Thread: Problems compiling two c programs together

setup.c has the global variable login. How come this isn't variable visible in main.c? Here is the code and output that I get.

Code:

$ more setup.c
#include <pwd.h>
#include <string.h>
/*#include "me.h"*/

#define MAXLOGIN 64

char login[MAXLOGIN];

void init(void)
{
  struct passwd *pwd;

  if ((pwd = getpwuid(geteuid())) == NULL)
    strcpy(login, "unknown");
  else
    strcpy(login, pwd->pw_name);
}

Code:

$ more main.c
/*I gave up trying to read Dr. Thalers code*/

#include <stdio.h>
#include <stdlib.h>
/*#include "me.h"*/

int main(int argc, char *argv[]) 
{

  /*begin the clownsuit and bra masturbation session*/
  init();

  printf("%s\n", login);
  exit(EXIT_SUCCESS);
}

$ gcc -g setup.c main.c -o yapp
main.c: In function ‘main’:
main.c:13: error: ‘login’ undeclared (first use in this function)
main.c:13: error: (Each undeclared identifier is reported only once
main.c:13: error: for each function it appears in.)

I don't think you need to specify the size.

Just in case the size might change and someone forgets this file... well, it really doesn't matter.