xdcmake.exe options in the development environment (property pages) differ from the options when xdcmake.exe is used at the command line. For information on using xdcmake.exe at the command line, see XDCMake Reference.
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Additional Document Files
Additional directories in which you want the project system to look for .xdc files. xdcmake will always look for .xdc files generated by the project. Multiple directories can be specified.