Sean Chittenden <sean@chittenden.org> writes:
> Um, I said it would change the ABI and I said as much in my previous
> post.
The ABI is only the smaller part of the problem; you'd be forcing people
to change their source code, in a rather nonobvious way.
> it is code compatible provided people aren't using any %
> escape strings in their error messages (if there aren't any format
> strings, there won't be any need to modify the program),
And if there aren't any format strings, then we don't need to change the
interface. I don't see your point at all. You cannot make use of the
added functionality without breaking client applications.
I could envision a helper procedure, known only within libpq, that has
a signature like formatNotice(PGconn* conn, const char *fmtstring, ...)
and encapsulates the work needed to handle a format string. But I see
no reason to push that work out to client applications.
regards, tom lane