Use latest LLVM and cache libc++ build.

stripe2933 / CppStandardLibraryModule

CMake project template for using C++ Standard Library Module.

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Closed stripe2933 closed 4 months ago

stripe2933 commented 4 months ago

This PR changes:

Now Clang CI use latest Clang compiler from homebrew.
Now Clang CI caches Libc++ build directory and use it if available. It solves long and inefficient clone-build time. Note that the cache is deleted after 7 days from its last usage, therefore weekly CI would not use this cache.