[Bug libstdc++/89464] shared_ptr_base.h: error: '__tag' was not declared in this scope (gcc-8.3.0 regression?)

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89464

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The problem is in https://github.com/Silicondust/libhdhomerun:
hdhomerun_os_posix.h
Which does:
#if !defined(alignas)
#define alignas(n) __attribute__((aligned(n)))
#endif


That is wrong.