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CXX_MODULE_HEADER_UNIT_DIRS
---------------------------

.. versionadded:: 3.25

.. note ::

  Experimental. Gated by ``CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API``

Semicolon-separated list of base directories of the target's default C++
module header set (i.e. the file set with name and type
``CXX_MODULE_HEADER_UNITS``). 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_HEADER_UNIT_DIRS_<NAME>` for the list of base
directories in other C++ module header sets.