Xcode中的重复符号错误 [英] Duplicate symbol error in Xcode

问题描述

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..

I 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)

。

推荐答案

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。

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.

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。

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.

请在构建设置中将与标准库链接选项设置为否。

Please set the option "Link with Standard Library" to NO in your build setting.

这篇关于Xcode中的重复符号错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！