定位iPhoneSimulator时，在Xcode中链接错误
更新：
我刚刚意识到，通过设置LD_TRACE_ARCHIVES和LD_TRACE_DYLIBS环境variables，然后直接在命令行上运行链接器命令，可以获得更多信息。 这是我正在执行，然后它的输出（尽pipe我用<short-text >stringreplace了一些非常长的path和名称）：
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk -L<path_to_project>/build/Debug-iphonesimulator -L<path_to_static_libs> -F<path_to_project>/build/Debug-iphonesimulator -filelist <path_to_project>/build/<project_name>.build/Debug-iphonesimulator/<project_name>.build/Objects-normal/i386/<project_name>.LinkFileList -mmacosx-version-min=10.6 --verbose -lproject_lib -Xlinker -objc_abi_version -Xlinker 2 -framework Foundation -framework UIKit -framework OpenGLES -framework QuartzCore -o <path_to_project>/build/Debug-iphonesimulator/<project_name>.app/<project_name> Using built-in specs. Target: i686-apple-darwin10 Thread model: posix gcc version 4.2.1 (Apple Inc. build 5664) /Developer/usr/bin/../libexec/gcc/i686-apple-darwin10/4.2.1/collect2 -dynamic -arch i386 -macosx_version_min 10.6 -syslibroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk -weak_reference_mismatches non-weak -o <path_to_project>/build/Debug-iphonesimulator/<project_name>.app/<project_name> -lcrt1.10.6.o -L<path_to_project>/build/Debug-iphonesimulator -L<path_to_static_libs> -L/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/usr/lib -L/Developer/usr/bin/../lib/gcc/i686-apple-darwin10/4.2.1 -L/Developer/usr/bin/../lib/gcc -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/Developer/usr/bin/../lib/gcc/i686-apple-darwin10/4.2.1/../../../i686-apple-darwin10/4.2.1 -L/Developer/usr/bin/../lib/gcc/i686-apple-darwin10/4.2.1/../../.. -L/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../.. -filelist <path_to_project>/build/<project_name>.build/Debug-iphonesimulator/<project_name>.build/Objects-normal/i386/<project_name>.LinkFileList -lproject_lib -objc_abi_version 2 -framework Foundation -framework UIKit -framework OpenGLES -framework QuartzCore -lstdc++ -lSystem -lgcc -lSystem -F<path_to_project>/build/Debug-iphonesimulator [Logging for XBS] Used dynamic library: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/System/Library/Frameworks/Foundation.framework/Foundation [Logging for XBS] Used dynamic library: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/System/Library/Frameworks/UIKit.framework/UIKit [Logging for XBS] Used dynamic library: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/System/Library/Frameworks/OpenGLES.framework/OpenGLES [Logging for XBS] Used dynamic library: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/System/Library/Frameworks/QuartzCore.framework/QuartzCore [Logging for XBS] Used dynamic library: /Developer/usr/lib/gcc/i686-apple-darwin10/4.2.1/libstdc++.dylib [Logging for XBS] Used dynamic library: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/usr/lib/libSystem.dylib [Logging for XBS] Used indirect dynamic library: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/usr/lib/libobjc.A.dylib [Logging for XBS] Used indirect dynamic library: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation [Logging for XBS] Used indirect dynamic library: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/usr/lib/system/libSystem.override.dylib [Logging for XBS] Used indirect dynamic library: /usr/lib/libSystem.B.dylib [Logging for XBS] Used indirect dynamic library: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/usr/lib/system/libmathCommon.A.dylib [Logging for XBS] Used static archive: <path_to_static_libs>/libproject_lib.a Undefined symbols: ".objc_class_name_NSBundle", referenced from: literal-pointer@__OBJC@__cls_refs@NSBundle in libproject_lib.a(file1.o) ".objc_class_name_UIWindow", referenced from: literal-pointer@__OBJC@__cls_refs@UIWindow in libproject_lib.a(file2.o) ".objc_class_name_UIView", referenced from: .objc_class_name_file3 in libproject_lib.a(file3.o) ".objc_class_name_CAEAGLLayer", referenced from: literal-pointer@__OBJC@__cls_refs@CAEAGLLayer in libproject_lib.a(file3.o) ".objc_class_name_EAGLContext", referenced from: literal-pointer@__OBJC@__cls_refs@EAGLContext in libproject_lib.a(file2.o) literal-pointer@__OBJC@__cls_refs@EAGLContext in libproject_lib.a(file3.o) ".objc_class_name_NSDictionary", referenced from: literal-pointer@__OBJC@__cls_refs@NSDictionary in libproject_lib.a(file3.o) ".objc_class_name_NSNumber", referenced from: literal-pointer@__OBJC@__cls_refs@NSNumber in libproject_lib.a(file3.o) ".objc_class_name_UIScreen", referenced from: literal-pointer@__OBJC@__cls_refs@UIScreen in libproject_lib.a(file2.o) ld: symbol(s) not found collect2: ld returned 1 exit status
所以问题是：即使collect2正在查找iPhoneSimulator的正确框架位置，为什么没有find.objc_class_name_xxx引用？ 这里的重点是，这一切工作正常，没有链接错误，当瞄准iPhone设备本身。
原始信息：
我有一个应用程序编译和链接罚款目标设备本身（iPad）的时候，但是当我尝试目标模拟器，我得到错误，指示从我使用的框架符号没有find。
我已经看到一些相关的老线程，但他们的build议不起作用：1）我没有在本地复制iPhoneOS SDK框架2）我没有一个明确的框架searchpath3）但是，我有明确的库searchpath，一个用于模拟器，一个用于设备。 4）我尝试制作明确的框架searchpath，一个用于模拟器，一个用于设备，但是也不起作用，尽pipe生成的gcc命令行具有用于模拟器的正确的-syslib和-F选项。
我已经坚持了很长一段时间了。 有没有人有进一步的了解可能会发生什么？ 我只是连接了4个基础框架，Foundation，UIKit，QuartzCore和OpenGLES。
谢谢，
-Eric
我终于明白了这一点：
问题是在我的静态库中，外部引用没有正确生成，因为我不知道在构build静态库的模块时我需要-fobjc-abi-version = 2命令行选项。
主要的困惑是，这个命令行选项在瞄准设备时是不必要的（尽pipe我相信在这种情况下它是无害的），但是在瞄准模拟器时这是必须的。
所以，如果你正在为将要链接到iOS目标的模块创buildmakefiles，请确保包含此选项！
-Eric