CMake expects a cmake file with that name for setup.
Where does CMake expect the file to be? I provided an appropriate file in the source directory on of the many tests I made. But CMake didn’t search `${PROJECT_SOURCE_DIR}/Compiler/cc65-ASM.cmake’.
CC65 is not supported by CMake itself.
Yes, this is indeed the problem. Using an unsupported compiler with CMake seem to be close to impossible.