Turn on -Wall -Wextra on Mac, and fix all the warnings that crop up for /usr/bin/g++ and Clang 3.3.

bench/PathIterBench.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 "SkBenchmark.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 54 matching lines @@
         return fName.c_str();
     }
 
     virtual void onDraw(SkCanvas*) SK_OVERRIDE {
         if (fRaw) {
             for (int i = 0; i < N; ++i) {
                 SkPath::RawIter iter(fPath);
                 SkPath::Verb verb;
                 SkPoint      pts[4];
 
-                while ((verb = iter.next(pts)) != SkPath::kDone_Verb);
+                while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { }
             }
         } else {
             for (int i = 0; i < N; ++i) {
                 SkPath::Iter iter(fPath, false);
                 SkPath::Verb verb;
                 SkPoint      pts[4];
 
-                while ((verb = iter.next(pts)) != SkPath::kDone_Verb);
+                while ((verb = iter.next(pts)) != SkPath::kDone_Verb) { }
             }
         }
     }
 
 private:
     typedef SkBenchmark INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static SkBenchmark* F0(void* p) { return new PathIterBench(p, false); }
 static SkBenchmark* F1(void* p) { return new PathIterBench(p, true); }
 
 static BenchRegistry gR0(F0);
 static BenchRegistry gR1(F1);