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Date: Sat, 6 Nov 2021 19:39:59 +0100
From: Joakim Sindholt <>
Subject: Re: add noexcept to all functions please

On Sat, Nov 06, 2021 at 06:28:31PM +0000, Jon Chesterfield wrote:
> That's a compiler bug, surely. A C function that takes no callbacks is not
> going to throw.

I don't think the compiler can prove that. As far as I know the extern
"C" {} that C headers get wrapped in for C++ just means the compiler
doesn't type-mangle function names. The function itself can not only
throw by itself but it can also call other functions that throw as part
of its implementation.

If there's a compiler bug here it would have to be that it discards
knowledge about C standard functions that can indeed not throw. I don't
know if that's the case here, or if it's just nonstandard functions that
are affected.

FWIW I don't think musl should tag any functions with anything just to
make C++ marginally faster. This seems like a case of C++ getting
hoisted by its own petard.

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