https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115345
--- Comment #11 from Djordje Baljozovic <djordje.baljozovic at ac dot rwth-aachen.de> --- (In reply to Djordje Baljozovic from comment #9) > (In reply to Andrew Pinski from comment #7) > > A few questions, does `-fsanitize=undefined -fsanitize=address` report > > anything? Does it work at -O0 and not just -O3? Does adding > > -fno-strict-aliasing to the command line "fix" the crash? Are there any > > warnings with `-Wextra -Wall` that might be causing an issue? > > Have not tested -O0 and -fno-strict-aliasing; will let you know if this > fixed the problem. > No warnings with -Wextra -Wall to my knowledge. > > Sincerely, > George Hi Andrew and Jakub, The results are more than interesting: 1. -fno-strict-aliasing: none of the inputs processed (with O3) 2. O0: all but one input processed 3. O3: none of the inputs processed 4. O1 and O2: all inputs processed without any issues -- this did it. Now the question is: how on Earth did O1/O2 do the trick, and not O0?! Once again, thanks a lot for your detailed and quick responses. George P.S. I will keep @Jakub's bisect idea in mind if something like this happens in the future.
