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List:       linux-ppc
Subject:    RE: Compile problems
From:       Steve Revilak <revilak () umbsky ! cc ! umb ! edu>
Date:       2000-07-10 20:18:01
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> Careful. If the declartion in the .h file is "extern," then the
> problem will remain. If the delcaration in the .h file isn't
> "extern," then multiple definitions will occur and the linker will
> now complain about that unacceptable situation.

Okay, I should have been clearer. You though I had meant something other
than what I thought had I meant :-)

I'll be more explicit:

/* testh.h */
#ifndef TEST_H
#define TEST_H
int a;
void testfun(void);
#endif

/* test1.c */
#include <stdio.h>
#include "test.h"
int main(void) {
  printf("Hello world\n");
  a=2;
  testfun();
  a=4;
  testfun();
  return 0;
}

/* test2.c */
#include <stdio.h>
#include "test.h"
void testfun(void)  {
  printf("Now got into testfun\n");
  printf("a = %i\n",a);
}

% gcc -Wall -ansi test1.c test2.c -o test
% ./test
Hello world
Now got into testfun
a = 2
Now got into testfun
a = 4


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