> On Mon, 22 Jul 2002, Jay Monkman wrote:
> 
> > How can this work? What if someone wants to compile an application
> > something like the following:
> >         typedef struct {
> >              char c  __attribute__ ((packed));
> >              long l  __attribute__ ((packed));
> >         } foo_t;
> >
> >
> >         void func1(void);
> >         void func2(long *p);
> >
> >         void func1(void)
> >         {
> >              foo_t foo;
> >
> >              foo.c = 'a';
> >              foo.l = 0x12345678;
> >
> >              func2(&foo.l);
> 
> I think GCC should issue a warning here.  You're implicitly converting
> from one pointer type to another with stricter alignment constraints
> (actually not stricter so much as utterly incompatible here), which is
> often a mistake.

Indeed.  Unfortunately GCC does not have a "packed long" type outside of a 
structure, so it is practically impossible to write code like that above 
and get it to work.

R.