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CMake only sets `CMAKE_CACHEFILE_DIR` when writing `CMakeCache.txt`, so the variable will usually be undefined when `CMakeLists.txt` runs. Revise its documentation to clarify that `CMAKE_BINARY_DIR` should be used instead.
cf4100d7
CMake only sets `CMAKE_CACHEFILE_DIR` when writing `CMakeCache.txt`, so the variable will usually be undefined when `CMakeLists.txt` runs. Revise its documentation to clarify that `CMAKE_BINARY_DIR` should be used instead.