#define question

Fri Aug 1 08:31:00 GMT 2003

Having just updated to cygwin 1.3.22-1 I'm now building my application 
and have a wierdness I hope someone can help with.
Deep in the nether regions of the code, I use IMalloc_Free which is a 
macro now defined in objidl.h. I think in earlier versions of cygwin it 
was somewhere else. In objidl.h, it's protected by an ifdef, so it 
looks like this:
#ifdef COBJMACROS
/
some stuff
/
#define IMalloc_Free(This, pv) (This)->lpVtbl->Free(This,pv)
In my code, I have this:
#define COBJMACROS
#include <objidl.h>
Compiling, I get no errors until the link phase, at which point it 
complains that IMalloc_Free is undefined and points me at the lines in 
my code where I actually use the macro. ie, either objidl.h isn't 
getting included at all, though I get no error there, or the macro isn't 
getting #defined, or it's getting undefined somewhere. I've looked 
really hard for daft spelling errors and all that, without success.
Compiling with -E seems to show that it's just not getting done, though 
I fess I find the preprocessor output confusing, so I may be wrong on 
that one. However, it _looks_ as though it's just not getting done by 
objidl.h, but that doesn't make sense either.
My temporary fix is to manually #define the macro immediately before I 
use it, but that's not really satisfactory, of course.
Anyone got any idea what's going on here?
Thanks
Rob
-- 
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Just self-replicating, compartmentalised, redox chemistry, really.
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Rob Clack Acedb Development, Informatics Group
 email: rnc@sanger.ac.uk Wellcome Trust Sanger Institute
 Tel: +44 1223 494780 Wellcome Trust Genome Campus
 Fax: +44 1223 494919 Hinxton Cambridge CB10 1SA
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