On Wed, Oct 12, 2005 at 06:28:24PM -0500, Jeremy Nelson wrote:
>
> Therefore, I propose making it official policy that epic is not compatable
> with gcc -O2 because -O2 only works properly on code that conforms to C99's
> rules about alias safety: epic is a c90 program and does not conform.
You could also use -fno-strict-aliasing to work around this.
> struct s1 { int x,y; };
> struct s2 { int x,y; float f };
> int func (struct s2 *ptr) { ptr->x = 5; }
> int main (void)
> {
> struct s1 *ptr;
> struct s2 var;
>
> var.x = 1;
> ptr = (struct s1 *)&var;
> func(ptr);
> printf("%d\n", var.x);
> }
There are several things wrong with this example, the most
important is that func() takes a struct s2 * and you pass it a
struct s1 *.
Kurt
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