Objective c Mountain Lion中的GCDAsyncSocket问题

我在Mac（Objective-C）应用程序中使用GCDAsyncSocket类时遇到问题。以下是我得到的错误：

Apple Mach-O Linker (Id) Error

Ld "/Users/matthewdahl/Library/Developer/Xcode/DerivedData/Server_Tester-fkkcdricfunsmwcdnerorqdtqetc/
  Build/Products/Debug/Server Tester.app/Contents/MacOS/Server Tester" normal x86_64
    cd "/Volumes/Data/Programming/ControlTouch/P12127/Server Tester"
    setenv MACOSX_DEPLOYMENT_TARGET 10.8

    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch
  x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
  MacOSX10.8.sdk -L/Users/matthewdahl/Library/Developer/Xcode/DerivedData/Server_Tester-
  fkkcdricfunsmwcdnerorqdtqetc/Build/Products/Debug -L/Applications/Xcode.app/Contents/Developer/
  Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/lib/system -F/Users/matthewdahl/Library/
  Developer/Xcode/DerivedData/Server_Tester-fkkcdricfunsmwcdnerorqdtqetc/Build/Products/Debug -filelist 
  "/Users/matthewdahl/Library/Developer/Xcode/DerivedData/Server_Tester-fkkcdricfunsmwcdnerorqdtqetc/
  Build/Intermediates/Server Tester.build/Debug/Server Tester.build/Objects-normal/x86_64/Server 
  Tester.LinkFileList" -mmacosx-version-min=10.8 -fobjc-arc -fobjc-link-runtime -framework Security -
  framework Cocoa -o "/Users/matthewdahl/Library/Developer/Xcode/DerivedData/Server_Tester-
  fkkcdricfunsmwcdnerorqdtqetc/Build/Products/Debug/Server Tester.app/Contents/MacOS/Server Tester"

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_GCDAsyncSocket", referenced from:
      objc-class-ref in ServerTesterAppDelegate.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

---

我真的很难理解这里的问题。我已尝试删除并重新添加GCDAsyncSocket.h和.m文件。我已验证所有导入都是导入.h文件而不是.m文件。我已经清理了这个项目，甚至尝试从头开始做一个新项目。任何对可能导致这种情况的原因的洞察都是非常好的。（注意：我刚升级到Mountain Lion-不确定它是否是罪魁祸首）

转到项目>目标>构建阶段>编译源代码。您的所有.m文件都在列表中吗？

转到项目>目标>构建阶段>编译源代码。您所有的.m文件都在列表中吗？哇，非常感谢。不确定为什么它没有自动添加m文件，但这解决了它。