[libcxx-commits] [libcxx] [libc++] Suppress reserved module name warning for `module std` (PR #228632)

[Sharadh Rajaraman via libcxx-commits]

sharadhr wrote:

Compiling the standard library module manually at the command-line emits this warning. It is quite obvious `std` is provided by the toolchain, and that warning shouldn't be emitted. This clutters up the output for users who enable stuff like `-Wall -Wextra`. For instance:

```
/usr/local/.../clang/host/linux-x86/clang-r614150/bin/clang++ -std=c++20 -stdlib=libc++ -fmodule-output=std.pcm -c /usr/local/.../clang/host/linux-x86/clang-r614150/share/libc++/v1/std.cppm -o std.o
/usr/local/.../clang-r614150/share/libc++/v1/std.cppm:167:15: warning: 'std' is a reserved name for a module
      [-Wreserved-module-identifier]
  167 | export module std;
      |               ^
1 warning generated.
```

https://github.com/llvm/llvm-project/pull/228632