[flang] Does not support dtime call

[arrowd]

The following program fails to link with an undefined symbol, but works with gfortran:

program test_dtime
    integer(8) :: i, j
    real, dimension(2) :: tarray
    real :: result
    call dtime(tarray, result)
    print *, result
    print *, tarray(1)
    print *, tarray(2)   
    do i=1,100000000    ! Just a delay
        j = i * i - i
    end do
    call dtime(tarray, result)
    print *, result
    print *, tarray(1)
    print *, tarray(2)
end program test_dtime

It seems to be a GNU extensions, so I'm not sure if Flang should actually support this.

[eugeneepshteyn]

It is indeed a GNU extension: https://gcc.gnu.org/onlinedocs/gfortran/DTIME.html

[eugeneepshteyn]

I don't know, if flang should support it. FWIW, Intel compiler supports it: https://www.intel.com/content/www/us/en/docs/fortran-compiler/developer-guide-reference/2025-2/dtime.html