https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80007
--- Comment #6 from PeteVine <tulipawn at gmail dot com> --- Turns out it's a miscompilation bug as I was using the same set of C(XX)FLAGS that work fine for those other languages. Removing the -fomit-frame-pointer flag while leaving the rest unchanged (-O3 -mtune=cortex-a57 -fipa-pta -march=armv8-a+crc) fixes the issue.
