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怎样创建一个Xcode插件（Part 2） - CocoaChina_让移动开发更简单
haodewap.netI am encountering 'duplicate symbol' errors in Xcode 4.5.1 when I try to build a project after adding my own framework. I verified the framework files for duplicates and there are none. But when I add the framework to a project, it complains with these error. Please suggest..
duplicate symbol _NXArgc in:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
/Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
duplicate symbol _NXArgv in:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
/Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
duplicate symbol ___progname in:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
/Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
duplicate symbol _environ in:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
/Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
duplicate symbol start in:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
/Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
ld: 8 duplicate symbols for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Thanks in advance..
解决方案 Those symbols are in crt.o, the startup code of standard C library. Normally it should be the entry point of executable file to initialize global variables and objects. It will also call your main function.
But for a framework, you should not include it in your binary because framework should not have main.
I believe you have "Link with Standard Library" option as "YES" in your framework's target build setting. This will link crt.o into your framework. And when you link the framework into a project, there will be duplicated symbols.
Please set the option "Link with Standard Library" to NO in your build setting.
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当我在添加我自己的框架后尝试构建项目时，我遇到了Xcode 4.5.1中的“重复符号”错误。我验证了框架文件的副本，没有。但是当我添加框架到一个项目，它抱怨这些错误。请建议..
重复符号_NXArgc in： /Applications/Xcode.app/Contents/Developer/Platforms/ iPhoneOS.platform / Developer / SDKs / iPhoneOS6.0.sdk / usr / lib / crt1.3.1.o
/Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
重复符号_NXArgv在： /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
/Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
重复符号___progname： /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/ Developer / SDKs / iPhoneOS6.0.sdk / usr / lib / crt1.3.1.o
/Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
重复符号_environ in： /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
/ Users / idcc /Test/MyFW/Products/MyTestFW.framework/MyTestFW
重复符号从： /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/ iPhoneOS6.0.sdk / usr / lib / crt1.3.1.o
/Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
ld：8个架构的重复符号armv7
clang：错误：链接器命令失败，退出代码1（使用-v查看调用）
解决方案 这些符号在crt.o，标准C库的启动代码。通常它应该是可执行文件的入口点来初始化全局变量和对象。它也会调用你的main函数。
但是对于一个框架，你不应该将它包含在二进制文件中，因为框架不应该有main。 我相信你的框架的目标构建设置中有“链接标准库”选项为“YES”。这将链接crt.o到你的框架。
请在构建设置中将“与标准库链接”选项设置为“否”。如果将框架链接到项目中， p>
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