[Bug 255290] _POSIX_C_SOURCE=200809 hides static_assert

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255290

--- Comment #14 from Warner Losh <imp at FreeBSD.org> ---
_ISOC11_SOURCE appears to be a newer extension in glibc that could solve the
issue about what to do when compiling in C11 mode. glibc choses to enable this
by default, but it's unclear that's standard conformant. I'll see about adding
this feature test macro to FreeBSD to specify you also want isoc11 features.
That would be compatible with glibc and other systems, as well as being
something to fill in the gap before the open group updates posix to align it to
a newer version of C.

This would also preserve purely standards conforming programs that just happen
to be compiled with a c11 because the system default has changed, and be
minimally intrusive a change for code ported from other systems.

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