From: Jonathan Wakely <jwakely@redhat.com>
To: "François Dumont" <frs.dumont@gmail.com>
Cc: "libstdc++" <libstdc++@gcc.gnu.org>,
gcc-patches <gcc-patches@gcc.gnu.org>,
rs2740@gmail.com
Subject: Re: [PATCH] [11/12/13/14 Regression] ABI break in _Hash_node_value_base since GCC 11 [PR 111050]
Date: Mon, 11 Sep 2023 12:51:18 +0100 [thread overview]
Message-ID: <CACb0b4=n+xy=uKAAO3OV=e_stpCaJfYFFHXfCYVAQgkwFngevQ@mail.gmail.com> (raw)
In-Reply-To: <bf02c66f-a911-8ce0-9249-45bef80b418c@gmail.com>
On Sun, 10 Sept 2023 at 14:57, François Dumont via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
>
> Following confirmation of the fix by TC here is the patch where I'm
> simply adding a 'constexpr' on _M_next().
>
> Please let me know this ChangeLog entry is correct. I would prefer this
> patch to be assigned to 'TC' with me as co-author but I don't know how
> to do such a thing. Unless I need to change my user git identity to do so ?
Sam already explained that, but please check with Tim how he wants to
be credited, if at all. He doesn't have a copyright assignment, and
hasn't added a DCO sign-off to the patch, but it's small enough to not
need it as this is the first contribution credited to him.
>
> libstdc++: Add constexpr qualification to _Hash_node::_M_next()
What has this constexpr addition got to do with the ABI change and the
always_inline attributes?
It certainly doesn't seem like it should be the summary line of the
git commit message.
>
> https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=1b6f0476837205932613ddb2b3429a55c26c409d
> changed _Hash_node_value_base to no longer derive from
> _Hash_node_base, which means
> that its member functions expect _M_storage to be at a different
> offset. So explosions
> result if an out-of-line definition is emitted for any of the
> member functions (say,
> in a non-optimized build) and the resulting object file is then
> linked with code built
> using older version of GCC/libstdc++.
>
> libstdc++-v3/ChangeLog:
>
> * include/bits/hashtable_policy.h
> (_Hash_node_value_base<>::_M_valptr(),
> _Hash_node_value_base<>::_M_v())
> Add [[__gnu__::__always_inline__]].
> (_Hash_node<>::_M_next()): Add constexpr.
>
> Co-authored-by: TC <rs2740@gmail.com>
>
> Ok to commit and backport to GCC 11, 12, 13 branches ?
>
> François
>
next prev parent reply other threads:[~2023-09-11 11:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-10 13:56 François Dumont
2023-09-10 15:36 ` Sam James
2023-09-11 11:51 ` Jonathan Wakely [this message]
2023-09-11 17:19 ` François Dumont
2023-09-12 16:09 ` Jonathan Wakely
2023-09-14 4:46 ` François Dumont
2023-09-27 4:44 ` François Dumont
2023-09-28 16:18 ` Jonathan Wakely
2023-09-28 17:25 ` François Dumont
2023-09-29 9:53 ` Jonathan Wakely
2023-10-02 20:51 ` François Dumont
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