我的应用程序在10.7上运行和测试,但后来意识到我也需要它来处理早期版本。不幸的是,我从一开始就和ARC一起开始了这个项目。
现在,我的构建设置是调试基础sdk:10.7和发布基础sdk:10.6。当我尝试存档我的应用程序时,我得到了以下错误:
Undefined symbols for architecture x86_64:
"_objc_retain", referenced from:
+[__ARCLite__ load] in libarclite_macosx.a(arclite.o)
-[AppDelegate applicationDidFinishLaunching:] in AppDelegate.o
-[AppDelegate managedObjectModel] in AppDelegate.o
-[AppDelegate persistentStoreCoordinator] in AppDelegate.o
-[AppDelegate managedObjectContext] in AppDelegate.o
-[AppDelegate windowWillReturnUndoManager:] in AppDelegate.o
-[AppDelegate saveAction:] in AppDelegate.o
...
(maybe you meant: _objc_retainedObject)
"_objc_release", referenced from:
-[AppDelegate applicationDidFinishLaunching:] in AppDelegate.o
-[AppDelegate applicationFilesDirectory] in AppDelegate.o
-[AppDelegate managedObjectModel] in AppDelegate.o
-[AppDelegate persistentStoreCoordinator] in AppDelegate.o
-[AppDelegate managedObjectContext] in AppDelegate.o
-[AppDelegate windowWillReturnUndoManager:] in AppDelegate.o
-[AppDelegate saveAction:] in AppDelegate.o
...
"_objc_retainAutoreleasedReturnValue", referenced from:
-[AppDelegate applicationFilesDirectory] in AppDelegate.o
-[AppDelegate managedObjectModel] in AppDelegate.o
-[AppDelegate persistentStoreCoordinator] in AppDelegate.o
-[AppDelegate managedObjectContext] in AppDelegate.o
-[AppDelegate windowWillReturnUndoManager:] in AppDelegate.o
-[AppDelegate saveAction:] in AppDelegate.o
-[AppDelegate applicationShouldTerminate:] in AppDelegate.o
...
"_objc_autoreleaseReturnValue", referenced from:
-[AppDelegate applicationFilesDirectory] in AppDelegate.o
-[AppDelegate managedObjectModel] in AppDelegate.o
-[AppDelegate persistentStoreCoordinator] in AppDelegate.o
-[AppDelegate managedObjectContext] in AppDelegate.o
-[AppDelegate windowWillReturnUndoManager:] in AppDelegate.o
-[MainWindowController viewForTag:] in MainWindowController.o
-[MainWindowController tableView:objectValueForTableColumn:row:] in MainWindowController.o
...
"_objc_storeStrong", referenced from:
-[AppDelegate persistentStoreCoordinator] in AppDelegate.o
-[AppDelegate saveAction:] in AppDelegate.o
-[AppDelegate applicationShouldTerminate:] in AppDelegate.o
-[AppDelegate .cxx_destruct] in AppDelegate.o
-[MainWindowController init] in MainWindowController.o
-[MainWindowController viewForTag:] in MainWindowController.o
-[MainWindowController showUserFinderView:] in MainWindowController.o
...
"_objc_retainAutoreleaseReturnValue", referenced from:
+[MainWindowController sharedInstance] in MainWindowController.o
-[FileMetaData getFileName] in FileMetaData.o
-[FileMetaData getLastHash] in FileMetaData.o
-[FileMetaData getCreationDate] in FileMetaData.o
-[FileMetaData getLastModified] in FileMetaData.oe
-[FileMetaData getLocalPath] in FileMetaData.o
...
"_objc_autorelease", referenced from:
-[SBJsonParser objectWithString:error:] in SBJsonParser.o
-[SBJsonTokeniser getStringToken:] in SBJsonTokeniser.o
-[SBJsonTokeniser getNumberToken:] in SBJsonTokeniser.o
-[SBJsonUTF8Stream getRetainedStringFragment:] in SBJsonUTF8Stream.o
-[SBJsonWriter stringWithObject:error:] in SBJsonWriter.o
"_objc_retainAutorelease", referenced from:
-[SBJsonTokeniser getStringToken:] in SBJsonTokeniser.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
这看起来像是ARC的一个问题,但我不知道从哪里开始解决这个问题。有什么建议吗?谢谢
您需要将SDK设置为10.7,但可以将部署目标设置为10.6。尽管这个问题中详细说明了一些注意事项:如何在启用ARC的下部署到Snow Leopard
我今天收到同样的消息时遇到了这个问题。我将SDK设置为10.7,将部署目标设置为10.6,但仍然看到这条消息。
我的项目主要使用现有的手动保留–发布代码,只有几个新文件使用ARC。因此,我在主目标设置中禁用了ARC,并通过在每个文件的构建设置中添加-fobjc-arc
(在构建阶段下),为这两个文件选择性地启用了它。
凭直觉,我在目标中启用了ARC,然后失败了每个文件的设置(删除了两个文件的标志,并将-fno-objc-arc
添加到所有其他文件),在10.6上不再出现动态链接错误。