Expected: Use FetchContent_Delcare to declare the dependency and then use FetchContent_MakeAvailable and the built library and headers will be in the _deps/gpucpp-{build/subbuild/src}

Actual: The generating process ends up with an error. Error message and minimal reproducible CMakeLists.txt is inside the gist

The dawn library file doesn't appear in the third_party/lib directory. After I built this and put the libdawn.dylib into the third_party/lib directory the cmake command works.