2.0
Testing if the conditional compilation is supported or not.
Yi Wen at 05032004: Do we want to write two versions of has_omp? both C23456789
and #ifdef formats are supposed to work. At least Sun's compiler cannot deal with
the second format (#ifdef)
INTEGER FUNCTION has_openmp()
= 0
!version 1.
!C23456789
!$ = 1
! version 2.
!#ifdef _OPENMP
= 1
!#endif
END FUNCTION