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This command has been superseded by alternatives:
add_compile_definitions() to add preprocessor definitions.include_directories() to add include directories.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 the cmake-buildsystem(7) manual for more on defining buildsystem properties.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/command/add_definitions.html