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+get_filename_component
+----------------------
+
+Get a specific component of a full filename.
+
+------------------------------------------------------------------------------
+
+::
+
+  get_filename_component(<VAR> <FileName> <COMP> [CACHE])
+
+Set ``<VAR>`` to a component of ``<FileName>``, where ``<COMP>`` is one of:
+
+::
+
+ DIRECTORY = Directory without file name
+ NAME      = File name without directory
+ EXT       = File name longest extension (.b.c from d/a.b.c)
+ NAME_WE   = File name without directory or longest extension
+ PATH      = Legacy alias for DIRECTORY (use for CMake <= 2.8.11)
+
+Paths are returned with forward slashes and have no trailing slashes.
+The longest file extension is always considered.  If the optional
+``CACHE`` argument is specified, the result variable is added to the
+cache.
+
+------------------------------------------------------------------------------
+
+::
+
+  get_filename_component(<VAR> <FileName>
+                         <COMP> [BASE_DIR <BASE_DIR>]
+                         [CACHE])
+
+Set ``<VAR>`` to the absolute path of ``<FileName>``, where ``<COMP>`` is one
+of:
+
+::
+
+ ABSOLUTE  = Full path to file
+ REALPATH  = Full path to existing file with symlinks resolved
+
+If the provided ``<FileName>`` is a relative path, it is evaluated relative
+to the given base directory ``<BASE_DIR>``.  If no base directory is
+provided, the default base directory will be
+:variable:`CMAKE_CURRENT_SOURCE_DIR`.
+
+Paths are returned with forward slashes and have no trailing slahes.  If the
+optional ``CACHE`` argument is specified, the result variable is added to the
+cache.
+
+------------------------------------------------------------------------------
+
+::
+
+  get_filename_component(<VAR> <FileName>
+                         PROGRAM [PROGRAM_ARGS <ARG_VAR>]
+                         [CACHE])
+
+The program in ``<FileName>`` will be found in the system search path or
+left as a full path.  If ``PROGRAM_ARGS`` is present with ``PROGRAM``, then
+any command-line arguments present in the ``<FileName>`` string are split
+from the program name and stored in ``<ARG_VAR>``.  This is used to
+separate a program name from its arguments in a command line string.