https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71744
--- Comment #29 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Author: jakub Date: Fri Sep 16 19:17:47 2016 New Revision: 240193 URL: https://gcc.gnu.org/viewcvs?rev=240193&root=gcc&view=rev Log: PR libgcc/71744 * unwind-dw2-fde.c (ATOMIC_FDE_FAST_PATH): Define if __register_frame* is not the primary registry and atomics are available. (any_objects_registered): New variable. (__register_frame_info_bases, __register_frame_info_table_bases): Atomically store 1 to any_objects_registered after registering first unwind info. (_Unwind_Find_FDE): Return early if any_objects_registered is 0. Modified: trunk/libgcc/ChangeLog trunk/libgcc/unwind-dw2-fde.c