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From: bjb@pyramid.com (Bruce Beare)
Newsgroups: comp.sys.mac.programmer
Subject: Linking Problem with ThinkC
Message-ID: <158533@pyramid.pyramid.com>
Date: 7 Jun 91 16:59:38 GMT
Sender: news@pyramid.pyramid.com
Distribution: na
Organization: Pyramid Technology
Lines: 33

I just noticed the following behaviour with ThinkC....


file1....
---------
#include "structures.h"
Defaults gdefaults = {1,2,3};


file2....
----------
#include "structures.h"
Defaults *gdefaults;

void whatever(void)
{
  somewhere = gdefaults->anything;
}

___________________________________________

I was tracking down an elusive bug where 'somewhere' wouldn't get 
properly initialized. When I put a breakpoint at the assignment
line and then used the data window to look at gdefaults, the
data window told me that gdefaults was a zero-valued pointer (a
dead giveaway).

Sure -- this IS a typical stupid programming bug, but I would have
expected the linker to give me some warning. 


-Bruce
bjb@pyramid.com