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.