[Bug c/115539] Misoptimization of application at -O2 -g on x86-64 causing segfaults on valid memory accesses where it works on both clang and gcc at -g (no -O2)

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115539

--- Comment #6 from Sam James <sjames at gcc dot gnu.org> ---
(In reply to Sam James from comment #5)
> fastreadl_fetch in particular looks aliasing unsafe, let alone the rest.

The code looks derived from 86box or similar. They build with
-fno-strict-aliasing:
https://github.com/86Box/86Box/blob/15d2ee28c7d7f4590f1f69c542081cdb78313b91/cmake/flags-gcc.cmake#L18.

You should be building with it too if using code derived from it.