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Hmm, I'm not sure why the tests are failing,

also the comment on mcontext on the musl side,

    // GitHub repo: ifduyue/musl/
    // commit: b4b1e10364c8737a632be61582e05a8d3acf5690
    // file: arch/x86_64/bits/signal.h#L80-L84

is probably out of date now. Is that comment being parsed and used for testing? 🤔

☔ The latest upstream changes (presumably #1649) made this pull request unmergeable. Please resolve the merge conflicts.

@MarkMcCaskey Could you rebase to check CI?
r? @JohnTitor

I'm not sure if we could apply the same way as GNU since musl does a different way. At least, I think _libc_fpstate should be fpregset_t here.

I'm going to close this as inactive. Feel free to re-open if you have some time to resolve the above comment, thanks!