Re: [MiNT] How serious is GCC "cast increases requiered alignment of target type" warning?

[m0n0 <ole@monochrom.net>]

Am Mittwoch, den 26.05.2010, 13:56 +0200 schrieb Vincent Rivière
<vincent.riviere@freesbee.fr>:
> m0n0 wrote:
>> But I'm afraid about this: Is gcc smart enough to really increase the
>> alignment??? 
> 
> We will be able to answer that question when we are able to reproduce 
> the problem. A simple and self-contained testcase would be the best.

This is my testcase:
#include <stdio.h>
#include <math.h>
#include <stdint.h>

struct nsfb_s {
    int width; /**< Visible width. */
    int height; /**< Visible height. */
    int bpp; /**< Bits per pixel. */
    int refresh; /**< Desired refresh rate for physical displays. */
    char *output_dev; /**> Path to output device for frontends that
require it. */
    uint8_t *ptr; /**< Base of video memory. */
    int linelen; /**< length of a video line. */
    uint32_t palette[256]; /**< palette for index modes */
    void *cursor; /**< cursor */
    void *frontend_priv; /**< frontend opaque data. */
};
typedef struct nsfb_s nsfb_t;

static inline uint32_t *
get_xy_loc(nsfb_t *nsfb, int x, int y)
{
        return (uint32_t *)(nsfb->ptr + (y * nsfb->linelen) + (x << 2));
}

int main()
{
	nsfb_t foo;
	get_xy_loc( &foo, 10,10);
	return( 0 );
}

Compile: 

m68k-atari-mint-gcc -c testm.c -Wall -Wcast-align