Re: [PATCH v2] libstdc++: Workaround for LLVM-61763 in ranges

[Jonathan Wakely <jwakely@redhat.com>]

On Sat, 21 Oct 2023 at 12:16, Jonathan Wakely <jwakely@redhat.com> wrote:
>
> On Mon, 16 Oct 2023 at 04:56, Benjamin Acker Brock <brock@berkeley.edu> wrote:
> >
> > > I don't think this patch counts as legally significant, but if you contribute again in future you should be aware of https://gcc.gnu.org/contribute.html#legal and either complete the copyright assignment paperwork, or add a DCO sign-off to the commit message.
> >
> > Thanks for the reminder. I just added a sign-off.
>
> Thanks.
>
> > > This should be a complete sentence, so capital letter and full stop.
> >
> > Fixed!
>
> I actually adjusted the ChangeLog further, to name the modified components:
>
>            * include/std/ranges (zip_view, adjacent_view): Implement
>            workaround for LLVM-61763.
>
> This is the usual convention.
>
> Pushed to trunk now, thanks again for the fix!

I'll backport this to the gcc-13 branch too.


>
>
> > ---
> >
> > Signed-off-by: Benjamin Brock <brock@cs.berkeley.edu>
> >
> >     libstdc++-v3/ChangeLog:
> >
> >             * include/std/ranges: Implement workaround for LLVM-61763 in
> >               zip_view and adjacency_view.
> >
> > ---
> >
> > diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
> > index 1d529a886be..7893e3a84c9 100644
> > --- a/libstdc++-v3/include/std/ranges
> > +++ b/libstdc++-v3/include/std/ranges
> > @@ -4632,6 +4632,9 @@ namespace views::__adaptor
> >    class zip_view<_Vs...>::_Iterator
> >      : public __detail::__zip_view_iter_cat<_Const, _Vs...>
> >    {
> > +#ifdef __clang__ // LLVM-61763 workaround
> > +  public:
> > +#endif
> >      __detail::__tuple_or_pair_t<iterator_t<__detail::__maybe_const_t<_Const,
> > _Vs>>...> _M_current;
> >
> >      constexpr explicit
> > @@ -4652,11 +4655,13 @@ namespace views::__adaptor
> >         return input_iterator_tag{};
> >      }
> >
> > +#ifndef __clang__ // LLVM-61763 workaround
> >      template<move_constructible _Fp, input_range... _Ws>
> >        requires (view<_Ws> && ...) && (sizeof...(_Ws) > 0) && is_object_v<_Fp>
> >         && regular_invocable<_Fp&, range_reference_t<_Ws>...>
> >         && std::__detail::__can_reference<invoke_result_t<_Fp&,
> > range_reference_t<_Ws>...>>
> >        friend class zip_transform_view;
> > +#endif
> >
> >    public:
> >      // iterator_category defined in __zip_view_iter_cat
> > @@ -5327,6 +5332,9 @@ namespace views::__adaptor
> >    template<bool _Const>
> >    class adjacent_view<_Vp, _Nm>::_Iterator
> >    {
> > +#ifdef __clang__ // LLVM-61763 workaround
> > +  public:
> > +#endif
> >      using _Base = __detail::__maybe_const_t<_Const, _Vp>;
> >      array<iterator_t<_Base>, _Nm> _M_current = array<iterator_t<_Base>, _Nm>();
> >
> > @@ -5367,12 +5375,14 @@ namespace views::__adaptor
> >
> >      friend class adjacent_view;
> >
> > +#ifndef __clang__ // LLVM-61763 workaround
> >      template<forward_range _Wp, move_constructible _Fp, size_t _Mm>
> >        requires view<_Wp> && (_Mm > 0) && is_object_v<_Fp>
> >          && regular_invocable<__detail::__unarize<_Fp&, _Mm>,
> > range_reference_t<_Wp>>
> >          && std::__detail::__can_reference<invoke_result_t<__detail::__unarize<_Fp&,
> > _Mm>,
> >
> > range_reference_t<_Wp>>>
> >        friend class adjacent_transform_view;
> > +#endif
> >
> >    public:
> >      using iterator_category = input_iterator_tag;
> >