ld：重复符号 [英] ld: duplicate symbol

问题描述

我正在学校项目，我从Xcode得到一些奇怪的错误。我使用TextMate的Command + R函数来编译项目。编译似乎工作正常，但链接失败与错误消息我不明白。

I'm working on a school project and I'm getting some weird errors from Xcode. I'm using TextMate's Command+R function to compile the project. Compilation seems to work okay but linking fails with an error message I don't understand.

ld输出：

ld：重复符号text_field（std :: basic_istream >&）in /path/final/build/final.build/Release/final.build/Objects-normal/ppc/generics.o和/path/final/build/final.build/Release/final.build/Objects -normal / ppc / main.o
collect2：ld返回1退出状态

ld: duplicate symbol text_field(std::basic_istream >&)in /path/final/build/final.build/Release/final.build/Objects-normal/ppc/generics.o and /path/final/build/final.build/Release/final.build/Objects-normal/ppc/main.o collect2: ld returned 1 exit status

下面是我的文件io_functions.cpp是整个项目中text_field的唯一声明。

Below is my file io_functions.cpp This is the only declaration of text_field in the entire project.

#include <string>
#include <iostream>
#include <iomanip>

using namespace std;

#ifndef ENDF
#define ENDF '|'
#define ENDR '\n'

/**
reads one field from a given input stream
Usage: var = text_field(in)
*/
string text_field(istream &in){
	string s;
	getline(in, s, ENDF);
	return s; 
}

long long_field(istream &in){
	return atol(text_field(in).c_str()); 
}

int int_field(istream &in){
	return atoi(text_field(in).c_str()); 
}

double double_field(istream &in){
	return atof(text_field(in).c_str()); 
}

#endif

出了什么问题？由于很多原因，我不想发布我的项目的整个来源。

What is going wrong? For a number of reasons I don't want to post my project's entire source.

推荐答案

我的第一个想法是，你在链接器命令中包含它两次，但它似乎抱怨有同样的函数 main.o 和 generics.o 。

My first thought was that you're including it twice on the linker command but it appears to be complaining about having the same function in main.o and generics.o.

因此，您似乎将 io_functions.cpp 文件包含在 main.cpp 和<$ c $

So it looks like you're including the io_functions.cpp file into the main.cpp and generics.cpp which is a bad idea at the best of times.

你应该有一个头文件（例如， io_functions.h ），它指定 io_functions.cpp 中包含的所有内容，并将头两个。

You should have a header file (e.g., io_functions.h) that specifies everything contained in io_functions.cpp and include that header file into the other two.

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