Summary: gcc 5.1 is still supported according to https://releases.llvm.org/10.0.0/docs/GettingStarted.html We're hitting the following bug due to a variable created in the loop header being the same as a variable used in the loop header: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54430 Reviewers: hctim, pcc Subscribers: #sanitizers Tags: #sanitizers Differential Revision: https://reviews.llvm.org/D81594