egorzhdan added inline comments.

================
Comment at: clang/include/clang/Driver/ToolChain.h:219
+
+  static std::string concat(const std::string &Path, const Twine &A,
+                            const Twine &B = "", const Twine &C = "",
----------------
MaskRay wrote:
> This can use `llvm::sys::path::append`
The implementation of this already uses `llvm::sys::path::append`, do you mean 
replacing the usages of `concat` with `llvm::sys::path::append`?
That would produce quite a lot of boilerplate I think, since 
`llvm::sys::path::append` modifies the path in-place, so every call to `concat` 
would expand into 3 lines of code. Also it would be very easy to forget to pass 
`Style::posix` and cause incorrect behavior on Windows (something I've stumbled 
upon while making this patch).


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D126289/new/

https://reviews.llvm.org/D126289

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