r"""
        Cross platform specific subfolder.

        Parameters
        ----------
        forcex86: bool
            Use 'x86' as current architecture even if current acritecture is
            not x86.

        Return
        ------
        subfolder: str
            '' if target architecture is current architecture,
            '\current_target' if not.

def cross_dir(self, forcex86=False):
        r"""
        Cross platform specific subfolder.

        Parameters
        ----------
        forcex86: bool
            Use 'x86' as current architecture even if current acritecture is
            not x86.

        Return
        ------
        subfolder: str
            '' if target architecture is current architecture,
            '\current_target' if not.
        """
        current = 'x86' if forcex86 else self.current_cpu
        return (
            '' if self.target_cpu == current else
            self.target_dir().replace('\\', '\\%s_' % current)
        )