[cfe-dev] Is it the time to mark coroutine status as green in cxx_status page?

[James Y Knight via cfe-dev]

There hasn't been a resolution for the issue where coroutine-lowering runs
optimizations passes before splitting, which breaks thread_local and
__attribute__((const)) functions (affecting e.g. pthread_self() and errno).
That's definitely a critical issue which must be resolved before coroutines
can be reasonably called "done".

See thread "[llvm-dev] [RFC] Coroutine and pthread_self" thread from a year
ago, e.g.
https://lists.llvm.org/pipermail/llvm-dev/2020-December/147325.html for the
end/summary of the conversation. (Or, starting at
https://lists.llvm.org/pipermail/llvm-dev/2020-November/146766.html and
https://lists.llvm.org/pipermail/llvm-dev/2020-December/147012.html)

Looks like there's a lot of open bugs about coroutines,
https://github.com/llvm/llvm-project/issues?q=is%3Aissue+is%3Aopen+coroutine
...might be worth going through all of them...
But, just cherry-picking a few about the above problem:
https://github.com/llvm/llvm-project/issues/47179 (with thread_local)
https://github.com/llvm/llvm-project/issues/47177 (with pthread_self)
https://github.com/llvm/llvm-project/issues/49257 (with errno)


On Mon, Dec 13, 2021 at 9:55 PM chuanqi.xcq via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hi,
>
>    I noticed that the status of coroutine in cxx_status page is partial
> previously: https://clang.llvm.org/cxx_status.html.
>    This looks weird to me since coroutine is used broadly and stably in
> practice and I want to mark it as green. So I tried
> to move coroutine out of the experimental namespace before and implement
> the semantics of throwing unhandled_exception()
> suggested by Lewis.
>    So I sent https://reviews.llvm.org/D115692 to mark coroutine as done.
> I want to ask if there is any blocking issue to do this?
> I would love to try to fix any inconsistency.
>
> Thanks,
> Chuanqi
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