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+CMAKE_CURRENT_BINARY_DIR
+------------------------
+
+The path to the binary directory currently being processed.
+
+This the full path to the build directory that is currently being
+processed by cmake. Each directory added by :command:`add_subdirectory` will
+create a binary directory in the build tree, and as it is being
+processed this variable will be set. For in-source builds this is the
+current source directory being processed.
+
+When run in -P script mode, CMake sets the variables
+:variable:`CMAKE_BINARY_DIR`, :variable:`CMAKE_SOURCE_DIR`,
+:variable:`CMAKE_CURRENT_BINARY_DIR` and
+:variable:`CMAKE_CURRENT_SOURCE_DIR` to the current working directory.