boomanaiden154 wrote:

> What I see is that you're reusing the same initial CMake config for 
> everything, even though in order to test Clang against libc++ and its tests, 
> we need to reconfigure CMake to use just-built Clang, by supplying -D 
> CMAKE_C_COMPILER="${INSTALL_DIR}/bin/clang" and -D 
> CMAKE_CXX_COMPILER="${INSTALL_DIR}/bin/clang++". Otherwise we're simply 
> losing this additional coverage for Clang.

We're using `LLVM_ENABLE_RUNTIMES`. It uses the just built clang to build the 
runtimes specified. We're just doing this in a single CMake invocation (which 
will spawn sub-CMake invocations) rather than in multiple CMake invocations.

https://github.com/llvm/llvm-project/pull/142694
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