https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63307
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to iverbin from comment #6) > Author: iverbin > Date: Mon Oct 20 15:22:09 2014 > New Revision: 216483 This breaks the build as wd->decl_map will always contain a BLOCK which does not have an UID. Please revert it as it is obvious you did not test it as a simple bootstrap (with checking enabled which is default on the trunk) would have found this issue.