https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86690
--- Comment #3 from Joseph S. Myers <jsm28 at gcc dot gnu.org> --- Author: jsm28 Date: Fri Aug 3 15:25:35 2018 New Revision: 263294 URL: https://gcc.gnu.org/viewcvs?rev=263294&root=gcc&view=rev Log: Avoid infinite loop with duplicate anonymous union fields (PR c/86690). If a struct contains an anonymous union and both have a field with the same name, detect_field_duplicates_hash() will replace one of them with NULL. If compilation doesn't stop immediately, it may later call lookup_field() on the union, which falsely assumes the union's LANG_SPECIFIC array is sorted, and may loop indefinitely because of this. 2018-08-03 Bogdan Harjoc <har...@gmail.com> PR c/86690 gcc/c: * c-typeck.c (lookup_field): Do not use TYPE_LANG_SPECIFIC after errors. gcc/testsuite: * gcc.dg/union-duplicate-field.c: New test. Added: trunk/gcc/testsuite/gcc.dg/union-duplicate-field.c Modified: trunk/gcc/c/ChangeLog trunk/gcc/c/c-typeck.c trunk/gcc/testsuite/ChangeLog
