On Fri, 27 Aug 2021 at 22:17, Jonathan Wakely <jwak...@redhat.com> wrote:
>
> On Fri, 27 Aug 2021 at 21:58, François Dumont via Libstdc++
> <libstd...@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.
>
>
> >
> > So I think primary _ExtPtr_allocator template should also be prefered in
> > _GLIBCXX_INLINE_VERSION mode.
>
> I think it should always be preferred. The _ExtPtr_allocator<void>
> specialization is useless, it is missing the converting constructor
> that would be needed to convert to/from that type to any other
> _ExtPtr_allocator<T> specialization.
