https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78052
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:5e3a1ea3d89d62972e1f036b2ede37a80b880bdf commit r12-723-g5e3a1ea3d89d62972e1f036b2ede37a80b880bdf Author: Jonathan Wakely <jwak...@redhat.com> Date: Tue May 11 15:01:01 2021 +0100 libstdc++: Fix missing members in std::allocator<void> The changes in 75c6a925dab5b7af9ab47c10906cb0e140261cc2 were slightly incorrect, because the converting constructor should be noexcept, and the POCMA and is_always_equal traits should still be present in C++20. This fixes it, and slightly refactors the preprocessor conditions and order of members. Also add comments explaining things. The non-standard construct and destroy members added for PR 78052 can be private if allocator_traits<allocator<void>> is made a friend. libstdc++-v3/ChangeLog: * include/bits/allocator.h (allocator<void>) [C++20]: Add missing noexcept to constructor. Restore missing POCMA and is_always_equal_traits. [C++17]: Make construct and destroy members private and declare allocator_traits as a friend. * include/bits/memoryfwd.h (allocator_traits): Declare. * include/ext/malloc_allocator.h (malloc_allocator::allocate): Add nodiscard attribute. Add static assertion for LWG 3307. * include/ext/new_allocator.h (new_allocator::allocate): Add static assertion for LWG 3307. * testsuite/20_util/allocator/void.cc: Check that converting constructor is noexcept. Check for propagation traits and size_type and difference_type. Check that pointer and const_pointer are gone in C++20.
