iphone - "_OBJC_CLASS_$_GDataOAuthAuthentication"，引用自 :

Question

我是 ios developement 的新手。我有一个项目在 ios 5.1 模拟器上运行时它工作正常并且没有收到任何错误但是在同一个项目中运行 ios 6.0 时，ios 6.1 模拟器我收到以下错误。可以有人建议我如何解决这个问题吗？

错误:

Undefined symbols for architecture i386:
"_OBJC_CLASS_$_GDataOAuthAuthentication", referenced from:
  objc-class-ref in GDataOAuthViewControllerTouch.o
"_OBJC_CLASS_$_GDataOAuthSignIn", referenced from:
  objc-class-ref in GDataOAuthViewControllerTouch.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

试试这个，

The main problem was,I thought you are using old GData sdk. You just change the compiler to LLVM GCC 4.2 from Apple LLVM 4.2 and it compiles app perfectly.

我已附上屏幕截图供您引用

项目->目标->build设置->构建选项