架构x86_64的未定义符号：（Mac OS X 10.7） [英] Undefined symbols for architecture x86_64: (Mac OS X 10.7)

问题描述

我正在为我的CS类工作一个MP。我们的计算机实验室在Linux操作系统下工作，但我尝试编译在家庭计算机（Mac OS X）上的代码。我收到以下错误：

 架构x86_64的未定义符号：
_tdestroy，引用自：
 _dictionary_destroy in libdictionary.o 
 _dictionary_destroy_free in libdictionary.o 
 ld：没有为架构x86_64找到符号
  

我试图在网上找到一个解决方案，但我没有成功。我们在Makefile中使用以下宏：

  CC = gcc 
 INC = -I。 
 FLAGS = -g -W -Wall 
 LIBS = -lpthread 
  

任何

man-pages / online / pages / man3 / tsearch.3.htmlrel =nofollow> tdestroy ：

  SVr4，POSIX.1-2001。函数tdestroy（）是一个GNU扩展
  

这意味着这个函数不能在OS X

编辑：
在包含之后加入：

  #ifndef _GNU_SOURCE 
 void tdestroy（void * root，void（* free_node）（void * nodep））{} 
 #endif 
  

您可以尝试通过使用twalk / tdelete / free来实现tdestroy - 它应该很难做，但是留空应该也工作（但它会创建一个内存在OSX上泄漏）。

编辑2：添加链接到手册页（10x到Cameron）

I am working on an MP for my CS class. Our computer labs are working under Linux OS, but I tried compiling the code on my home computer (Mac OS X). I am getting the following error:

Undefined symbols for architecture x86_64:
"_tdestroy", referenced from:
_dictionary_destroy in libdictionary.o
_dictionary_destroy_free in libdictionary.o
ld: symbol(s) not found for architecture x86_64

I tried finding a solution online, but I was unsuccessful. We are using the following macros in the Makefile:

CC = gcc
INC = -I.
FLAGS = -g -W -Wall
LIBS = -lpthread

Any ideas?

解决方案

From the GNU man page of tdestroy:

SVr4, POSIX.1-2001. The function tdestroy() is a GNU extension

This means that this function is not available on OS X

EDIT: Put this after the includes:

#ifndef _GNU_SOURCE
void tdestroy(void *root, void (*free_node)(void *nodep)) { }
#endif

You can try to implement tdestroy by using twalk/tdelete/free - it should'n be very hard to do, but leaving it empty should work too (but it will create a memory leak on OSX).

EDIT 2: added link to the man page (10x to Cameron)

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