用7.0.0好好的，昨天升级到7.1.0就编译不了的，库都已经添加了，这到底是缺了什么？？
努力的搜索终于找到问题的，解决办法如下：
重新添加一下CoreMedia.framework
下面是错误信息：
Undefined symbols for architecture x86_64:
"_CMTimeGetSeconds", referenced from:
-[GADVideoPlayer notifyVideoPlayerWithTime:] in GoogleMobileAds(GADVideoPlayer.o)
-[GADVideoPlayer notifyVideoReadyToPlay] in GoogleMobileAds(GADVideoPlayer.o)
"_CMTimeMake", referenced from:
-[GADVideoPlayer observePlayer] in GoogleMobileAds(GADVideoPlayer.o)
"_CMTimeMakeWithSeconds", referenced from:
-[GADVideoPlayer seekToTime:] in GoogleMobileAds(GADVideoPlayer.o)
"_kCMTimeZero", referenced from:
-[GADVideoPlayer setAudioMixVolume:] in GoogleMobileAds(GADVideoPlayer.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)