最近遇到的问题：cocos2d-x xcode6新建工程编译不过,是我朋友找到的解决办法，这里记录一下
报错
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)

Undefined symbols for architecture x86_64:
"_opendir$INODE64", referenced from:
 _OPENSSL_DIR_read in libcocos2dx iOS.a(o_dir.o)
"_readdir$INODE64", referenced from:
 _OPENSSL_DIR_read in libcocos2dx iOS.a(o_dir.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

解决方案：

extern "C"
{
    //新增代码
#if defined (__unix) || (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
#ifndef __ENABLE_COMPATIBILITY_WITH_UNIX_2003__
#define __ENABLE_COMPATIBILITY_WITH_UNIX_2003__
#include <stdio.h>
#include <dirent.h>
FILE *fopen$UNIX2003( const char *filename, const char *mode )
{
return fopen(filename, mode);
}
size_t fwrite$UNIX2003( const void *a, size_t b, size_t c, FILE *d )
{
return fwrite(a, b, c, d);
}
char *strerror$UNIX2003( int errnum )
{
return strerror(errnum);
}
DIR *opendir$INODE64(const char * a)
{
return opendir(a);
}
struct dirent *readdir$INODE64(DIR *dir)
{
return readdir(dir);
}
#endif
#endif
      //结束
#include "png.h"
#include "tiffio.h"
#include "base/etc1.h"
#include "jpeglib.h"
}