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+add_definitions
+---------------
+
+Add -D define flags to the compilation of source files.
+
+.. code-block:: cmake
+
+  add_definitions(-DFOO -DBAR ...)
+
+Adds definitions to the compiler command line for targets in the current
+directory, whether added before or after this command is invoked, and for
+the ones in sub-directories added after. This command can be used to add any
+flags, but it is intended to add preprocessor definitions.
+
+.. note::
+
+  This command has been superseded by alternatives:
+
+  * Use :command:`add_compile_definitions` to add preprocessor definitions.
+  * Use :command:`include_directories` to add include directories.
+  * Use :command:`add_compile_options` to add other options.
+
+Flags beginning in ``-D`` or ``/D`` that look like preprocessor definitions are
+automatically added to the :prop_dir:`COMPILE_DEFINITIONS` directory
+property for the current directory.  Definitions with non-trivial values
+may be left in the set of flags instead of being converted for reasons of
+backwards compatibility.  See documentation of the
+:prop_dir:`directory <COMPILE_DEFINITIONS>`,
+:prop_tgt:`target <COMPILE_DEFINITIONS>`,
+:prop_sf:`source file <COMPILE_DEFINITIONS>` ``COMPILE_DEFINITIONS``
+properties for details on adding preprocessor definitions to specific
+scopes and configurations.
+
+See the :manual:`cmake-buildsystem(7)` manual for more on defining
+buildsystem properties.