在标头文件中包含标头不会使它包含在实现文件中-还是我只是使用错误的命令进行编译？

Question

Well, I have a header (my_prog.h) which looks like this:

#ifndef __MY_HEADER_H
#define __MY_HEADER_H
#include <stddef.h>
typedef struct {
    size_t something;
    size_t something_else;
}
void my_func();
#endif

and implementation file (my_prog.c) where I put:

#include "my_prog.h"
static size_t min(size_t a, size_t b) {...}
void my_func() {...}

When I try to compile my_prog.c to object file (I need it for linking with other files) I fet:

error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘min’

The command I use for compiling is:

gcc -c my_prog.c -o my_prog.h

There's no error saying that it couldn't find the source. When I include in implementation file it compiles wihtout issues.

Answer 1

1. Remove the ... from the function body. Having them is a syntax error.

2. You have not given a typedef name to the structure and the ; is missing:

    typedef struct { size_t something; size_t something_else; } foo; ^^^^ 

3. In the compile line, following the -o you are specifying the name of your header file. This is incorrect. If the compilation goes fine(it will if you fix 1 and 2 above) , the compiler the wipe the original contents of my_prog.h and will overwrite it with the object file. Instead do :

    gcc -c my_prog.c -o my_prog.o