4 The path to the top level of the build tree.
6 This is the full path to the top level of the current CMake build
7 tree. For an in-source build, this would be the same as
8 :variable:`CMAKE_SOURCE_DIR`.
10 When run in -P script mode, CMake sets the variables
11 :variable:`CMAKE_BINARY_DIR`, :variable:`CMAKE_SOURCE_DIR`,
12 :variable:`CMAKE_CURRENT_BINARY_DIR` and
13 :variable:`CMAKE_CURRENT_SOURCE_DIR` to the current working directory.