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+list
+----
+
+List operations.
+
+::
+
+  list(LENGTH <list> <output variable>)
+  list(GET <list> <element index> [<element index> ...]
+       <output variable>)
+  list(APPEND <list> [<element> ...])
+  list(FIND <list> <value> <output variable>)
+  list(INSERT <list> <element_index> <element> [<element> ...])
+  list(REMOVE_ITEM <list> <value> [<value> ...])
+  list(REMOVE_AT <list> <index> [<index> ...])
+  list(REMOVE_DUPLICATES <list>)
+  list(REVERSE <list>)
+  list(SORT <list>)
+
+LENGTH will return a given list's length.
+
+GET will return list of elements specified by indices from the list.
+
+APPEND will append elements to the list.
+
+FIND will return the index of the element specified in the list or -1
+if it wasn't found.
+
+INSERT will insert elements to the list to the specified location.
+
+REMOVE_AT and REMOVE_ITEM will remove items from the list.  The
+difference is that REMOVE_ITEM will remove the given items, while
+REMOVE_AT will remove the items at the given indices.
+
+REMOVE_DUPLICATES will remove duplicated items in the list.
+
+REVERSE reverses the contents of the list in-place.
+
+SORT sorts the list in-place alphabetically.
+
+The list subcommands APPEND, INSERT, REMOVE_AT, REMOVE_ITEM,
+REMOVE_DUPLICATES, REVERSE and SORT may create new values for the list
+within the current CMake variable scope.  Similar to the SET command,
+the LIST command creates new variable values in the current scope,
+even if the list itself is actually defined in a parent scope.  To
+propagate the results of these operations upwards, use SET with
+PARENT_SCOPE, SET with CACHE INTERNAL, or some other means of value
+propagation.
+
+NOTES: A list in cmake is a ; separated group of strings.  To create a
+list the set command can be used.  For example, set(var a b c d e)
+creates a list with a;b;c;d;e, and set(var "a b c d e") creates a
+string or a list with one item in it.
+
+When specifying index values, if <element index> is 0 or greater, it
+is indexed from the beginning of the list, with 0 representing the
+first list element.  If <element index> is -1 or lesser, it is indexed
+from the end of the list, with -1 representing the last list element.
+Be careful when counting with negative indices: they do not start from
+0.  -0 is equivalent to 0, the first list element.