Source release v3.0.2

third_party/protobuf.gypi

@@ -31,6 +31,20 @@
       '<(protobuf_source)/src/google/protobuf/stubs/stringprintf.cc',
     ],
   },
+  'target_defaults': {
+    # These flags silence warnings that appear in protobuf upstream.
+    # We will not maintain a divergent copy of protobuf to fix them.
+    'cflags': [
+      # Ignore unknown warning options, to support both gcc & clang at once.
+      '-Wno-unknown-warning-option',
+      # GCC:
+      '-Wno-sign-compare',
+      '-Wno-unused-local-typedefs',
+      # Clang:
+      '-Wno-unused-const-variable',
+      '-Wno-unused-function',
+    ],
+  },
   'targets': [
     {
       'target_name': 'protobuf_lite',