How to remove the bufgs that are not being used

Hi,
I have a IP block that has BUFGs that may or may not be used depending on which design the IP block is used. If they are not used I would like them to be removed but the tools are not consistent, sometimes they remove them and sometimes they do not.
How do I specifically tell Vivado to remove a BUFG in the .XDC file?
I've seen someone suggest to use the following attribute in the VHDL file but I need something in the XDC file
attribute buffer_type of drck_i : signal is "none";
Thank you,
Luis

Hi 
If the BUFG instance is instantiated in the IP or your design then the buffer_type attribute will not work.
The opt_design trims the unconnected instances during implementation. Ensure that the BUFG does not have  DONT_TOUCH property set on it which might affect trimming.
Thanks,
Deepika.

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