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

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

--- Comment #8 from Konstantin Belousov <[email protected]> ---
(In reply to Matthias Andree from comment #7)
I am not aware of any feature in ld.bfd/lld/mold that would allow source file
to affect the linker command line to include some library into the linking set.

But even if there were some, it is IMO wrong to automatically link with
libstdthreads because it would bring libthr into the image, which significantly
changes the mode of operations for the C runtime.

The fact that functions implemented in libstdthreads are specified in C
standard
does not make it reasonable to link it in.  There are functions specified in
the
standard that are exported from libm, and -lm is required when math functions
are used.  -lstdthreads has valid important technical reasons to be separate
lib and abstain from being merged into libc or linked in always.

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