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

src/gpu/gl/GrGLUtil.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 "GrGLUtil.h"
 
@@ skipping 75 matching lines @@
 #endif
 
 #if GR_GL_CHECK_ERROR
     bool gCheckErrorGL = !!(GR_GL_CHECK_ERROR_START);
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GrGLBinding GrGLGetBindingInUseFromString(const char* versionString) {
     if (NULL == versionString) {
-        SkASSERT(!"NULL GL version string.");
+        SkDEBUGFAIL("NULL GL version string.");
         return kNone_GrGLBinding;
     }
 
     int major, minor;
 
     // check for desktop
     int n = sscanf(versionString, "%d.%d", &major, &minor);
     if (2 == n) {
         return kDesktop_GrGLBinding;
     }
@@ skipping 15 matching lines @@
 }
 
 bool GrGLIsMesaFromVersionString(const char* versionString) {
     int major, minor, mesaMajor, mesaMinor;
     int n = sscanf(versionString, "%d.%d Mesa %d.%d", &major, &minor, &mesaMajor, &mesaMinor);
     return 4 == n;
 }
 
 GrGLVersion GrGLGetVersionFromString(const char* versionString) {
     if (NULL == versionString) {
-        SkASSERT(!"NULL GL version string.");
+        SkDEBUGFAIL("NULL GL version string.");
         return 0;
     }
 
     int major, minor;
 
     // check for mesa
     int mesaMajor, mesaMinor;
     int n = sscanf(versionString, "%d.%d Mesa %d.%d", &major, &minor, &mesaMajor, &mesaMinor);
     if (4 == n) {
         if (get_gl_version_for_mesa(mesaMajor, &major, &minor)) {
@@ skipping 18 matching lines @@
     n = sscanf(versionString, "OpenGL ES %d.%d", &major, &minor);
     if (2 == n) {
         return GR_GL_VER(major, minor);
     }
 
     return 0;
 }
 
 GrGLSLVersion GrGLGetGLSLVersionFromString(const char* versionString) {
     if (NULL == versionString) {
-        SkASSERT(!"NULL GLSL version string.");
+        SkDEBUGFAIL("NULL GLSL version string.");
         return 0;
     }
 
     int major, minor;
 
     int n = sscanf(versionString, "%d.%d", &major, &minor);
     if (2 == n) {
         return GR_GLSL_VER(major, minor);
     }
 
@@ skipping 47 matching lines @@
     const GrGLubyte* v;
     GR_GL_CALL_RET(gl, v, GetString(GR_GL_SHADING_LANGUAGE_VERSION));
     return GrGLGetGLSLVersionFromString((const char*) v);
 }
 
 GrGLVendor GrGLGetVendor(const GrGLInterface* gl) {
     const GrGLubyte* v;
     GR_GL_CALL_RET(gl, v, GetString(GR_GL_VENDOR));
     return GrGLGetVendorFromString((const char*) v);
 }