Warnings with __builtin_choose_expr & __builtin_types_compatible_p

[Ranko Zivojnovic <ranko at spidernet dot net>]

Greetings,

I'm not sure if I'm missing something: when I try to compile the below
test case I get:

[ranko@ranko-home tmp]% gcc -o test-case test-case.c
test-case.c: In function `main':
test-case.c:40: warning: passing arg 1 of `example_func2' from
incompatible pointer type
test-case.c:41: warning: passing arg 1 of `example_func1' from
incompatible pointer type

The code is correct and the correct functions do get executed. I would
like however to get rid of the false warnings during the compilation.

[ranko@ranko-home tmp]% ./test-case
in example_func1()
test: 0
in example_func2()
ts: 30

Thanks and best regards,

Ranko


[ranko@ranko-home tmp]% gcc -v
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--host=i386-redhat-linux
Thread model: posix
gcc version 3.3.2 20031022 (Red Hat Linux 3.3.2-1)


/* test-case.c
 */
#include <stdio.h>
#include <stdlib.h>

typedef struct example {
	int	t1;
	int	t2;
	int	t3;
	int	t4;
} example_t;

unsigned long long
example_func1(unsigned long *ulp)
{
  printf("in example_func1()\n");
  return (0 + *ulp);
}

unsigned long long
example_func2(example_t *tp)
{
  printf("in example_func2()\n");
  return (unsigned long long)(tp->t1 + tp->t2 + tp->t3 + tp->t4);
}

#define example_def(x)	\
  __builtin_choose_expr( \
    __builtin_types_compatible_p(typeof (x), unsigned long), \
      example_func1(&(x)), \
      __builtin_choose_expr( \
        __builtin_types_compatible_p (typeof (x), example_t),	\
          example_func2(&(x)), abort()))

static unsigned long test = 0;
static example_t ts = { 2, 4, 8, 16 };

int
main(int argc, char *argv[])
{
	printf("test: %llu\n", example_def(test));
	printf("ts: %llu\n", example_def(ts));
	return 0;
}


-- 
Ranko Zivojnovic,
IT Director/CTO          ranko@spidernet.net

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