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cmake/Help/command/output_required_files.rst

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output_required_files
---------------------
Disallowed since version 3.0. See CMake Policy :policy:`CMP0032`.
Approximate C preprocessor dependency scanning.
This command exists only because ancient CMake versions provided it.
CMake handles preprocessor dependency scanning automatically using a
more advanced scanner.
.. code-block:: cmake
output_required_files(srcfile outputfile)
Outputs a list of all the source files that are required by the
specified ``srcfile``. This list is written into ``outputfile``. This is
similar to writing out the dependencies for ``srcfile`` except that it
jumps from ``.h`` files into ``.cxx``, ``.c`` and ``.cpp`` files if possible.