On Sat, Jul 07, 2007 at 11:32:50PM -0400, Pavel Roskin wrote:
> It looks like the definition of struct st is sort of "weak" when it's
> read from the header included on the command line, so that the forward
> declaration from test.c removes the original definition.
>
> It's also possible to define struct st to something else, and sparse
> won't warn about it. But omitting "struct st;" fixes the error, so the
> original definition is known to sparse.
Looks like it gets a scope boundary between those. There is one case
when presense of struct st; changes things: struct st; in
struct st {....};
....
{
struct st;
struct st *p;
...
struct st {....} x;
...
}
will make p a pointer to struct st from that scope. If you omit it,
p will be a pointer to struct st from the outer scope and x will have
a different type. Too late beginning of file scope, perhaps?
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