Disable -Wsentinel warning for Linux 32-bit builds.

webrtc/examples/BUILD.gn

 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../build/webrtc.gni")
 if (is_android) {
@@ skipping 384 matching lines @@
         # Disable warnings failing when compiling with Clang on Windows.
         # https://bugs.chromium.org/p/webrtc/issues/detail?id=5366
         "-Wno-format",
 
         # See https://bugs.chromium.org/p/webrtc/issues/detail?id=6271
         # for -Wno-reorder and -Wno-sign-compare
         "-Wno-reorder",
         "-Wno-sign-compare",
       ]
     }
+    if (is_linux && target_cpu == "x86") {
+      cflags = [
+        # Needed to compile on Linux 32-bit.
+        "-Wno-sentinel",
+      ]
+    }
   }
 
   rtc_executable("peerconnection_client") {
     sources = [
       "peerconnection/client/conductor.cc",
       "peerconnection/client/conductor.h",
       "peerconnection/client/defaults.cc",
       "peerconnection/client/defaults.h",
       "peerconnection/client/peer_connection_client.cc",
       "peerconnection/client/peer_connection_client.h",
@@ skipping 31 matching lines @@
       "//third_party/libyuv",
       "//webrtc/api:libjingle_peerconnection",
       "//webrtc/system_wrappers:field_trial_default",
       "//webrtc/system_wrappers:metrics_default",
     ]
     configs += [ ":peerconnection_client_warnings_config" ]
     if (rtc_build_json) {
       deps += [ "//third_party/jsoncpp" ]
     }
   }
+
   rtc_executable("peerconnection_server") {
     sources = [
       "peerconnection/server/data_socket.cc",
       "peerconnection/server/data_socket.h",
       "peerconnection/server/main.cc",
       "peerconnection/server/peer_channel.cc",
       "peerconnection/server/peer_channel.h",
       "peerconnection/server/utils.cc",
       "peerconnection/server/utils.h",
     ]
@@ skipping 50 matching lines @@
       "//webrtc/system_wrappers:field_trial_default",
       "//webrtc/system_wrappers:metrics_default",
     ]
     if (is_clang) {
       # Suppress warnings from the Chromium Clang plugin.
       # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 }