iOS - Xcode 5 Clang 错误答案

【问题标题】：iOS - Xcode 5 Clang ErroriOS - Xcode 5 Clang 错误
【发布时间】：2013-11-15 22:53:12
【问题描述】：

我在 Xcode 5 中制作原型时出现了很多错误，所以我决定回到绘图板上开始一个新项目。当我创建新项目时，它和上一个项目一样出现了 clang 错误。

这就是它所说的

Ld /Users/jaydenkelly/Library/Developer/Xcode/DerivedData/Trivia_in_a_Jar-cqzkvawfethhydcaldqtecmwfkkm/Build/Products/Debug-iphonesimulator/Trivia\ in\ a\ Jar.app/Trivia\ in\ a\ Jar normal i386
    cd "/Users/jaydenkelly/Desktop/Trivia in a Jar"
    setenv IPHONEOS_DEPLOYMENT_TARGET 7.0
    setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0.sdk -L/Users/jaydenkelly/Library/Developer/Xcode/DerivedData/Trivia_in_a_Jar-cqzkvawfethhydcaldqtecmwfkkm/Build/Products/Debug-iphonesimulator -F/Users/jaydenkelly/Library/Developer/Xcode/DerivedData/Trivia_in_a_Jar-cqzkvawfethhydcaldqtecmwfkkm/Build/Products/Debug-iphonesimulator -filelist /Users/jaydenkelly/Library/Developer/Xcode/DerivedData/Trivia_in_a_Jar-cqzkvawfethhydcaldqtecmwfkkm/Build/Intermediates/Trivia\ in\ a\ Jar.build/Debug-iphonesimulator/Trivia\ in\ a\ Jar.build/Objects-normal/i386/Trivia\ in\ a\ Jar.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=7.0 -framework CoreGraphics -framework UIKit -framework Foundation -Xlinker -dependency_info -Xlinker /Users/jaydenkelly/Library/Developer/Xcode/DerivedData/Trivia_in_a_Jar-cqzkvawfethhydcaldqtecmwfkkm/Build/Intermediates/Trivia\ in\ a\ Jar.build/Debug-iphonesimulator/Trivia\ in\ a\ Jar.build/Objects-normal/i386/Trivia\ in\ a\ Jar_dependency_info.dat -o /Users/jaydenkelly/Library/Developer/Xcode/DerivedData/Trivia_in_a_Jar-cqzkvawfethhydcaldqtecmwfkkm/Build/Products/Debug-iphonesimulator/Trivia\ in\ a\ Jar.app/Trivia\ in\ a\ Jar

duplicate symbol _i in:
    /Users/jaydenkelly/Library/Developer/Xcode/DerivedData/Trivia_in_a_Jar-cqzkvawfethhydcaldqtecmwfkkm/Build/Intermediates/Trivia in a Jar.build/Debug-iphonesimulator/Trivia in a Jar.build/Objects-normal/i386/Game.o
    /Users/jaydenkelly/Library/Developer/Xcode/DerivedData/Trivia_in_a_Jar-cqzkvawfethhydcaldqtecmwfkkm/Build/Intermediates/Trivia in a Jar.build/Debug-iphonesimulator/Trivia in a Jar.build/Objects-normal/i386/Test.o
ld: 1 duplicate symbol for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

【问题讨论】：

确保您没有导入.m 文件。
能分享一下Game.o和Test.o的内容吗？您必须在它们碰撞的范围内声明两个名为“i”的事物。

标签： ios objective-c ld duplicate-symbol

【解决方案1】：

看起来您有两个全局变量_i，一个在Game.m 中，一个在Test.m 文件中。如果您不需要它们在整个程序中可见，只需将它们设为 static。

【讨论】：