cannot create __weak reference because the current deployment target does not support weak references
xcrun -sdk iphoneos clang -arch arm64 -rewrite-objc -fobjc-arc -fobjc-runtime=ios-8.0.0 xxx.m
cannot create __weak reference because the current deployment target does not support weak references
xcrun -sdk iphoneos clang -arch arm64 -rewrite-objc -fobjc-arc -fobjc-runtime=ios-8.0.0 xxx.m