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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 the
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 predicted
from the location of parameter 2.
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