xcode6_beta build fix: Undefined symbols _fwrite$UNIX2003

使用xcode6 编译cocos2dx会有以下错误

Undefined symbols for architecture i386:
  "_fwrite$UNIX2003", referenced from:
      _unixErrorHandler in libcocos2dx iOS.a(tif_unix.o)
      _unixWarningHandler in libcocos2dx iOS.a(tif_unix.o)
      _empty_output_buffer in libcocos2dx iOS.a(jdatadst.o)
      _term_destination in libcocos2dx iOS.a(jdatadst.o)
      _Fax3PrintDir in libcocos2dx iOS.a(tif_fax3.o)
      _PredictorPrintDir in libcocos2dx iOS.a(tif_predict.o)
  "_strerror$UNIX2003", referenced from:
      _TIFFOpen in libcocos2dx iOS.a(tif_unix.o)
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

google后发现, http://stackoverflow.com/questions/8732393/code-coverage-with-xcode-4-2-missing-files ,针对2dx的只需要在AppDelegate.cpp的最后面添加:

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extern "C"{
    size_t fwrite$UNIX2003( const void *a, size_t b, size_t c, FILE *d )
    {
        return fwrite(a, b, c, d);
    }
    char* strerror$UNIX2003( int errnum )
    {
        return strerror(errnum);
    }
}

即可