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

src/gpu/gl/GrGpuGL_program.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGpuGL.h"
 
 #include "GrEffect.h"
@@ skipping 273 matching lines @@
                                this,
                                dstCopy,
                                &colorStages,
                                &coverageStages,
                                &desc);
 
         fCurrentProgram.reset(fProgramCache->getProgram(desc,
                                                         colorStages.begin(),
                                                         coverageStages.begin()));
         if (NULL == fCurrentProgram.get()) {
-            SkASSERT(!"Failed to create program!");
+            SkDEBUGFAIL("Failed to create program!");
             return false;
         }
         fCurrentProgram.get()->ref();
 
         GrGLuint programID = fCurrentProgram->programID();
         if (fHWProgramID != programID) {
             GL_CALL(UseProgram(programID));
             fHWProgramID = programID;
         }
 
@@ skipping 93 matching lines @@
                          GrGLAttribTypeToLayout(attribType).fCount,
                          GrGLAttribTypeToLayout(attribType).fType,
                          GrGLAttribTypeToLayout(attribType).fNormalized,
                          stride,
                          reinterpret_cast<GrGLvoid*>(
                          vertexOffsetInBytes + vertexAttrib->fOffset));
     }
 
     attribState->disableUnusedAttribArrays(this, usedAttribArraysMask);
 }