Oh, I see. So I infer that it would be (would have been?) possible to design QZRUCLSP to properly handle optionally-passed parameters by careful placement of those parms presented to the procedure. But it would likely not be possible to influence a program without such design in such a way that the stars line up for that call.

Finally the documentation line makes sense: "The API does not support calling procedures that have been defined using #pragma artopt"

So no defect at all. Thanks everyone. This is what I had missed.

"Barbara Morris" <bmorris@xxxxxxxxxx> wrote:

On 3/18/2011 9:38 AM, Dennis wrote:
Ah, that sheds some light! Since we have no (apparent) means of
telling QZRUCLSP that certain parameters are optional but passed, it
seems unlikely that it would be capable of guessing the correct means
of passing same.

Probably a moot point, but is the "differently" part of your message
a trade/business/compiler secret?

It's more that I don't know all the details since it's mostly
transparent to the compilers. The compilers just tell the optimizating

translator that the called function has optional parameters.

I do know that for a "..." C function, the function would use the
va_list mechanism to access optional parameters. This requires that
optional parameters be contiguous in storage, so parameter 3 follows
parameter 2 in storage, at a fixed offset away. When there are no
optional parameters, the system can pass the parameters in whatever way

makes the most sense. So the location of parameter 3 can't be
from the location of parameter 2.
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