hi All,

I just encountered the following problem

I've a function "detect_US", which should return true when a valid
US-echo is detected

In the main program I call the function like this
<JAL>
if detect_US then
asynch_send_hw (US_distance)
end if
</JAL>

This worked perfect, at least I thought ;-)

For test purposes, I removed "asynch_send_hw" call
and the result was that about my whole program was optimized away :-(

Strictly speaking, this optimization was a correct action,
because I forgot to set a return value in the function "detect_US".
(The US-distance was also transmitted in another place,
therfor I thought the program worked correctly).
And main problem is that the function detect_US was never called !!

So I think at least it's inconsequent to optimize away or not
the function detect_US,
depending on if the "if-statement" contains any functional code.

It would also be a good idea to give a warning when no return value is
set in a function.

Stef