https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81387
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> --- Just for curiosity, I tried to use clang++ 4.0.0 and clang++ pr81387.ii -c -O2 -fsanitize=undefined took me about 180s and memory was ~2.5GB.