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CXX_SCAN_FOR_MODULES
--------------------
.. versionadded:: 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
:prop_sf:`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
:variable:`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.
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