https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68023
David Barto <barto at cambridgesemantics dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|WAITING |RESOLVED Resolution|--- |WONTFIX --- Comment #5 from David Barto <barto at cambridgesemantics dot com> --- The code uses so many un-aligned access operations (legal in x86 code) that using -fsanitize=undefined causes the code to stop execution very early in the startup. If, after fixing this, the problem still exists, I'll be back to re-open the bug.