Fix target_arch for ios devices

talk/app/webrtc/objc/README

 This directory contains the ObjectiveC implementation of the
 webrtc::PeerConnection API.  This can be built for Mac or iOS.  This
 file describes building the API, unit test, and AppRTCDemo sample app.
 
 Prerequisites:
 - Make sure gclient is checking out tools necessary to target iOS: your
   .gclient file should contain a line like:
   target_os = ['ios', 'mac']
   Make sure to re-run gclient sync after adding this to download the tools.
 
 - Set up webrtc-related $GYP_DEFINES; example shell functions that set
   up for building for iOS-device, iOS-simulator, and Mac (resp) are:
 function wrbase() {
   cd /path/to/webrtc/trunk
   export GYP_DEFINES="build_with_libjingle=1 build_with_chromium=0 libjingle_objc=1"

[tkchin_webrtc, 2015/10/27 17:00:19]

remove libjingle_objc=1

   export GYP_GENERATORS="ninja"
 }
 
 function wrios() {
   wrbase
-  export GYP_DEFINES="$GYP_DEFINES OS=ios target_arch=armv7"
+  export GYP_DEFINES="$GYP_DEFINES OS=ios"
   export GYP_GENERATOR_FLAGS="$GYP_GENERATOR_FLAGS output_dir=out_ios"
   export GYP_CROSSCOMPILE=1
 }
 
+function wrios32() {
+  export GYP_DEFINES="$GYP_DEFINES target_arch=arm"

[tkchin_webrtc, 2015/10/27 17:00:19]

wrios first then the export

+  wrios
+}
+
+function wrios64() {
+  export GYP_DEFINES="$GYP_DEFINES target_arch=arm64"
+  wrios
+}
+
 function wrsim() {
   wrbase
   export GYP_DEFINES="$GYP_DEFINES OS=ios target_arch=ia32"

[tkchin_webrtc, 2015/10/27 17:00:19]

this might need a target_subarch=arm32

   export GYP_GENERATOR_FLAGS="$GYP_GENERATOR_FLAGS output_dir=out_sim"
   export GYP_CROSSCOMPILE=1
 }
 
 function wrmac() {
   wrbase
   export GYP_DEFINES="$GYP_DEFINES OS=mac target_arch=x64"

[tkchin_webrtc, 2015/10/27 17:00:19]

this might need a target_subarch=arm64

   export GYP_GENERATOR_FLAGS="$GYP_GENERATOR_FLAGS output_dir=out_mac"
 }
 
 - Finally, run "gclient runhooks" to generate ninja files.

[tkchin_webrtc, 2015/10/27 17:00:19]

replace gclient runhooks with "webrtc/build/gyp_webrtc", here and elsewhere

 
 Example of building & using the unittest & app:
 
 - To build & run the unittest (must target mac):
   wrmac && gclient runhooks && \
       ninja -C out_mac/Debug libjingle_peerconnection_objc_test && \
       ./out_mac/Debug/libjingle_peerconnection_objc_test.app/Contents/MacOS/libjingle_peerconnection_objc_test
 
 - To build & launch the sample app on OSX:
   wrmac && gclient runhooks && ninja -C out_mac/Debug AppRTCDemo && \
       ./out_mac/Debug/AppRTCDemo.app/Contents/MacOS/AppRTCDemo
 
 - To build & launch the sample app on the iOS simulator:
   wrsim && gclient runhooks && ninja -C out_sim/Debug iossim AppRTCDemo && \
       ./out_sim/Debug/iossim out_sim/Debug/AppRTCDemo.app
 
-- To build & sign the sample app for an iOS device:
-  wrios && gclient runhooks && ninja -C out_ios/Debug-iphoneos AppRTCDemo
+- To build & sign the sample app for an iOS device (32 bit):
+  wrios32 && gclient runhooks && ninja -C out_ios/Debug-iphoneos AppRTCDemo

[tkchin_webrtc, 2015/10/27 17:00:19]

wrios32 && webrtc/build/gyp_webrtc && ninja -C out_ios/Debug-iphoneos AppRTCDemo

+
+- To build & sign the sample app for an iOS device (64 bit):
+  wrios64 && gclient runhooks && ninja -C out_ios/Debug-iphoneos AppRTCDemo
 
 - To install the sample app on an iOS device:

[tkchin_webrtc, 2015/10/27 17:00:19]

Delete this section

   ideviceinstaller -i out_ios/Debug-iphoneos/AppRTCDemo.app
   (if installing ideviceinstaller from brew, use --HEAD to get support
   for .app directories)
 - Alternatively, use iPhone Configuration Utility:
   - Open "iPhone Configuration Utility" (http://support.apple.com/kb/DL1465)
   - Click the "Add" icon (command-o)
   - Open the app under out_ios/Debug-iphoneos/AppRTCDemo (should be added to the Applications tab)
   - Click the device's name in the left-hand panel and select the Applications tab
   - Click Install on the AppRTCDemo line.
       (If you have any problems deploying for the first time, check
       the Info.plist file to ensure that the Bundle Identifier matches
       your phone provisioning profile, or use a development wildcard
       provisioning profile.)
 - Alternately, use ios-deploy:
   ios-deploy -d -b out_ios/Debug-iphoneos/AppRTCDemo.app
 
 - Once installed:
   - Tap AppRTCDemo on the iOS device's home screen (might have to scroll to find it).
   - In desktop chrome, navigate to http://apprtc.appspot.com and note
     the r=<NNN> room number in the resulting URL; enter that number
     into the text field on the phone.