What OS and compiler is this?
Do you specifcally do anything with the variables
other than decalre them? There are some high
end compilers I believe that will omit varialbes if they
are not used anywhere in the code. (i think Sun's C
compiler can do this)
Try doing something simple with the varialbes like assigning
them some value in the function.
WC
-----Original Message-----
From: Sammy <samedi@DHC.NET>
To: CIRCLE@post.queensu.ca <CIRCLE@post.queensu.ca>
Date: Thursday, May 14, 1998 12:31 PM
Subject: Stupid Compiler Tricks
>I've had the strangest thing happen to me while troubleshooting code
>recently. I worked around it the first time, but tis is something that
>definitely needs fixing.
>
>What is happening is that I'm adding variables and code to an existing
>function (mobile_activity) which when compiled are completely ignored.
>Dong an "info locals" in gdb doesn't show my variables, and if I try to
>print them, I'm told there aren't any variables of that name in this
>context. Strangely, the code shows up as expected when I "list" it, and
>if I pass the variables to functions, they're passed as 0.
>
>Here's a specific example. I'm adding a dragon breath feature where I
>need to check each mob for it's dragon type, which I then pass to the
>dragon_breath() function if the mob is a dragon and fighting. I'm using
>mob
>flags to set dragon type so I don't have to do anything with the mob
>files.
>
>In mobile_activity(), I added int dragon_type. A little ways down,
>dragon_type is found by doing some bit shifting (I'm using 5 mob flag bits
>to allow for 31 dragon types). If the dragon type is valid and the mob is
>fighting, I call dragon_breath(ch, dragon_type).
>
>Now, when this code runs, it acts as if dragon_type is always 0. I've
>doublechecked my math to make sure it's correct. GDB tells me dragon_type
>doesn't exist in mobile_activity.
>
>Any ideas about what's going on here?
>
>Sam
>
>
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