zturner added a comment. I think it must be related to setting up the environment in which to run clang. In all other projects we call llvm_config.use_clang() which is in llvm/utils/lit/lit/llvm/config.py, but because here we have an exact path of a clang we are trying to use, we skip this function in LLDB's lit configuration files. But there is also a lot of other logic in that function, so perhaps it's some of that logic that's necessary.
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