[Bug libstdc++/66559] New: Uses-allocator construction disregarded by list::emplace_back

[Bug libstdc++/66559] New: Uses-allocator construction disregarded by list::emplace_back

[potswa at mac dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66559

            Bug ID: 66559
           Summary: Uses-allocator construction disregarded by
                    list::emplace_back
           Product: gcc
           Version: 5.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: potswa at mac dot com
  Target Milestone: ---

Created attachment 35790
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35790&action=edit
Test case

A std::set with a scoped_allocator_adapter emplaces nodes with uses-allocator
construction, but a std::list does not.

[Bug libstdc++/66559] Uses-allocator construction disregarded by list::emplace_back

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66559

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
That's only the tip of the iceberg, std::list's allocator support is incomplete

*** This bug has been marked as a duplicate of bug 55409 ***

[Bug libstdc++/66559] Uses-allocator construction disregarded by list::emplace_back

[potswa at mac dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66559

--- Comment #2 from David Krauss <potswa at mac dot com> ---
That bug only mentions missing allocator_traits support.

It looks like the problem here is that _List_node declares a member _Tp and
initializes it, whereas it should declare aligned storage for a _Tp and let the
container initialize it.

[Bug libstdc++/66559] Uses-allocator construction disregarded by list::emplace_back

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66559

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, I know what the bug is. If the container used
allocator_traits::construct() as it's supposed to then scoped_allocator_adaptor
would work. 

The problem is that std::list is missing all C++11 allocator support. There's
no point having separate bugs for every little piece. This is a duplicate.