[Bug 274927] Toolchain fails on the __sync_val_compare_and_swap function without -march=native (port biology/seqwish)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274927

--- Comment #9 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Dimitry Andric from comment #8)

Interesting.

I'll note that the likes of -march=x86-64-v2 was added in 2020-Oct
for gcc/g++ and clang/clang++ so older notes would not reference
the possibility.

It is associated with:

https://gitlab.com/x86-psABIs/x86-64-ABI/-/commit/77566eb03bc6a326811cb7e9a6b9396884b67c7c

For all I know it may have the same issues for lock free code
in the tool chains.

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