...未定义的参考... collect2：LD返回1退出状态 [英] … undefined reference to … collect2: ld returned 1 exit status

问题描述

我在编译和我想不通为什么...是我heapsort.h应该有一个出口型？当有一些错误

heapsort.c

 的#include＆LT;＆stdio.h中GT; //标准库已经包含在list.h
＃包括LT＆;＆stdlib.h中GT;＃包括heap.h
＃包括heapsort.h无效堆排序为（int *键，诠释numKeys）{
   heapHndl H = NULL;
   H = buildHeap（numKeys，钥匙，numKeys）;
   的for（int i = 1; I＆LT; numKeys;我++）{
      键[I] =包括maxValue（H）;
      deleteMax（H）;
   }
   freeHeap（安培; H）;
}
 

---

heapsort.h：

 的#ifndef _HEAPSORT_H_INCLUDE_
＃定义_HEAPSORT_H_INCLUDE_＃包括LT＆;＆stdio.h中GT;
＃包括LT＆;＆stdlib.h中GT;无效堆排序为（int *键，诠释numKeys）;＃万一
 

---

当我去和我的客户端程序编译，我得到在编译时这个错误：

  HeapClient.o：在函数'主'：
HeapClient.c :( text.startup + 0x1a3）：未定义的参考`堆排序'
 

解决方案

C（和C ++）区分大小写。你的函数被调用堆排序。您HeapClient.c显然是呼吁堆排序，因此链接器抱怨说，它不能在任何地方找到堆排序功能。修正了错字，它应该链接。

I'm having some errors when compiling and I can't figure out why...is my heapsort.h supposed to have an exported type?

heapsort.c

#include <stdio.h>        // standard libraries already included in "list.h"
#include <stdlib.h>

#include "heap.h"
#include "heapsort.h"

void heapSort(int* keys, int numKeys){
   heapHndl H = NULL;
   H = buildHeap(numKeys, keys, numKeys);
   for (int i = 1; i < numKeys; i++){
      keys[i] = maxValue(H);
      deleteMax(H);
   }
   freeHeap(&H);
}

---

heapsort.h:

#ifndef _HEAPSORT_H_INCLUDE_
#define _HEAPSORT_H_INCLUDE_

#include <stdio.h>
#include <stdlib.h>

void heapSort(int* keys, int numKeys);

#endif

---

when I go to compile with my client program I get this error upon compilation:

HeapClient.o: In function `main':
HeapClient.c:(.text.startup+0x1a3): undefined reference to `heapsort'"

解决方案

C (and C++) is case sensitive. Your function is called heapSort. Your HeapClient.c is apparently calling heapsort, so the linker complains that it can't find a heapsort function anywhere. Fix that typo and it should link.

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