haowei added a comment.

In D144603#4162223 <https://reviews.llvm.org/D144603#4162223>, @phosek wrote:

> I agree, in that case let's remove 
> `C_COMPILER_LAUNCHER;CXX_COMPILER_LAUNCHER` from the list of default 
> passthrough variables which seems like a reasonable default, and provide 
> `CLANG_BOOTSTRAP_EXTRA_PASSTHROUGH` so developers have a way to pass these 
> through to the next stage if they want to.

There is already a `CLANG_BOOTSTRAP_PASSTHROUGH` flag 
https://github.com/llvm/llvm-project/blob/dc1c8917afd3f2b306797890a56be66087feb832/clang/CMakeLists.txt#L749
 that works in the way you describe the `CLANG_BOOTSTRAP_EXTRA_PASSTHROUGH` 
flag.

I think remove the compiler launcher from default pass through flags are fine. 
What about the using compiler launcher in runtime builds? I don't think we 
should read `CLANG_BOOTSTRAP_PASSTHROUGH` to determine if we should pass 
through compiler launcher flags.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D144603/new/

https://reviews.llvm.org/D144603

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