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

src/pdf/SkPDFUtils.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPDFUtils_DEFINED
 #define SkPDFUtils_DEFINED
 
 #include "SkPaint.h"
 #include "SkPath.h"
 
 class SkMatrix;
 class SkPath;
 class SkPDFArray;
 struct SkRect;
 class SkWStream;
 
 #if 0
 #define PRINT_NOT_IMPL(str) fprintf(stderr, str)
 #else
 #define PRINT_NOT_IMPL(str)
 #endif
 
 #define NOT_IMPLEMENTED(condition, assert)                         \
     do {                                                           \
-        if (condition) {                                           \
+        if ((bool)(condition)) {                                   \
             PRINT_NOT_IMPL("NOT_IMPLEMENTED: " #condition "\n");   \
             SkDEBUGCODE(SkASSERT(!assert);)                        \
         }                                                          \
     } while (0)
 
 class SkPDFUtils {
 public:
     static SkPDFArray* RectToArray(const SkRect& rect);
     static SkPDFArray* MatrixToArray(const SkMatrix& matrix);
     static void AppendTransform(const SkMatrix& matrix, SkWStream* content);
 
     static void MoveTo(SkScalar x, SkScalar y, SkWStream* content);
     static void AppendLine(SkScalar x, SkScalar y, SkWStream* content);
     static void AppendCubic(SkScalar ctl1X, SkScalar ctl1Y,
                             SkScalar ctl2X, SkScalar ctl2Y,
                             SkScalar dstX, SkScalar dstY, SkWStream* content);
     static void AppendRectangle(const SkRect& rect, SkWStream* content);
     static void EmitPath(const SkPath& path, SkPaint::Style paintStyle,
                          SkWStream* content);
     static void ClosePath(SkWStream* content);
     static void PaintPath(SkPaint::Style style, SkPath::FillType fill,
                           SkWStream* content);
     static void StrokePath(SkWStream* content);
     static void DrawFormXObject(int objectIndex, SkWStream* content);
     static void ApplyGraphicState(int objectIndex, SkWStream* content);
     static void ApplyPattern(int objectIndex, SkWStream* content);
 };
 
 #endif