From: Jonathan Wakely <jwakely@redhat.com>
To: "François Dumont" <frs.dumont@gmail.com>
Cc: "libstdc++@gcc.gnu.org" <libstdc++@gcc.gnu.org>
Subject: Re: [PATCH] Fix inline versioned namespace bootstrap
Date: Sat, 28 Aug 2021 14:38:27 +0100 [thread overview]
Message-ID: <CACb0b4m4uDVrUnOhJMEma3fYZi3UFd9WA=zXztKAyvU_1x+UTA@mail.gmail.com> (raw)
In-Reply-To: <7085cd0a-c765-7971-ef81-0db8fe7f13fd@gmail.com>
On Sat, 28 Aug 2021 at 13:40, François Dumont <frs.dumont@gmail.com> wrote:
>
> On 28/08/21 12:49 pm, Jonathan Wakely wrote:
> > On Sat, 28 Aug 2021 at 10:26, Jonathan Wakely <jwakely@redhat.com> wrote:
> >> On Fri, 27 Aug 2021 at 22:17, Jonathan Wakely <jwakely@redhat.com> wrote:
> >>> On Fri, 27 Aug 2021 at 21:58, François Dumont via Libstdc++
> >>> <libstdc++@gcc.gnu.org> wrote:
> >>>> Since std::allocator<void> is not specialized anymore in
> >>>> _GLIBCXX_INLINE_VERSION mode _ExtPtr_allocator<void> specialization do
> >>>> not compile
> >>>>
> >>>> because std::allocator<void> is incomplete.
> >>> That doesn't look right ... it should be complete. This suggests there
> >>> is a deeper problem, which I'll look into.
> >> This is the correct fix:
> >>
> >> --- a/libstdc++-v3/include/bits/memoryfwd.h
> >> +++ b/libstdc++-v3/include/bits/memoryfwd.h
> >> @@ -63,8 +63,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> >> template<typename>
> >> class allocator;
> >>
> >> +#if ! _GLIBCXX_INLINE_VERSION
> >> template<>
> >> class allocator<void>;
> >> +#endif
> >>
> >> #if __cplusplus >= 201103L
> >> /// Declare uses_allocator so it can be specialized in `<queue>` etc.
> >
> > Actually, the allocator<void> specialization is still needed for
> > pre-C++20 with the versioned namespace, and that means there's the
> > same trivial default ctor ABI concern for the versioned namespace. I'm
> > testing a fix now, but it might not be committed until I'm back at
> > work on Tuesday.
> >
> Ok, there's no rush.
I've pushed the fix now.
>
> Note that I noticed that because I am working on PR 83077 to allow sso
> string in versioned namespace.
>
> My plan is to make the sso string the only std::string implementation in
> versioned namespace.
Great, thanks.
>
> Now that I saw your RFC about dropping C++98 support for versioned
> namespace I think my approach fall into this. But I also think that this
> RFC will be approved so it should be fine unless you have another concern.
>
> François
>
prev parent reply other threads:[~2021-08-28 13:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-27 20:57 François Dumont
2021-08-27 21:17 ` Jonathan Wakely
2021-08-28 9:26 ` Jonathan Wakely
2021-08-28 10:49 ` Jonathan Wakely
2021-08-28 12:40 ` François Dumont
2021-08-28 13:38 ` Jonathan Wakely [this message]
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