std::allocator should use sized delete

[Jonathan Wakely]

On 07/06/19 10:56 +0300, Victor via libstdc++ wrote:
>On Fri, 7 Jun 2019 09:49:13 +0200 (CEST)
> Marc Glisse <marc.glisse@inria.fr> wrote:
>>On Fri, 7 Jun 2019, Victor via libstdc++ wrote:
>>
>>
>>Please check the repository
>>
>>https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libstdc%2B%2B-v3/include/ext/new_allocator.h;h=ee699532c6a2bc32bef827a9ecccbea15edfe579;hb=HEAD#l123
>>
>>-- 
>>Marc Glisse
>
>There is no actual release with this change at the moment.
>
>https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libstdc%2B%2B-v3/include/ext/new_allocator.h;h=e24539100f9e9885cf0d590a8801740c9fa521f6;hb=refs/heads/gcc-9-branch
>
>Any plans to backport this to gcc-9-branch?

No, because if you don't use the very latest version of tcmalloc
(released only two months ago) then sized delete can crash the
process.

See https://gcc.gnu.org/ml/libstdc++/2019-05/msg00172.html and the
earlier mails on this list such as
https://gcc.gnu.org/ml/libstdc++/2019-04/msg00012.html and
https://gcc.gnu.org/ml/libstdc++/2019-03/msg00020.html