creating dso's

From: Eric (nospam_at_email.com)
Date: 11/23/05 

Date: Tue, 22 Nov 2005 16:16:46 -0800

system: debian based for x86
I'm trying to create an executable that uses dso's. It compiles and link's
ok but in the dso I need to refer to a global var in the main executable:
volatile int volvar;
all sources are .cpp files so i'm using g++

I can load the module and reference it if there is no reference to the
global variable. If i try to load the module using dlopen and the module
references the global volvar i get an error "undefined symbol volvar"
error from dlopen when i run the program.
I thought the -rdynamic flag would solve it but it doesnt.
I also tried wrapping the declartion in extern "C"
ie:
extern "C" volatile int volvar; // in main program
extern "C" volatile int volvar; // in dso

 Can anyone show me a proper make file to compile the main and dso
so the dso can reference global variables and fns?
Thanks
Eric

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