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Date: Mon, 10 Jun 2002 11:13:34 +0000
From: Ignasi Villagrasa <gri AT netcom DOT es>
Organization: gri
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To: cygwin AT cygwin DOT com
Subject: global instances in dll's
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Hi everyone,

I'm trying to migrate an application from Watcom compiler to Cywin.

Two parts compose the application:

    - An executable one, using a main function to run the program.
    -  A dll. It receives petitions from the executable.

This pair has been compiled and linked under Windows NT and W2000 using 
Watcom compiler without problems. But when I try to build the 
application under Cygwin, a problem arises.

Basically, the problem is caused by several inherited global class 
instances, duplicated in executable and .dll programs.
For instance:

        E (executable) calls B. B is a module that defines global 
instance C.
        D (dll) calls B. B defines global instance C  also.

In Watcom this instances become different in the executable and in the 
dll, but in cygwin I notice the instance is the same that I have in the 
executable file. This causes working problems, related to reentered 
destructors and not desired inherited information.
Obviously, the desired situation would be to avoid global instances in 
order to completely encapsulate the program operation, but this requires 
too much study and time by now. The related software piece is an 
inherited one difficult to isolate. So at first I'd like to adapt the 
Cygwin program funcionality to the Watcom program one, and, after that , 
progress in module isolation.

Is it possible, using any linker option, or modifier, to get the .dll 
working with global variables different instances that those in .exe ?

Could anyone help me ?

Thanks in advance. Ignasi Villagrasa.


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