : Report useful info at the end of configure.
diff --git a/m4/gcc_version.m4 b/m4/gcc_version.m4
new file mode 100644
index 0000000..d1bae6a
--- /dev/null
+++ b/m4/gcc_version.m4
@@ -0,0 +1,33 @@
+dnl @synopsis XIPH_GCC_VERSION
+dnl
+dnl Find the version of gcc.
+dnl @version 1.0 Nov 05 2007
+dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
+dnl
+dnl Permission to use, copy, modify, distribute, and sell this file for any
+dnl purpose is hereby granted without fee, provided that the above copyright
+dnl and this permission notice appear in all copies. No representations are
+dnl made about the suitability of this software for any purpose. It is
+dnl provided "as is" without express or implied warranty.
+dnl
+
+AC_DEFUN([XIPH_GCC_VERSION],
+[
+if test "x$ac_cv_c_compiler_gnu" = "xyes" ; then
+
+ AC_MSG_CHECKING([for version of $CC])
+ GCC_VERSION=`$CC -dumpversion`
+ AC_MSG_RESULT($GCC_VERSION)
+
+ changequote(,)dnl
+ GCC_MINOR_VERSION=`echo $GCC_VERSION | sed "s/^[0-9]\+\.//" | sed "s/\..*//"`
+ GCC_MAJOR_VERSION=`echo $GCC_VERSION | sed "s/\..*//"`
+ changequote([,])dnl
+ fi
+
+AC_SUBST(GCC_VERSION)
+AC_SUBST(GCC_MAJOR_VERSION)
+AC_SUBST(GCC_MINOR_VERSION)
+
+])# XIPH_GCC_VERSION
+