Xcode4编译过程中一些常见错误

今天在Xcode4开发编译的时候遇到一些错误，上网一查看到有好多人都遇到相同的错误，所以拿出来分享下：

错误1：

 ignoring file /Users/hongyufang/SVNDemo/SVNDemo/Libs/libopenssl.a, file was built for archive which is not the architecture being linked (x86_64): /Users/hongyufang/SVNDemo/SVNDemo/Libs/libopenssl.a

 

这说明你这个工程链接静态库libopenssl.a的时候，工程的Architectures设置不对，可在Build Settings -> Architectures  设置为Standard（32/64 -bit Intel）。

 

错误2：

duplicate symbol _main in:
    /Users/hongyufang/Library/Developer/Xcode/DerivedData/SVNDemo-czyknsriatcctnhcmkteuhbmejfv/Build/Intermediates/SVNDemo.build/Debug/SVNDemo.build/Objects-normal/i386/main-8CDEF0688F8FF878.o
    /Users/hongyufang/Library/Developer/Xcode/DerivedData/SVNDemo-czyknsriatcctnhcmkteuhbmejfv/Build/Intermediates/SVNDemo.build/Debug/SVNDemo.build/Objects-normal/i386/main-CA858FE46BE3346A.o
duplicate symbol _main in:
    /Users/hongyufang/Library/Developer/Xcode/DerivedData/SVNDemo-czyknsriatcctnhcmkteuhbmejfv/Build/Intermediates/SVNDemo.build/Debug/SVNDemo.build/Objects-normal/i386/main-8CDEF0688F8FF878.o
    /Users/hongyufang/Library/Developer/Xcode/DerivedData/SVNDemo-czyknsriatcctnhcmkteuhbmejfv/Build/Intermediates/SVNDemo.build/Debug/SVNDemo.build/Objects-normal/i386/main-E9176508EEFC0477.o
duplicate symbol _main in:
    /Users/hongyufang/Library/Developer/Xcode/DerivedData/SVNDemo-czyknsriatcctnhcmkteuhbmejfv/Build/Intermediates/SVNDemo.build/Debug/SVNDemo.build/Objects-normal/i386/main-8CDEF0688F8FF878.o
    /Users/hongyufang/Library/Developer/Xcode/DerivedData/SVNDemo-czyknsriatcctnhcmkteuhbmejfv/Build/Intermediates/SVNDemo.build/Debug/SVNDemo.build/Objects-normal/i386/main-5AE1FBC181031568.o
ld: 3 duplicate symbols for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

这个说明你这个工程里面有3个相同的函数名main

 

错误3：

NSString *svnhelperPath = [bundle pathForResource:@"svnhelper" ofType:nil];

 

这个svnhelperPath 一直为nil，上网查了一下，有这么几种原因：

      1.你在创建targets的时候，创建了Command Line Tool类型，那么对不起，[NSBund  pathForResource：]取不出来的。

      但是我一定要用Command Line Tool类型呢，也不是没有办法，你可以在选中你的主工程targets（Application）类型 ->Build Phases -> Cope Bundle Resources

     点击 +   把你需要的targets加进来，就ok了。

     2.你在创建targets的时候，直接创建Application类型，ok。