Tweaks for new Objective-C API.

webrtc/api/api.gyp

 # Copyright (c) 2015 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.
 
 {
   'includes': [ '../build/common.gypi', ],
@@ skipping 176 matching lines @@
             'objc/RTCVideoRendererAdapter.mm',
             'objc/RTCVideoSource+Private.h',
             'objc/RTCVideoSource.h',
             'objc/RTCVideoSource.mm',
             'objc/RTCVideoTrack+Private.h',
             'objc/RTCVideoTrack.h',
             'objc/RTCVideoTrack.mm',
             'objc/avfoundationvideocapturer.h',
             'objc/avfoundationvideocapturer.mm',
           ],
+          'link_settings': {

[tkchin_webrtc, 2016/02/23 00:22:26]

why do we need this? 

[hjon_webrtc, 2016/02/23 21:06:12]

Your question prompted me to dig into this again. Without this, I received
linker errors about undefined symbols (see below for an example). I compared
against the libjingle_peerconnection_objc target, which also included this link
setting, so I included it to see if it fixed the problem, which it did.

That confuses me a bit, though. Shouldn't linking against libc++ work? As far as
I can tell, this is the only place in AppRTCDemo's dependency chain where
libstdc++ is explicitly used.

It might be easier to show you IRL, so I'll plan on doing that tomorrow.

Undefined symbols for architecture armv7:
  "void std::__1::__sort<std::__1::__less<signed char, signed char>&, signed
char*>(signed char*, signed char*, std::__1::__less<signed char, signed
char>&)", referenced from:
      webrtc::Sort(void*, unsigned int, webrtc::Type) in
libsystem_wrappers.a(system_wrappers.sort.o)
      void boost::detail::spread_sort_rec<signed char*, int, signed char>(signed
char*, signed char*, std::__1::vector<signed char*, std::__1::allocator<signed
char*> >&, unsigned int, std::__1::vector<unsigned long,
std::__1::allocator<unsigned long> >&) in
libsystem_wrappers.a(system_wrappers.sort.o)

+            'libraries': [
+              '-lstdc++',
+            ],
+          },
           'conditions': [
             ['OS=="ios"', {
               'sources': [
                 'objc/RTCEAGLVideoView.h',
                 'objc/RTCEAGLVideoView.m',
               ],
               'all_dependent_settings': {
                 'xcode_settings': {
                   'OTHER_LDFLAGS': [
                     '-framework CoreGraphics',
@@ skipping 146 matching lines @@
               'AdditionalOptions': [
                 '-Wno-sign-compare',
               ],
             },
           },
         }],
       ],
     },  # target libjingle_peerconnection
   ],  # targets
 }