Linker and -Bsymbolic option

Yesterday I learn a strange thing of UNIX so.

Assuming you build a so from a C file like this:

#include <stdio.h>
#include <stdlib.h>

int foo()
{
        printf("foo inside so1\n");
}

int test1()
{
        foo();
}

another like this

#include <stdio.h>
#include <stdlib.h>

int foo()
{
        printf("foo inside so2\n");
}

int test2()
{
        foo();
}

And an executable

#include <stdio.h>
#include <stdlib.h>

int main()
{
        test1();
        test2();
        return 0;
}

You will expect a result like:

  foo inside so1
  foo inside so2

but depending on so loading you can get

  foo inside so1
  foo inside so1

or

  foo inside so2
  foo inside so2

This because linker resolve functions at execution time even for
function in the same module !!! (the only exception is static
functions...)
I don't like this behavior so I searched an option to disable this. I
found -Bsymbolic linker option so I added a -Wl,-Bsymbolic to LDFLAGS
however I don't know if this option if portable or not...

Is -Bsymbolic a portable option or work only on GNU linker ?

freddy77