C未定义参考 [英] C Undefined reference
本文介绍了C未定义参考的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有以下代码:
main.c
#include "checksum.h"
void main()
{
char *Buf ="GPGGA204502.005106.9813N11402.2921W1090.91065.02M-16.27M";
checksum(Buf);
}
checksum.c
checksum.c
#include <stdio.h>
#include <string.h>
checksum(char *Buff)
{
int i;
unsigned char XOR;
unsigned long iLen = strlen(Buff);
printf("Calculating checksum...\n");
for (XOR = 0, i = 0; i < iLen; i++)
XOR ^= (unsigned char)Buff[i];
printf("%X \n",XOR);
}
checksum.h
checksum.h
#ifndef CHECKSUM_H_INCLUDED
#define CHECKSUM_H_INCLUDED
void checksum(char *Buff);
#endif
编译时出现以下错误:
/tmp/ccFQS7Ih.o: In function `main':
main.c:(.text+0x18): undefined reference to `checksum'
collect2: ld returned 1 exit status
我不知道是什么问题?
推荐答案
您仅编译一个文件,而不是两个.更准确地说,您不是将文件链接在一起.
You are compiling only one file not both. More precisely, you are not linking the files together.
我不知道您的编译器,但是使用gcc,会是这样的:
I don't know your compiler, but with gcc, it would be something like this:
gcc -c main.c <-- compile only
gcc -c checksum.c <-- compile only
gcc main.o checksum.o <-- link the two
编辑:要自动执行此过程,请查看 Makefile
To automate this process, take a look at the make
program which reads Makefile
s.
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