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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/105562] std::function<bool(char)>::_M_invoker may be
 used uninitialized in std::regex move with -fno-strict-aliasing
Date: Wed, 11 May 2022 12:59:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105562

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #6)
> Created attachment 52953 [details]
> Precompiled testcase
>=20
> This .ii is based on the gcc-12 code, but with some tweaks to compile with
> gcc-10.

This a-re.ii warns with:

g++ a-re.ii -O1 -fno-strict-aliasing -Wsystem-headers -Wmaybe-uninitialized=