add_definitions

Add -D define flags to the compilation of source files.

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This command has been superseded by alternatives: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 add_compile_definitions() to add preprocessor definitions.

• Use include_directories() to add include directories.

• Use add_compile_options() to add other options.

Flags beginning in -D or /D that look like preprocessor definitions are automatically added to the 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 directory, target, source file COMPILE_DEFINITIONS properties for details on adding preprocessor definitions to specific scopes and configurations.

See Also

• The cmake-buildsystem(7) manual for more on defining buildsystem properties.