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From: "unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/103726] --disable-hosted-libstdcxx (freestanding C++)
 does not provide <coroutine> as what standard requires
Date: Tue, 11 Jan 2022 04:13:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103726

--- Comment #10 from cqwrteur <unlvsur at live dot com> ---
(In reply to Jonathan Wakely from comment #9)
> Ah it was left out of libstdc++'s freestanding builds intentionally:
>=20
> > When the final <coroutines> header is added it will need to be in
> > libsupc++ so that it's included for freestanding builds (and at that
> > point it won't be able to use <bits/stl_function.h>, but that will be
> > OK as the final header will be C++20-only and can rely on <compare>
> > unconditionally, which is also freestanding).
>=20
> The current experimental implementation supports C++14 and C++17, but to =
do
> that it needs to include some non-freestanding stuff.

then we need to report to wg21 as defects. Removing exception, typeinfo and
coroutines from freestanding for example.=