LD：适用于建筑x86_64的1个重复的符号 [英] ld: 1 duplicate symbol for architecture x86_64

问题描述

我非常非常新的C和C ++编程，并在软件编程经验非常少（在基于Web的我的背景），但我想用C / C ++和X code实验...所以，我发现这个code（和网上很多类似的变异）：

I'm very very new to C and C++ programming, and have very little experience in Software Programming (my background is Web Based) But I'm trying to experiment with C / C++ and Xcode... So I've found this code (and many similar variations online):

#include <stdio.h>

int main()
{
    printf ("Test");
    return 0;
}

然而，当我来到编译它在X $ C $三我收到以下错误：

Yet when I come to compile it in Xcode I get the following error:

> duplicate symbol _main in:
>     /Users/thomas/Library/Developer/Xcode/DerivedData/test-etqojvxbxhxjqeggdzkbfufvbeza/Build/Intermediates/test.build/Debug/test.build/Objects-normal/x86_64/first.o
>     /Users/thomas/Library/Developer/Xcode/DerivedData/test-etqojvxbxhxjqeggdzkbfufvbeza/Build/Intermediates/test.build/Debug/test.build/Objects-normal/x86_64/main.o
> ld: 1 duplicate symbol for architecture x86_64 clang: error: linker
> command failed with exit code 1 (use -v to see invocation)

也许X code是错误的事情对我来说，使用作为一个新手？如果任何人都可以推荐一个更好的编译器，这将是巨大的！

Maybe Xcode is the wrong thing for me to be using as a newbie? If anyone could recommend a better compiler, that would be great too!

推荐答案

当您创建X code上新建一个项目，它会自动给你一个启动文件，的main（）在里面。如果创建一个新的文件，如 first.c ，然后粘贴您的测试code到它，你会被定义主（）两次，并获得该错误。

When you create a new project in Xcode, it automatically gives you a starting file with main() in it. If you created a new file, such as first.c, and then pasted your test code into it, you'll be defining main() twice, and getting that error.

您需要删除的文件（如的main.c 或 main.m文件），其中X code提供了新项目，或者剪切和样品code粘贴到该文件，而不是创建一个新的。

You need to either delete the file (such as main.c, or main.m) that Xcode provides in your new project, or cut and paste your sample code into that file, instead of creating a new one.

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