如何在没有main函数的情况下编译C源代码？

How can I compile my C source files without needing to put a main function within them?

如何编译我的C源文件而不需要在其中放置主函数？

I get an error for the .cfiles that have no main function and don't want to have to add the main function just for compilation.

我得到一个没有main函数的.cfiles错误，并且不想只为编译添加main函数。

4 个解决方案

#1

On GCC, the -c switch is what you want.

在GCC上，-c开关是你想要的。

-c means "compile, don't link", and you get a name.o output file.

-c表示“编译，不链接”，并且您获得name.o输出文件。

#2

Use the -c option of your compiler (works for GCC, option probably identical for other c compilers).

使用编译器的-c选项（适用于GCC，选项可能与其他c编译器相同）。

From GCC's man page:

来自GCC的手册页：

When you invoke GCC, it normally does preprocessing, compilation, assembly and linking. The "overall options" allow you to stop this process at an intermediate stage. For example, the -c option says not to run the linker. Then the output consists of object files output by the assembler.

当您调用GCC时，它通常会进行预处理，编译，汇编和链接。 “整体选项”允许您在中间阶段停止此过程。例如，-c选项表示不运行链接器。然后输出由汇编器输出的目标文件组成。

The linking phase is the step that looks for main() and complains if it doesn't find it.

链接阶段是查找main（）的步骤，如果找不到则抱怨。

#3

Suppose you have hello.c:

假设你有hello.c：

#include<stdio.h>
#include<stdlib.h>
_start()
{
   exit(my_main());
}
int my_main()
{
   printf("Hello");
   return 0;
}

Compile as:

编译为：

gcc  -nostartfiles  hello.c

and you can get an executable out of it.

你可以从中获得一个可执行文件。

#4

You can compile individual files without main, but you cannot link them and of course cannot run them since they are not complete programs. Note that valgrind is not a static analysis tool but a runtime tool, and therefore it is useless on individual translation units not linked into a runnable program.

您可以编译没有main的单个文件，但是您无法链接它们，当然也不能运行它们，因为它们不是完整的程序。请注意，valgrind不是静态分析工具，而是运行时工具，因此对未链接到可运行程序的各个转换单元无效。

If you want to test individual files, a common practice is to include something like the following in each file:

如果要测试单个文件，通常的做法是在每个文件中包含以下内容：

#ifdef UNIT_TEST
int main(int argc, char **argv)
{
    /* unit test code goes here */
}
#endif

And compile the file with -DUNIT_TEST.

并使用-DUNIT_TEST编译该文件。

#1