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CXX_SCAN_FOR_MODULES
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--------------------
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.. versionadded:: 3.26
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``CXX_SCAN_FOR_MODULES`` is a boolean specifying whether CMake will scan the
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source for C++ module dependencies. See also the
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:prop_tgt:`CXX_SCAN_FOR_MODULES` for target-wide settings.
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When this property is set ``ON``, CMake will scan the source at build time and
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add module dependency information to the compile line as necessary. When this
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property is set ``OFF``, CMake will not scan the source at build time. When
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this property is unset, the :prop_tgt:`CXX_SCAN_FOR_MODULES` property is
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consulted.
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Note that scanning is only performed if C++20 or higher is enabled for the
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target and the source uses the ``CXX`` language. Scanning for modules in
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sources belonging to file sets of type ``CXX_MODULES`` is always performed.
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.. note ::
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This setting is meaningful only when experimental support for C++ modules
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has been enabled by the ``CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API`` gate.
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