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[yhuiyang]

I am trying to integrate google play game services c++ sdk to my cocos2d-x game, but I failed.
So, I try to run sample NativeGame, but it failed too. (app crashes with same exception)

My test environment:

• Xcode 6.4
• iOS simulator - iphone6 (ios v8.4)
• Google+ iOS sdk v1.7.1
• Google Play Game Services C++ sdk v1.4.1

I am following steps in this get started guide https://developers.google.com/games/services/cpp/gettingStartedIOS

• Open NativeGame.xcodeproj
• Drag and drop google+ ios sdk and play game service c++ sdk to project's Frameworks folder.
• Create game in google play developer console. This get my oauth2 client id and bundle id.
• Setup bundle id in project. This id match the id setup in google play developer console.
• And edit the code, ViewController.mm, to modify variables GPG_CLIENTID, GPG_ACHIEVEMENTID, and GPG_LEADERBOARDID to real value.

When I run NativeGame, click the on screen 'Sign in', app crashes with the following message.

2015-07-30 00:21:38.982 NativeGame[69604:5613222] StartAuthorizationUI
2015-07-30 00:21:39.006 NativeGame[69604:5613325] INFO: Auth operation started: SIGN IN
2015-07-30 00:21:39.024 NativeGame[69604:5613222] -[__NSDictionaryM gtm_httpArgumentsString]: unrecognized selector sent to instance 0x7f801b593540
2015-07-30 00:21:39.031 NativeGame[69604:5613222] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSDictionaryM gtm_httpArgumentsString]: unrecognized selector sent to instance 0x7f801b593540'
*** First throw call stack:
(
0   CoreFoundation                      0x0000000106045c65 __exceptionPreprocess + 165
1   libobjc.A.dylib                     0x0000000105c1ebb7 objc_exception_throw + 45
2   CoreFoundation                      0x000000010604d0ad -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3   CoreFoundation                      0x0000000105fa313c ___forwarding___ + 988
4   CoreFoundation                      0x0000000105fa2cd8 _CF_forwarding_prep_0 + 120
5   NativeGame                          0x0000000102d4c693 -[GPPSignIn oauth2URLWithParams:] + 616
6   NativeGame                          0x0000000102d4c78e -[GPPSignIn doOAuthLoginWithParams:] + 109
7   NativeGame                          0x0000000102d4ce24 -[GPPSignIn authenticateInteractivelyWithParams:] + 77
8   NativeGame                          0x0000000102d4d041 -[GPPSignIn authenticateMaybeInteractively:withParams:] + 528
9   libdispatch.dylib                   0x000000010780f614 _dispatch_client_callout + 8
10  libdispatch.dylib                   0x00000001077fa2fa _dispatch_barrier_sync_f_slow_invoke + 275
11  libdispatch.dylib                   0x000000010780f614 _dispatch_client_callout + 8
12  libdispatch.dylib                   0x00000001077f7a1c _dispatch_main_queue_callback_4CF + 1664
13  CoreFoundation                      0x0000000105fad1f9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
14  CoreFoundation                      0x0000000105f6edcb __CFRunLoopRun + 2043
15  CoreFoundation                      0x0000000105f6e366 CFRunLoopRunSpecific + 470
16  GraphicsServices                    0x0000000107bd1a3e GSEventRunModal + 161
17  UIKit                               0x000000010444c8c0 UIApplicationMain + 1282
18  NativeGame                          0x0000000102702adf main + 111
19  libdyld.dylib                       0x0000000107843145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

What's wrong with my steps?
I am not yet to be asked using which google test account to sign in, no consent screen displayed, and there is no google+ app in the simulator. Does this matter? I do not have real ios device to verify currently.

[ToddKerpelman]

I'd check two things:

1. Did you remember to add the GoogleOpenSource.framework to your project?
2. Did you try adding "-ObjC" to Build Settings > Linking > Other Linker Flags in Xcode?

[yhuiyang]

I didn't add your check item 2, after add '-ObjC' linker flag, sample NativeGame sign in function is working. Thank you very much!

[ToddKerpelman]

You're welcome! That step seems to be missing in the C++ documentation -- I'll ask the team to fix it.