[Bug libstdc++/70940] New: pmr::resource_adaptor requires optional allocator requirements and incorrectly aligns returned pointers.

[eric at efcs dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70940

            Bug ID: 70940
           Summary: pmr::resource_adaptor requires optional allocator
                    requirements and incorrectly aligns returned pointers.
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: eric at efcs dot ca
  Target Milestone: ---

resource_adapter incorrectly requires that the Allocator provide:
  * A pointer typedef.
  * A default constructor.

Furthermore it seems that do_allocate returns ill-aligned pointers. It seems
that do_allocate(s, a) returns the pointers from
'Allocator<char>.allocate(...)' directly even though they have no alignment
guarantees.