构建 iOS 项目得到架构 i386 错误的重复符号
Build iOS project got duplicate symbols for architecture i386 error
我在我的项目中使用 paho MQTT 库。
当我在模拟器上构建项目时，出现以下错误。
duplicate symbol _client_version_eye in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTClient.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTAsync.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTAsync.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTProtocolClient.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/Socket.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPersistence.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/Thread.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTProtocolOut.o
ld: 25 duplicate symbols for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
试一试....
当您将一个文件的内容复制并粘贴到另一个具有其接口名称的文件时，可能会出现错误，这意味着两个 类 具有相同的接口名称。
在您的代码中，您有两个具有相同接口名称的不同文件。
这个问题很可能是由于包含页眉时的拼写错误造成的。
检查以确保包含头文件 (.h) 而不是实现文件 (.m)。
同时清理你的项目和构建文件夹，有时它也会解决这个错误
同时删除派生数据。
MQTTClient.c 和 MQTTAsync.c 不应包含在同一个项目中。它们用于构建不同的库。决定您是想要阻塞还是异步行为并使用该文件。
我在我的项目中使用 paho MQTT 库。
当我在模拟器上构建项目时，出现以下错误。
duplicate symbol _client_version_eye in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTClient.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTAsync.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTAsync.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTProtocolClient.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/Socket.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPersistence.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/Thread.o
duplicate symbol _Log_levels in:
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTPacket.o
/Users/xieweizhi/Library/Developer/Xcode/DerivedData/mgiosapp-bctgnqpjhalyqageaduowfwrsrkh/Build/Intermediates/mgiosapp.build/Debug-iphonesimulator/mgiosapp.build/Objects-normal/i386/MQTTProtocolOut.o
ld: 25 duplicate symbols for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
试一试....
当您将一个文件的内容复制并粘贴到另一个具有其接口名称的文件时，可能会出现错误，这意味着两个 类 具有相同的接口名称。
在您的代码中，您有两个具有相同接口名称的不同文件。
这个问题很可能是由于包含页眉时的拼写错误造成的。
检查以确保包含头文件 (.h) 而不是实现文件 (.m)。
同时清理你的项目和构建文件夹，有时它也会解决这个错误
同时删除派生数据。
MQTTClient.c 和 MQTTAsync.c 不应包含在同一个项目中。它们用于构建不同的库。决定您是想要阻塞还是异步行为并使用该文件。