pogo59 wrote:

> LLVM_ENABLE_PER_TARGET_RUNTIME_DIR=on 

I'm unable to find what code this affects. I don't see it mentioned anywhere in 
clang/lib or clang/include.

It does seem like it should control the behavior of `ToolChain::getCompilerRT`; 
where I had added the Windows/PS check, seems like it should check the config 
variable instead. It's obvious that OS-based checks are not appropriate, as 
@tru reports using the new scheme but MSVC clearly uses the old scheme, both on 
Windows.

How do CMake variables turn into something that controls code behavior?

https://github.com/llvm/llvm-project/pull/89775
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