C链接错误:未定义对"main"的引用 [英] C Linking Error: undefined reference to 'main'

问题描述

我已经阅读了有关该主题的其他答案，但不幸的是，它们并没有帮助我.我试图将多个C程序链接在一起，但在响应时出现错误:

I have read the other answers on this topic, and unfortunately they have not helped me. I am attempting to link several c programs together, and I am getting an error in response:

$ gcc -o runexp.o scd.o data_proc.o -lm -fopenmp
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
make: * [runexp] Error 1

我只有一个主要功能，它在runexp中.表格是

I have exactly one main function and it is in runexp. The form is

int main(void) {
    ...; 
    return 0;
}

关于为什么会出现此错误的任何想法?谢谢！

Any thoughts on why I might get this error? Thanks!

推荐答案

您应该在-o选项之后提供输出文件名.在您的情况下，runexp.o被视为输出文件名，而不是输入目标文件，因此您的main函数未定义.

You should provide output file name after -o option. In your case runexp.o is treated as output file name, not input object file and thus your main function is undefined.

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