[Bug libstdc++/81797] gcc 7.1.0 fails to build on macOS 10.13 (High Sierra):

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797

--- Comment #54 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
Thanks! Given that it affects bootstrap, maybe I ask that it be included in all
active branches?