https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66194
--- Comment #2 from Evgeniy Dushistov <dushistov at mail dot ru> --- (In reply to H.J. Lu from comment #1) > Which gcc did you use? Please provide a run-time test. I try gcc 4.6.4, 4.7.4, 4.9.2, 5.1.0. If you compile attachment on linux/amd64 and run: ./thash then it give segfault with all versions.