CXX_SCAN_FOR_MODULES

New in version 3.28.

CXX_SCAN_FOR_MODULES is a boolean specifying whether CMake will scan C++ sources in the target for module dependencies. See also the CXX_SCAN_FOR_MODULES for per-source settings which, if set, overrides the target-wide settings.

This property is initialized by the value of the CMAKE_CXX_SCAN_FOR_MODULES variable if it is set when a target is created.

When this property is set ON or unset, CMake will scan the target's CXX sources 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 target's CXX sources at build time.

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