hfinkel added a comment.
In https://reviews.llvm.org/D39611#918275, @spatel wrote:
> Patch updated:
> I don't know if we have agreement on the behavior that we want yet,
I just sent a note to the Austin group mailing list to see if the POSIX folks
agree with my reading. I'll follow up.
> but I'm updating the patch/description/title to only deal with <complex> in
> this patch and taking a shot at one interpretation, so we can see what that
> might look like.
>
> There are really 2 changes here:
>
> 1. We had all of <complex> marked constant all the time ('c'). I think
> there's agreement that can't be true by default (a platform could set errno
> on any of these calls based on the language in the C standard).
> 2. We make an exception for a GNU environment - here, the calls are always
> constant because the standard allows - and POSIX constrains - the errno
> setting behavior. This is despite the fact that glibc is known to set errno
> in some cases.
https://reviews.llvm.org/D39611
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