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From: Bill Tutt <billtut AT microsoft DOT com>
To: "'DJ Delorie'" <dj AT delorie DOT com>, steve AT khoral DOT com
Cc: cygwin AT sourceware DOT cygnus DOT com
Subject: RE: DLL creation problem
Date: Thu, 28 Oct 1999 19:56:02 -0700
X-Mailer: Internet Mail Service (5.5.2650.21)



> From: DJ Delorie [mailto:dj AT delorie DOT com]
> > 	So how do I make the above assignment (or any global variable
> > 	assignemnt) work as expected?
> 
> What we do is, in the header where you prototype the variable
> (i.e. the "extern int foo;" line), add a directive like this:
> 
> 	extern int foo __declspec(dllimport);
> 
> Note that you should *only* do this for the application; don't do it
> for the dll itself.
> 

Whats typically done is something like this:
#ifdef BUILD_XYZ
#define XYZAPI __declspec(dllexport)
#else
#define XYZAPI __declspec(dllimport)
#endif

and just write a header file like so:

XYZ.h might contain:

extern int foo XYZAPI;

Then when you're building the DLL, just define BUILD_XYZ.

Bill

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