[Bug 293859] C11's call_once requires nonstandard library -lstdthreads for linking

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293859

--- Comment #9 from Matthias Andree <[email protected]> ---
I was thinking along the lines of
https://learn.microsoft.com/en-us/cpp/preprocessor/comment-c-cpp?view=msvc-170's
#pragma comment (which Boost would also use there), but I am also not aware of
FreeBSD- or Linux- typical software supporting this.

The Open Group Base Specifiations Issue 8 (2024) suggests that applications for
POSIX systems should prefer the pthreads.h implementations over threads.h to
avoid extra transition if they later wanted pthreads.h features missing from
threads.h.

These specs also document a "c17" utility that should make <threads.h> symbols
available through -lpthread.  Yes, that may pose interesting compatibility
problems to FreeBSD because its thread history from way back when with -lthr
and stuff.

(OpenEXR does not request this utility nor C17 as standards version from the
compiler, it'll make do with a C11-enabled compiler.)

It would be nice if FreeBSD could, medium term, get closer to what other
systems do to ease portability, but the cursory search in FreeBSD's Bugzilla
only came up with 292622 as the other case.  I presume C11 threads.h isn't in
widespread use (yet).

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