Make 'webrtc' a static library.

webrtc/BUILD.gn

 # Copyright (c) 2014 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.
 
 # TODO(kjellander): Rebase this to webrtc/build/common.gypi changes after r6330.
 
@@ skipping 222 matching lines @@
   }
 }
 
 config("common_objc") {
   libs = [ "Foundation.framework" ]
   precompiled_header = "sdk/objc/WebRTC-Prefix.pch"
   precompiled_source = "sdk/objc/WebRTC-Prefix.pch"
 }
 
 if (!is_ios || !build_with_chromium) {
-  rtc_source_set("webrtc") {
+  rtc_static_library("webrtc") {
     sources = [
+      # TODO(kjellander): Remove this whenever possible. GN's static_library
+      # target type requires at least one object to avoid errors linking.
+      "build/no_op_function.cc",
       "call.h",
       "config.h",
       "transport.h",
     ]
 
     defines = []
 
     deps = [
       ":webrtc_common",
       "audio",
@@ skipping 587 matching lines @@
       ]
 
       deps = [
         "//webrtc/api:libjingle_peerconnection_java",
         "//webrtc/api:libjingle_peerconnection_jni",
         "//webrtc/examples:AppRTCDemo_javalib",
       ]
     }
   }
 }