[libcxx-commits] [libcxx] [libcxx][clang-modules] Fix headers being marked as textual (PR #130723)

[Louis Dionne via libcxx-commits]

ldionne wrote:

> 
> Doesn't the build directory get used for running tests, at least locally?

Not anymore.

> Is there a particular reason we don't just re-generate `__config_site` when you switch targets?

I'm not certain I understand. But the idea is that on some platforms, we ship a single libc++ with multiple `__config_site` headers. The compiler then selects which `__config_site` to use based on the target selected by the user. This allows a single toolchain to support multiple targets, and for these multiple targets to have differently-configured libc++s. Since the user is free to select the target they are compiling for on the fly, it wouldn't make sense to require a "rebuild" of libc++ for that to work.

https://github.com/llvm/llvm-project/pull/130723