https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80290
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Richard Biener from comment #1) > Seems to be caused by libstdc++ changes given g++ 7 preprocessed source uses > as much memory with g++ 5 as with 7 (even worse, at 12GB and still > compiling...) I doubt there's anything we can do to reduce it without losing standards conformance in some way, but I'll take a look and what changed.
