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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/100409] C++ FE elides pure throwing call
Date: Thu, 08 Jul 2021 09:41:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100409

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |101087

--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #10)
> (In reply to Richard Biener from comment #7)
> > Jason, any idea?
...=20
> which leaves us with
>=20
> FAIL: g++.dg/warn/noeffect4.C  -std=3Dgnu++98  (test for warnings, line 8=
4)
> FAIL: g++.dg/warn/noeffect4.C  -std=3Dgnu++14  (test for warnings, line 8=
4)
> FAIL: g++.dg/warn/noeffect4.C  -std=3Dgnu++17  (test for warnings, line 8=
4)
> FAIL: g++.dg/warn/noeffect4.C  -std=3Dgnu++2a  (test for warnings, line 8=
4)
>=20
> not diagnosing
>=20
>   sizeof (x++);                // { dg-warning "no effect" }
>=20
> not sure what should happen to the x++ side-effect (throwing).

Ah, that's likely PR101087


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101087
[Bug 101087] [9/10/11/12 Regression] Unevaluated operand of sizeof affects
noexcept operator=