[Bug 276743] Many SIG* macros in <signal.h> are not visible with _POSIX_C_SOURCE

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276743

--- Comment #5 from Jan Beich <jbeich@FreeBSD.org> ---
(In reply to Mark Johnston from comment #4)
> comment 3 explains why this is arguably not a FreeBSD bug,

Indeed. I've confirmed SIGTRAP is XSI by looking at POSIX drafts on
open-std.org. Given SIGSYS is XSI but FreeBSD makes it visible in POSIX I
wouldn't emphasize "strictly".

> is there anything else to do?

Need to report to wlmaker upstream as it'd may manifest on their CI.

> Are other ports affected by this?

I didn't check. Removing -D_POSIX_C_SOURCE is very common in ports/, sometimes
such hacks are upstreamed.

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