Multiple attempts to fix Error: linker command failed with exit code 1

Question

过去几天我一直在处理这个错误，但真的被困住了。我一直收到链接器命令错误并且无法通过它。我在网上搜索并尝试了所有提示：检查重复文件、重新安装 pods、将活动架构设置为 NO、删除派生数据、清理多次。

这是我得到的输出：

duplicate symbol _OBJC_IVAR_$_SessionPlayer._nextEvent in:
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayer.o
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayerViewController.o
duplicate symbol _OBJC_IVAR_$_SessionPlayer._visitors in:
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayer.o
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayerViewController.o
duplicate symbol _OBJC_IVAR_$_SessionPlayer._currentSessionTimeInMilliseconds in:
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayer.o
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayerViewController.o
duplicate symbol _OBJC_IVAR_$_SessionPlayer._systemTimeInMilliseconds in:
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayer.o
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayerViewController.o
duplicate symbol _OBJC_CLASS_$_SessionPlayer in:
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayer.o
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayerViewController.o
duplicate symbol _OBJC_METACLASS_$_SessionPlayer in:
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayer.o
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayerViewController.o
duplicate symbol _OBJC_IVAR_$_SessionPlayer._isPlaying in:
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayer.o
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayerViewController.o
duplicate symbol _OBJC_IVAR_$_SessionPlayer._useTiming in:
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayer.o
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayerViewController.o
duplicate symbol _OBJC_IVAR_$_SessionPlayer._delegate in:
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayer.o
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayerViewController.o
duplicate symbol _OBJC_IVAR_$_SessionPlayer._timeline in:
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayer.o
/Users/user1/Library/Developer/Xcode/DerivedData/***-APP-NAME-bahimtombyapwkcekphmmbaifpqx/Build/Intermediates/***-APP-NAME.build/Debug-iphonesimulator/***-APP-NAME.build/Objects-normal/x86_64/SessionPlayerViewController.o

ld: 10 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

真的不知道怎么办，很郁闷

编辑： 发现我的所有文件都被编译了两次，这可能是问题所在。

Answer 1

听起来您在目标构建中包含了两次 SessionPlayer.m 的源代码。根据一些评论，这可能是因为您通过 pod（这就是您想要的）隐式引用了文件，并且通过 a 显式直接 reference/inclusion（您不想要；这就是 pods 的用途）。尝试执行以下操作（我会尽量在文字中表达清楚，但如果您有任何问题，我可以附上屏幕截图）：

在项目导航器窗格中，select 您的项目。
在项目编辑器 window 中，select 您的应用目标（确保它不是 UnitTest/LogicTest 目标）。
沿着项目编辑器的顶部window、select "Build Phases"
在主项目编辑器 window 中，现在应该有一个可扩展部分的列表，其中之一是 "Compile Source (xxx items)"，其中 xxx 是用于构建目标的源文件数。展开该部分。
在 search/filter 文本字段中（项目编辑器的右上角，占位符文本为 "Filter"），输入 "SessionPlayer"
我怀疑您在此处明确包含了 SessionPlayer.m，因此您应该至少在列表中看到一个实例。通过select点击出现在列表底部的“-”按钮将其删除。
尝试重建并查看至少与 SessionPlayer.m 相关的链接器错误是否消失。如果是这样，请对任何其他此类文件重复前面的步骤。

希望对您有所帮助。

Multiple attempts to fix Error: linker command failed with exit code 1

Multiple attempts to fix Error: linker command failed with exit code 1

xcode

objective-c

linker-errors