My clang now doesn't complain about !"foo".

experimental/StrokePathRenderer/GrStrokePathRenderer.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrStrokePathRenderer.h"
 
 #include "GrDrawTarget.h"
@@ skipping 248 matching lines @@
                     *idxs++  = vCount+2;
                     *idxs++  = vCount+3;
 
                     vCount += 4;
                     iCount += 6;
                 }
             }
                 break;
             case SkPath::kQuad_Verb:
             case SkPath::kCubic_Verb:
-                SkASSERT(!"Curves not supported!");
+                SkDEBUGFAIL("Curves not supported!");
             default:
                 // Unhandled cases
                 SkASSERT(false);
         }
     }
 
     if (isOpen) {
         // Add caps
         switch (stroke.getCap()) {
             case SkPaint::kSquare_Cap:
                 firstPt[0] -= firstDir;
                 firstPt[1] -= firstDir;
                 lastPt [0] += dir;
                 lastPt [1] += dir;
                 break;
             case SkPaint::kRound_Cap:
-                SkASSERT(!"Round caps not supported!");
+                SkDEBUGFAIL("Round caps not supported!");
             default: // No cap
                 break;
         }
     }
 
     SkASSERT(vCount <= maxVertexCount);
     SkASSERT(iCount <= maxIndexCount);
 
     if (vCount > 0) {
         target->drawIndexed(kTriangles_GrPrimitiveType,
                             0,        // start vertex
                             0,        // start index
                             vCount,
                             iCount);
     }
 
     return true;
 }