Re: g++ and Static Variables

[Larry I Smith]

fewgoodmen@gmail.com wrote:
> I am currently working on changing the compiler from Sun Workshop to
> g++ for a mid sized C program.  In the C files we have static variables
> defined and declared.  This works fine with the Sun Workshop compiler.
> However under g++ the static variables  are initialized to zero but do
> not have the value they are assigned to.  For example say file2.cc I
> have static variable defined and declared as
>       static int j = 5;
> Variable j seems to have a value of zero and not 5.  However any static
> variables defined and declared in the file that contains function main
> seems to have the value that is assigned to them.  I am using g++
> version 3.2.2 in a Solaris 8 environment.
> Any help would be appreciated.
> 
> Joe
> 

Assuming your program is really C++, here's a trivial example
comprised of 2 files, xx.cc and xx1.cc:

------- xx1.cc ------
// 'ej' can be globally visible if
// declared as 'extern int ej' in other
// source files or headers.
int ej = 8;


------- xx.cc -------
#include <iostream>

// because of the 'static' keyword, 'j' is visible
// only within THIS source file.  this applies to both
// 'C' and 'C++'
static int j = 5;

// declare that 'ej' resides in another file.
// this statement could also be in a header file
// that is included by all source files needing
// access to 'ej'
extern int ej;

int main()
{
    std::cout << " j is: " << j << std::endl;
    std::cout << "ej is: " << ej << std::endl;

    return 0;
}


compile the above 2 files with:

  g++ -o xx xx.cc xx1.cc

execute the compiled example with:

  ./xx

Regards,
Larry

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