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+CXX_MODULE_DIRS
+---------------
+
+.. note ::
+
+ Experimental. Gated by ``CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API``
+
+Semicolon-separated list of base directories of the target's default
+C++ module set (i.e. the file set with name and type ``CXX_MODULES``). The
+property supports
+:manual:`generator expressions <cmake-generator-expressions(7)>`.
+
+This property is normally only set by :command:`target_sources(FILE_SET)`
+rather than being manipulated directly.
+
+See :prop_tgt:`CXX_MODULE_DIRS_<NAME>` for the list of base directories in
+other C++ module sets.