struct-ret-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* { dg-do run { target hppa*-*-* } } */
/* { dg-options { -O2 } { target hppa*-*-* } } */
extern void exit (int);
typedef struct {
        int             x;
        int             y;
}               point_t;

int main(int argc, char *argv[]);
int printPoints(point_t a, point_t b);
point_t toPoint(int x1, int y1);

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

        if (printPoints(toPoint(0, 0), toPoint(1000, 1000)) != 1)
                abort();
        else
                exit(0);

        return 0;
}

int
printPoints(point_t a, point_t b)
{
        if (a.x != 0
            || a.y != 0
            || b.x != 1000
            || b.y != 1000)
                return 0;
        else
                return 1;
}

point_t
toPoint(int x1, int y1)
{
        point_t         p;

        p.x = x1;
        p.y = y1;

        return p;
}