'The \'-qversion\' is the standard option fo XL compilers.
Output looks like this::
IBM XL C/C++ for Linux, V11.1 (5724-X14)
Version: 11.01.0000.0000
or::
IBM XL Fortran for Linux, V13.1 (5724-X16)
Version: 13.01.0000.0000
or::
IBM XL C/C++ for AIX, V11.1 (5724-X13)
Version: 11.01.0000.0009
or::
IBM XL C/C++ Advanced Edition for Blue Gene/P, V9.0
Version: 09.00.0000.0017'

@classmethod
def default_version(self, comp):

    return get_compiler_version(comp, '-qversion', '([0-9]?[0-9]\\.[0-9])')
