https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66241
--- Comment #3 from Vidya Praveen <vp at gcc dot gnu.org> --- And this change seems to be the cause: Author: hubicka Date: Sat May 16 20:51:50 2015 New Revision: 223252 URL: https://gcc.gnu.org/viewcvs?rev=223252&root=gcc&view=rev Log: * tree.c (verify_type_variant): Verify tree_base and type_common flags. (verify_type): Verify STRING_FLAG. Modified: trunk/gcc/ChangeLog trunk/gcc/tree.c