clang/win: Build chromium code without -Wno-incompatible-pointer-types.

third_party/libwebp/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/arm.gni")
 
 config("libwebp_config") {
   include_dirs = [ "." ]
 }
 
@@ skipping 28 matching lines @@
   }
 }
 
 source_set("libwebp_demux") {
   sources = [
     "demux/demux.c",
   ]
   all_dependent_configs = [ ":libwebp_config" ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
+  deps = [
+    ":libwebp_utils",
+  ]
 }
 
 source_set("libwebp_dsp") {
   sources = [
     "dsp/alpha_processing.c",
     "dsp/alpha_processing_sse2.c",
     "dsp/cpu.c",
     "dsp/dec.c",
     "dsp/dec_clip_tables.c",
     "dsp/dec_mips32.c",
     "dsp/dec_sse2.c",
     "dsp/enc.c",
     "dsp/enc_avx2.c",
     "dsp/enc_mips32.c",
     "dsp/enc_sse2.c",
     "dsp/lossless.c",
     "dsp/lossless_mips32.c",
     "dsp/lossless_sse2.c",
     "dsp/upsampling.c",
     "dsp/upsampling_sse2.c",
     "dsp/yuv.c",
     "dsp/yuv_mips32.c",
     "dsp/yuv_sse2.c",
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
 
   all_dependent_configs = [ ":libwebp_config" ]
-  deps = []
+  deps = [
+    ":libwebp_utils",
+  ]
   if (is_android) {
     deps += [ "//third_party/android_tools:cpu_features" ]
   }
 
   # TODO(GYP):
   #      'conditions': [
   #        ['order_profiling != 0', {
   #          'target_conditions' : [
   #            ['_toolset=="target"', {
   #              'cflags!': [ '-finstrument-functions' ],
@@ skipping 56 matching lines @@
     "enc/syntax.c",
     "enc/token.c",
     "enc/tree.c",
     "enc/vp8l.c",
     "enc/webpenc.c",
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
 
   all_dependent_configs = [ ":libwebp_config" ]
+
+  deps = [
+    ":libwebp_utils",
+  ]
 }
 
 source_set("libwebp_utils") {
   sources = [
     "utils/bit_reader.c",
     "utils/bit_writer.c",
     "utils/color_cache.c",
     "utils/filters.c",
     "utils/huffman.c",
     "utils/huffman_encode.c",
     "utils/quant_levels.c",
     "utils/quant_levels_dec.c",
     "utils/random.c",
     "utils/rescaler.c",
     "utils/thread.c",
     "utils/utils.c",
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
 
   all_dependent_configs = [ ":libwebp_config" ]
+
+  config("libwebp_utils_warnings") {
+    if (is_clang) {
+      # See https://code.google.com/p/webp/issues/detail?id=253.
+      cflags = [ "-Wno-incompatible-pointer-types" ]
+    }
+  }
+  public_configs = [ ":libwebp_utils_warnings" ]
 }
 
 group("libwebp") {
   deps = [
     ":libwebp_dec",
     ":libwebp_demux",
     ":libwebp_dsp",
     ":libwebp_enc",
     ":libwebp_utils",
   ]
   public_configs = [ ":libwebp_config" ]
   if (use_dsp_neon) {
     deps += [ ":libwebp_dsp_neon" ]
   }
 }