Pb of Fortran <-> C++ interoperability if I compile the fortran with the option -finit-local-zero

I've found out a strange result while linking a program with C++ and Fortran. The test (see after) is very simple : define a variable in a fortran module and access it in the C++ program. If I compile the fortran (gfortran from GCC 7.4.0) with the option "-finit-local-zero" then the link fails complaining about a multiple definition of the variables. Of course, if I suppress this option, it works well but it's a pb for me cause I need to set to "0" my uninitialized data.

I put here after the fortran code, the C++ code and the commands for making the exe.

        module A_module

        USE ISO_C_BINDING
        implicit none
        real(C_FLOAT) , bind(C) :: isareal
        integer(C_INT), bind(C, NAME="MMS") :: MMS 

        CONTAINS

        subroutine CHANGE() bind(c)
        use iso_c_binding
        implicit none
        isareal = 5.0 
        MMS=40
        write(*,*) 'fortran changes isareal =>',isareal
        write(*,*) 'fortran changes MMS =>',MMS
        end subroutine CHANGE
        end module

#include <iostream>

using namespace std;

//Fortran definitions "translated" to C++
extern "C" {
void change();
float isareal;
int MMS; // IMPORTANT TO WRITE "mms" and NOT "MMS"
}
int main() {
    // Can access to a variable in a fortran module ? 
    cout << "In C before: isareal = " << isareal;
    cout << " and MMS = " << MMS << "\n";

    change(); //call fortran to change the values 

    // Control
    cout << "In C after: isareal = " << isareal;
    cout << " and MMS = " << MMS << "\n";

    return 0;
}

And the commands:

 mpif90  -finit-local-zero -c mod_A_module.f
 mpicxx -Wextra -std=c++11 -c cpp_main_1.cpp
 mpif90 *.o -std=c++11 -lstdc++ -o bad.exe
./bad.exe

here is the error (when using -finit-local-zero)

mod_A_module.o:(.bss+0x0): multiple definition of `isareal'
cpp_main_1.o:(.bss+0x0): first defined here
mod_A_module.o:(.bss+0x4): multiple definition of `MMS'
cpp_main_1.o:(.bss+0x4): first defined here

Thank you in advance for your help...