Bug 1256482 - Disable C4312 to unblock compilation on VS2015; r?jesup As part of unblocking building with VS2015u1 in automation, I'm mass disabling compiler warnings that are turned into errors. This is not the preferred mechanism to fix compilation warnings, of course. Given that the warning is in WebRTC which is third party code, there isn't much we can do about the warning. However, Google is building Chrome with Visual Studio 2015, so I wouldn't be surprised if this were fixed upstream or will be fixed upstream. Then again, we allow warnings when building WebRTC. So perhaps not. MozReview-Commit-ID: G6JP9fkCzfn

--- a/dom/media/webrtc/moz.build
+++ b/dom/media/webrtc/moz.build
@@ -87,10 +87,12 @@ if CONFIG['GNU_CC'] or CONFIG['CLANG_CL'
         '-Wno-error=attributes'
     ]
 
 FINAL_LIBRARY = 'xul'
 
 if CONFIG['_MSC_VER']:
     CXXFLAGS += [
         '-wd4275', # non dll-interface class used as base for dll-interface class
+        '-wd4312', # This is intended as a temporary hack to support building with VS2015
+                   # 'reinterpret_cast': conversion from 'DWORD' to 'HANDLE' of greater size
     ]
     DEFINES['__PRETTY_FUNCTION__'] = '__FUNCSIG__'