objc_trace

[Gary Polhill]

This is probably a question better directed elsewhere, but anyway ...

In objc-api.h, there is a rather nice looking variable called objc_trace:

/*
** Set this variable nonzero to print a line describing each
** message that is sent.  (this is currently disabled)
*/
extern BOOL objc_trace;

I tried setting objc_trace = YES in main.m of one of my Swarm simulations,
(with a #import <objc/objc-api.h>) and when it came to link time, I got the
rather disappointing error message:

Undefined                       first referenced
 symbol                             in file
objc_trace                          main.o

The gcc command did have a -lobjc in it -- though I did an nm of libobjc.a
and didn't find objc_trace. I'm wondering if anyone out there knows
anything about this -- like whether the "currently disabled" means "not
available at all" instead of "currently set to NO", as I had hoped.

Gary


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