re PR middle-end/39659 (ICE building libstdc++v3 functexcept.cc)

	PR middle-end/39659
	* except.c (remove_unreachable_regions): Propagate may_contain_throw
	flag.

From-SVN: r145589

gcc/ChangeLog

+2009-04-06  Jan Hubicka  <jh@suse.cz>
+
+	PR middle-end/39659
+	* except.c (remove_unreachable_regions): Propagate may_contain_throw
+	flag.
+
 2009-04-06  Andrew Stubbs  <ams@codesourcery.com>
 
 	* config/sh/lib1funcs.asm (ic_invalidate): Move ICBI out of the

gcc/except.c

@@ -853,6 +853,7 @@ remove_unreachable_regions (sbitmap reachable, sbitmap contains_stmt)
 		     r->region_number,
 		     first_must_not_throw->region_number);
 	  remove_eh_handler_and_replace (r, first_must_not_throw);
+	  first_must_not_throw->may_contain_throw |= r->may_contain_throw;
 	}
       else
 	bring_to_root (r);