https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89619
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |compile-time-hog Status|UNCONFIRMED |NEW Last reconfirmed| |2019-03-07 Ever confirmed|0 |1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- It terminates just fine for me - it's just a "bit" slow. GCC 8 is way faster. > /usr/bin/time /space/rguenther/install/gcc-7.3/bin/g++ t.C -O 61.43user 0.06system 1:01.50elapsed 99%CPU (0avgtext+0avgdata 142964maxresident)k 0inputs+1016outputs (0major+55908minor)pagefaults 0swaps The issue is the initializer is unrolled in GCC 7 while it is a loop in later releases. IIRC there was a C++ FE bug fixed, but not a regression, so it probably won't be backported.