https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83531
MCCCS <mcccs at gmx dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mcccs at gmx dot com --- Comment #2 from MCCCS <mcccs at gmx dot com> --- The issue is caused by `os/availability.h` or `AvailabilityInternal.h`. Instead of `API_AVAILABLE`, only `__API_AVAILABLE` is defined (Clang defines both) This is also the cause of a few failing tests (g++.dg/other/darwin-cfstring1.C for example)