Avoid overflow in WebRtcSpl_DotProductWithScale

webrtc/common_audio/BUILD.gn

Index: webrtc/common_audio/BUILD.gn
diff --git a/webrtc/common_audio/BUILD.gn b/webrtc/common_audio/BUILD.gn
index a3cf046bb46ddb4dcdb655e7e3d83ef6c305d522..52a6e2e05f5ef9e7062e97322923a453c651f3d2 100644
--- a/webrtc/common_audio/BUILD.gn
+++ b/webrtc/common_audio/BUILD.gn
@@ -113,7 +113,6 @@ rtc_source_set("common_audio_c") {
     "signal_processing/copy_set_operations.c",
     "signal_processing/cross_correlation.c",
     "signal_processing/division_operations.c",
-    "signal_processing/dot_product_with_scale.c",
     "signal_processing/downsample_fast.c",
     "signal_processing/energy.c",
     "signal_processing/filter_ar.c",
@@ -198,6 +197,24 @@ rtc_source_set("common_audio_c") {
     cflags = [ "/wd4334" ]  # Ignore warning on shift operator promotion.
   }
 
+  deps = [
+    ":common_audio_cc",
+  ]
+
+  public_configs = [ ":common_audio_config" ]
+}
+
+rtc_source_set("common_audio_cc") {
+  visibility = [ ":*" ]  # Only targets in this file can depend on this.
+  sources = [
+    "signal_processing/dot_product_with_scale.cc",
+    "signal_processing/dot_product_with_scale.h",
+  ]
+
+  if (is_win) {
+    cflags = [ "/wd4334" ]  # Ignore warning on shift operator promotion.

[kwiberg-webrtc, 2017/02/28 12:51:01]

This looks like an easy warning to just fix in this one tiny file:
https://msdn.microsoft.com/en-us/library/ke55d167.aspx

+  }
+
   public_configs = [ ":common_audio_config" ]
 }