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Verilog Matlab VHDL Other
branch: master

Auto-include `<model_name>/ucf/*.ucf` constraints

Constraints files (i.e. any file with a `.ucf` extension) in the
`<model_name>/ucf` directory will be automatically included in the
constraints file generated by `gen_xps_mod_ucf`.  This directory
location can be overridden by setting the `USER_UCF_PATH` environment
variable to a directory containing constraints files.

If `USER_UCF_PATH` is set, the specified directory must exist and
contain at least one UCF file, otherwise an error is raised.

If `USER_UCF_PATH` is not set, no error will be raised for a
non-existent or empty `<model_name>/ucf` directory.

These behaviors provide backwards compatibility and are arguably sensible
anyway.
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