https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100799
--- Comment #11 from Alexander Grund <alexander.gr...@tu-dresden.de> --- Some more experiments with GCC 10.3, OpenBLAS 0.3.15 and FlexiBLAS 3.0.4: Baseline: Broken at -O1, working at -Og I got it to break with "-Og -fmove-loop-invariants". Then it worked again by adding "-fstack-protector-all". But that is seemingly not advisable: https://developers.redhat.com/blog/2020/05/22/stack-clash-mitigation-in-gcc-part-3 Hence the current workaround is to use "-O2 -fno-move-loop-invariants"
