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Subject: [Bug target/102772] [12 regression] g++.dg/torture/pr80334.C FAILs
Date: Thu, 31 Mar 2022 14:16:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102772

--- Comment #39 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #37)
>   AFAICS, alignof is C++ >=3D 11 only.  I've used the attached patch to
>   use __alignof__ instead, although I don't know if that's the best fix.

Yes, alignof is C++11 only, but the reason it's OK to use there is that
__STDCPP_DEFAULT_NEW_ALIGNMENT__ is C++17 only, and alignof is guarded by:

#if __cpp_aligned_new
        if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__)

Strictly speaking, this code is enabled when -faligned-new is active, which=
 is
true for C++17 by default.

It appears that Jakub's patch makes -faligned-new always active for Solaris
x86, which we don't want.=