+AC_DEFUN(STEPMAKE_GXXCODEGENBUG, [
+ AC_MSG_CHECKING([options for known g++ tail call bug])
+ case "$GXX:$CXX_VERSION" in
+ yes:400600?)
+ AC_MSG_RESULT([-fno-optimize-sibling-calls])
+ CXXFLAGS="$CXXFLAGS -fno-optimize-sibling-calls"
+ ;;
+ *) AC_MSG_RESULT([none])
+ esac
+ AC_SUBST(CXXFLAGS)
+])
+