CXX_SCAN_FOR_MODULES

.. versionadded:: 3.28

CXX_SCAN_FOR_MODULES is a boolean specifying whether CMake will scan the source for C++ module dependencies. See also the :prop_tgt:CXX_SCAN_FOR_MODULES for target-wide settings.

When this property is set ON, CMake will scan the source at build time and add module dependency information to the compile line as necessary. When this property is set OFF, CMake will not scan the source at build time. When this property is unset, the :prop_tgt:CXX_SCAN_FOR_MODULES property is consulted.

Note that scanning is only performed if C++20 or higher is enabled for the target and the source uses the CXX language. Scanning for modules in sources belonging to file sets of type CXX_MODULES is always performed.