Silence -Wclobbered in each file that needs it.

src/codec/SkJpegCodec.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCodec.h"
 #include "SkMSAN.h"
 #include "SkJpegCodec.h"
 #include "SkJpegDecoderMgr.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
 #include "SkStream.h"
 #include "SkTemplates.h"
 #include "SkTypes.h"
 
 // stdio is needed for libjpeg-turbo
 #include <stdio.h>
 #include "SkJpegUtility.h"
 
+// This warning triggers false postives way too often in here.
+#if defined(__GNUC__) && !defined(__clang__)
+    #pragma GCC diagnostic ignored "-Wclobbered"
+#endif
+
 extern "C" {
     #include "jerror.h"
     #include "jpeglib.h"
 }
 
 bool SkJpegCodec::IsJpeg(const void* buffer, size_t bytesRead) {
     static const uint8_t jpegSig[] = { 0xFF, 0xD8, 0xFF };
     return bytesRead >= 3 && !memcmp(buffer, jpegSig, sizeof(jpegSig));
 }
 
@@ skipping 867 matching lines @@
 
         JDIMENSION linesRead = jpeg_read_raw_data(dinfo, yuv, numRowsPerBlock);
         if (linesRead < remainingRows) {
             // FIXME: Handle incomplete YUV decodes without signalling an error.
             return kInvalidInput;
         }
     }
 
     return kSuccess;
 }