[Discuss-gnuradio] gr-trellis broken on next branch

[Achilleas Anastasopoulos]

After installing the next branch i realized that gr-trellis is not
working properly!

This is due to some work (by Ben Raynwar) that makes gr-trellis
dependent on gr-digital (???)
In particular the constants related to trellis_metric_type.h cannot be
accessed in python/grc
as part of the trellis module, but as part of the digital module
(this problem appears for instance if you run some of the pccc/sccc
examples in gnuradio-examples/grc/trellis).

This can be an easy fix (import digital in all the grc blocks
requiring metric types, and make appropriate changes).

However I wonder what is the point of making a self-contained
module like gr-trellis dependent on another module (gr-digital)
If the only reason is to to use the "constellation" object in the
"metrics" blocks then these blocks should
reside in the gr-digital module instead of the gr-trellis, so that the
latter can still be self-contained.

Ben, can you please explain what is your rational in doing these changes.

thanks,
Achilleas