Mark de Wever b9f24033f7 [libc++][C++20 modules] Enabling in C++20.
The vendors of the MSVC STL, libstdc++ and libc++ have agreed [1] to
make the C++23 modules std and std.compat available in C++20. This
provides the std module; libc++ has not implemented the std.compat
module yet.

[1] https://github.com/microsoft/STL/issues/3945

Depends on D158357

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D158358
2023-09-05 18:10:46 +02:00
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