Xcode下架构x86_64的重复符号 [英] Duplicate symbols for architecture x86_64 under Xcode

问题描述

我现在对上面的标题有同样的问题，但还没有找到正确的答案。我收到错误：

I now have the same question with above title but have not found the right answer yet. I got the error:

    /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboSDK-Client-cgodalyxmwqzynaxfbbewrooymnq/Build/Intermediates/TestMoboSDK-Client.build/Debug-iphonesimulator/TestMoboSDK-Client.build/Objects-normal/x86_64/MoboSDK.o
    /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboSDK-Client-cgodalyxmwqzynaxfbbewrooymnq/Build/Products/Debug-iphonesimulator/libMoboSDK.a(MoboSDK.o)
duplicate symbol _OBJC_METACLASS_$_MoboSDK in:
    /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboSDK-Client-cgodalyxmwqzynaxfbbewrooymnq/Build/Intermediates/TestMoboSDK-Client.build/Debug-iphonesimulator/TestMoboSDK-Client.build/Objects-normal/x86_64/MoboSDK.o
    /Users/nle/Library/Developer/Xcode/DerivedData/TestMoboSDK-Client-cgodalyxmwqzynaxfbbewrooymnq/Build/Products/Debug-iphonesimulator/libMoboSDK.a(MoboSDK.o)
ld: 75 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

感谢任何帮助。

终于我找出了这个错误的原因，因为我将 -ObjC 添加到其他链接器标志。删除此值后，我可以成功构建我的项目，但我不知道为什么。任何人都可以解释这个吗？

Finally I find out the reason of this error cause I added -ObjC to the Other Linker Flags. After remove this value then I can build my project successfully, but I don't know why. Can anyone explain this?

推荐答案

75个体系结构的重复符号x86_64

75 duplicate symbols for architecture x86_64

表示您已经加载了两次相同的函数。
因为从其他链接器标志中移除 -ObjC 后问题消失，
这意味着此选项导致函数加载两次：

Means that you have loaded same functions twice. As the issue disappear after removing -ObjC from Other Linker Flags, this means that this option result that functions loads twice:

来自Technical Q& A

from Technical Q&A

此标志使链接器加载定义Objective-C类或类的库
中的每个目标文件。虽然这个选项
通常会导致更大的可执行文件（由于加载到应用程序中的额外目标代码
），但它将允许成功创建包含类别的
有效Objective-C静态库on
现有类。

This flag causes the linker to load every object file in the library that defines an Objective-C class or category. While this option will typically result in a larger executable (due to additional object code loaded into the application), it will allow the successful creation of effective Objective-C static libraries that contain categories on existing classes.

https://developer.apple.com/library/content/qa/qa1490/_index.html

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