[Bug 255720] std::memory_order::memory_order_seq_cst doesn't exist in c++2a when the standard says that it should exist

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255720

            Bug ID: 255720
           Summary: std::memory_order::memory_order_seq_cst doesn't exist
                    in c++2a when the standard says that it should exist
           Product: Base System
           Version: 12.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: standards
          Assignee: standards at FreeBSD.org
          Reporter: yuri at freebsd.org

This code:

> #include <atomic>
> 
> void f() {
>         std::atomic<unsigned int> n;
>         n.fetch_add(std::memory_order::memory_order_seq_cst);
> }

fails with -std=c++2a:
> x.cpp:10:33: error: no member named 'memory_order_seq_cst' in 'std::__1::memory_order'
>         n.fetch_add(std::memory_order::memory_order_seq_cst);
>                     ~~~~~~~~~~~~~~~~~~~^

but succeeds with -std=c++17.

The standard doesn't say that this symbol is obsoleted in c++20:
https://en.cppreference.com/w/cpp/atomic/memory_order

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