https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88462
--- Comment #17 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> --- > --- Comment #16 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot > Uni-Bielefeld.DE> --- [...] > Once I'd recompiled libphobos at -g3 -O0, the problem vanished, though. > I'll look closer and report my findings separately. Before going to bed, here are the gdc testresults for the -g3 -O0 libphobos (32 and 64-bit combined): === gdc Summary === # of expected passes 55351 # of unexpected failures 3109 # of unresolved testcases 256 # of unsupported tests 40 and for libphobos it's === libphobos Summary === # of expected passes 128 # of unexpected failures 53 I still had to kill off a couple of tests that were looping in calls to nanosleep. Will check in more detail later.