DRC equivalence with commercial PDK DRC checker

[spnadig]

Environment

proppy/conda

Expected Behavior

DRC check from klayout must be identical and complete like cadence DRC

Actual Behavior

In MPW18H1 we had issue where GF flagged DRC errors when they checked our design submission which WAS NOT picked up by open source drc checker in klayout. We need to fix it by having equivalence with Cadence Calibre deck

Steps to Reproduce the Problem

1. RUN large analog MACROS in- https://github.com/spnadig/GF180_GAFE_1 in both opensource DRC checker and Cadence and you will see Cadence DRC finds a lot of DRC errors which are not picked up by klayout

[mithro]

FYI - Cadence != Calibre?

[mithro]

FYI - @proppy

[proppy]

/cc @ctlew