From: e-mail DOT address AT end DOT of DOT text (Mike Collins)
Newsgroups: comp.os.msdos.djgpp
Subject: Compiler warning - bad parameter
Date: 14 Nov 1997 10:57:18 GMT
Organization: Storage Technology Limited
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To: djgpp AT delorie DOT com
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Folks,

I am writing a program which involves qsort(). When I compile it, I get a 
warning message :

 Compiling: test2.c
 In function `main':
 test2.c(19) Warning:  passing arg 4 of `qsort' from incompatible pointer type
 no errors

The program runs fine, though not in the "bare-bones" form below, of course. 
This is simply the minimum program that still gives the compile warning. 
I want to get rid of the warning, but though I have tried a lot of different 
things, I can't see where the incompatibility in the pointers lies. Another 
compiler does not give any warning.

Can you help?

Mike.

The program is below:



#include <stdio.h>

struct BOOKER_ITEM
{ char refnum[7];
};

// func definition pulled out of <stdlib.h>

void	qsort(void *_base, size_t _nelem, size_t _size,
	      int (*_cmp)(const void *_e1, const void *_e2));
int comp_ref(struct BOOKER_ITEM *s1, struct BOOKER_ITEM *s2);

main()
{
  int known_records;
  struct BOOKER_ITEM *book_lst;

  qsort(book_lst, known_records, sizeof(struct BOOKER_ITEM), comp_ref);
}

int comp_ref(struct BOOKER_ITEM *s1, struct BOOKER_ITEM *s2)
{ return strncmp(s1->refnum, s2->refnum, sizeof(s1->refnum));
}

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