Getting multiple definition error from qatomic_x86_64.h

[markcole]

I am not sure if this is a QT or C++ related issue.

I have a commonvars.h file that I am using for shared memory location mapping.

I have the include statement in the main.cpp file that starts the QT app as well as one of my window .cpp files that I want to access the shared memory portions.

However I get a qatomic_x86_64.h:65 multiple definition of xxxxx error for each of the variables in the commonvars.h file.

//commonvars.h
#ifndef COMMONVARS_H
#define COMMONVARS_H
 
blah, balh
 
#endif

//commonvars.h
#ifndef COMMONVARS_H
#define COMMONVARS_H

blah, balh

#endif

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Any help?

thanks....

[jacek]

If you want to use global variables, you have to declare them only once in a .cpp file and use the extern keyword in header file.