EricWF added a comment.
In https://reviews.llvm.org/D32265#731709, @jfb wrote:
> Is it a goal to support Microsoft's STL with this? If so, how does MSVC's STL
> implement `is_always_lock_free` at the moment? CL 19 2017 RTW doesn't seem to
> have anything <https://godbolt.org/g/jQOxlu>? Presumably they'll have to do
The goal is to allow libc++ to implement`ATOMIC_<TYPE>_LOCK_FREE` on Windows
using Clang. As you know libc++ currently uses the `__GCC_ATOMIC_FOO` macros,
but those aren't available on Windows.
Also AFAIK MSVC leaves the implementation of atomics up to the library, not the
frontend. So W/E MSVC's STL does it's likely not sane or desirable.
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