+dnl Usage: TL_AC_GCC_VERSION(TOPSRCDIR)
+dnl
+dnl Set up the variables:
+dnl
+dnl gcc_version_trigger: pathname of gcc's version.c, if available
+dnl gcc_version_full: full gcc version string
+dnl gcc_version: the first "word" in $gcc_version_full
+dnl
+dnl TOPSRCDIR is the top-level source directory.
+AC_DEFUN([TL_AC_GCC_VERSION],
+[
+changequote(,)dnl
+if test "${with_gcc_version_trigger+set}" = set; then
+ gcc_version_trigger=$with_gcc_version_trigger
+else
+ gcc_version_trigger=$1/gcc/version.c
+fi
+if test -f "${gcc_version_trigger}"; then
+ gcc_version_full=`grep version_string "${gcc_version_trigger}" | sed -e 's/.*"\([^"]*\)".*/\1/'`
+else
+ gcc_version_full=`$CC -v 2>&1 | sed -n 's/^gcc version //p'`
+fi
+gcc_version=`echo ${gcc_version_full} | sed -e 's/\([^ ]*\) .*/\1/'`
+changequote([,])dnl
+AC_SUBST(gcc_version_trigger)
+AC_SUBST(gcc_version_full)
+AC_SUBST(gcc_version)
+])dnl