使用带有Swift的C文件导致链接器错误

Question

我正在尝试这个 C库.我已将文件添加到我的项目中,并创建了一个Objective-C文件以跟随github页面上的示例.我已经在我的桥接头中导入了Objc文件,但是当我编译时我

Ld /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Products/Debug-iphoneos/trinkeSwift.app/trinkeSwift normal arm64
    cd /Users/nickporter/Developer/trinkeSwift
    export IPHONEOS_DEPLOYMENT_TARGET=8.0
    export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.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 arm64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.3.sdk -L/Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Products/Debug-iphoneos -F/Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Products/Debug-iphoneos -filelist /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/trinkeSwift.LinkFileList -Xlinker -rpath -Xlinker @executable_path/Frameworks -dead_strip -fobjc-arc -fobjc-link-runtime -L/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphoneos -Xlinker -add_ast_path -Xlinker /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/trinkeSwift.swiftmodule -miphoneos-version-min=8.0 -framework CoreGraphics -framework Foundation -framework UIKit -Xlinker -dependency_info -Xlinker /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/trinkeSwift_dependency_info.dat -o /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Products/Debug-iphoneos/trinkeSwift.app/trinkeSwift

duplicate symbol _str_time in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _mymodifier in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _fromModifier in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _timePointer in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _temp_time in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _set_time in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _curtime in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _initialTime in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _changeAmount in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _fromChangeAmount in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _specAmount in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _finalSpecAmount in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _unusedText in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/DateGenerator.o
duplicate symbol _str_time in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _changeAmount in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _fromChangeAmount in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _temp_time in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _set_time in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _specAmount in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _finalSpecAmount in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _mymodifier in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _fromModifier in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _timePointer in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _curtime in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _initialTime in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
duplicate symbol _unusedText in:
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/TimeParser.o
    /Users/nickporter/Library/Developer/Xcode/DerivedData/trinkeSwift-dhbvybojkdowcfffscchwxwgahyj/Build/Intermediates/trinkeSwift.build/Debug-iphoneos/trinkeSwift.build/Objects-normal/arm64/y.tab.o
ld: 28 duplicate symbols for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我的Objc类中的代码是

+ (NSDate *)dateFromNatrualString:(NSString *)text
{
    NSString *when = text.lowercaseString;
    char *whenstr = (char *)[when UTF8String];
    time_t finalTime = parseDateTimeString(whenstr);
    str_time= localtime(&finalTime);
    NSString *thedate = [NSString stringWithCString:asctime(str_time) encoding:NSUTF8StringEncoding];

    NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
    formatter.dateFormat = @"EEEE MMM dd HH:mm:ss yyyy";


    return [formatter dateFromString:thedate];
}

有谁知道我怎么解决这个问题？

Answer 1

您正在使用的库正在 TimeParser.h 文件中定义符号。每当您将该文件包含在项目中的多个文件中时，您最终都会得到重复的定义。例如，错误日志中的前 3 个条目对应于 TimeParser.h 中定义的变量：str_time、mymodifier和frommodifier。

TimeParser.h 应仅包含声明以避免此问题。为了帮助您了解声明和定义之间的区别，请参阅这篇文章：定义和声明之间有什么区别？