https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67066
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED Target Milestone|--- |6.0 --- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> --- Fixed on trunk. The filesystem library is now enabled on the gcc-5-branch too, but I'm not making this change there. Just don't use --enable-concept-checks in combination with the filesystem library (better yet, don't use --enable-concept-checks at all).