https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100462
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |INVALID Status|UNCONFIRMED |RESOLVED --- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> --- <string> certainly contains lots of tokens, so you can't expect PCH to work after including that header. It needs to go before that.