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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This command has been superseded by alternatives: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 Also
^^^^^^^^
* The :manual:`cmake-buildsystem(7)` manual for more on defining
buildsystem properties.
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