From e91dab816ce5d135c3633154f0742eaf543e5855 Mon Sep 17 00:00:00 2001
From: Andrew Zonenberg <azonenberg@drawersteak.com>
Date: Mon, 25 Jan 2016 19:33:40 -0500
Subject: [PATCH] Pcbnew DRC: allow technical->copper pad overlap

This permits things like mask "pads" over copper pads for custom mask openings.
---
 pcbnew/drc.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pcbnew/drc.cpp b/pcbnew/drc.cpp
index 57eaeba786..ef61b5d90f 100644
--- a/pcbnew/drc.cpp
+++ b/pcbnew/drc.cpp
@@ -955,6 +955,13 @@ bool DRC::doPadToPadsDrc( D_PAD* aRefPad, D_PAD** aStart, D_PAD** aEnd, int x_li
             if( pad->PadNameEqual( aRefPad ) )
                 continue;
         }
+        
+        // if either pad has no drill and is only on technical layers, not a clearance violation
+        if( ( ( pad->GetLayerSet() & layerMask ) == 0 && !pad->GetDrillSize().x ) ||
+            ( ( aRefPad->GetLayerSet() & layerMask ) == 0 && !aRefPad->GetDrillSize().x ) )
+        {
+            continue;
+        }
 
         if( !checkClearancePadToPad( aRefPad, pad ) )
         {