https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82284 --- Comment #5 from Matthias Klose <doko at gcc dot gnu.org> --- I checked with trunk 20170917, but I backported your patch for PR sanitizer/77631 to the gcc-7-branch. I'm building current trunk now. So sthis is a 8, not 7 regression.