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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103991] [12 Regression] Bogus -Wreturn-type with constexpr
 if and local var with destructor
Date: Wed, 12 Jan 2022 20:02:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103991

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #7)
> > Now, as Richi's warning isn't in GCC 12, quickest/safest temporary fix =
would be
> > to revert to previous behavior for IF_STMT_CONSTEXPR_P and IF_STMT_CONS=
TEVAL_P,
> >  if (IF_STMT_CONSTEVAL_P (stmt))
> >    stmt =3D else_;
> >  else if (IF_STMT_CONSTEXPR_P (stmt))
> >    stmt =3D integer_nonzerop (cond) ? then_ ? else_;
> >  else
> >    stmt =3D build3 (COND_EXPR, void_type_node, cond, then_, else_);
>=20
> I agree that reverting for GCC 12 is the most reasonable thing with addin=
g a
> Testcase

The above isn't a full reversion, it keeps the normal if (which isn't
problematic) as is and just reverts behavior for the special const{expr,eva=
l}
ifs.=