[Bug libstdc++/88840] [9 Regression] std::allocator::construct signature might be ill-formed now

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88840

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu Jan 24 15:39:25 2019
New Revision: 268239

URL: https://gcc.gnu.org/viewcvs?rev=268239&root=gcc&view=rev
Log:
PR libstdc++/88840 delay evaluation of constant until type is complete

Clang fails to compile std::vector<Incomplete> because the static member
__use_relocate cannot be evaluated for an incomplete type. Replace with
a static member function that will not be odr-used until needed, by
which point the type must be complete.

        PR libstdc++/88840
        * include/bits/stl_vector.h (vector::__use_relocate): Replace static
        data member with static member function _S_use_relocate().
        * include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
        (vector::_M_default_append): Use _S_use_relocate() instead of
        __use_relocate.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/stl_vector.h
    trunk/libstdc++-v3/include/bits/vector.tcc