> What is a "type punned pointer", and are we doing anything dangerous with > them?
struct grill x; ((struct foo)x).bar = 5; or struct grill *x; ((struct foo *)x)->bar = 5; Changing the type of an object on the left side of an assignment has become a violation of strict aliasing rules, and newer GCCs use aliasing during optimization. Thus, gcc may not properly realize that a value has been overwritten by such an assignment, and use an old value instead of the (correct) new value. What you're supposed to do is use "void *" as your intermediate value, not a pointer to some specific type. > Is there a portable way to printf a size_t? Cast it to a long and use %ld is portable enough for us. _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
