[Bug c/82787] gnu gcc (4.8 - 7.1) cannot parse some system headers in macOS (10.13)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82787

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The bug submission process asked you to read https://gcc.gnu.org/bugs/ which
says how to do it.