Re: be used uninitialized in this function

On 15 jan, 15:44, Jinsong Zhao <jsz...@xxxxxxxx> wrote:
Hi there,

With the example code below, gfortran (4.5.0) give a strange warning
message with -O2 flag:

 > gfortran -Wall -O2 -c readmo.f90
readmo.f90: In function 'readmo':
readmo.f90:4:0: warning: 'convrt' may be used uninitialized in this function

When with -O0, the warning message disappear.

In fact, the array lopt is not initialized in the code, however, the
compiler does not give warning about that.

Any suggestions or comments? Thanks in advance!

Regards,
Jinsong

subroutine readmo()
!!!! example code readmo.f90 !!!!

    implicit none
    real :: convrt
    integer :: i, iflag, j
    integer, dimension(3,5) :: lopt

    iflag = 0
    do i = 1, 5
       do j = 1, 3
          if ( lopt(j,i) < 0 ) then
             convrt = 1.0
             if ( j > 1 ) convrt = 2.0
             iflag = 1
          endif
       enddo
    enddo
    if ( iflag /= 0 ) then
       do i = 1, 5
          write(6,*) i*convrt
       enddo
    endif

end subroutine readmo

For me, lopt seems to be seen as a function returning an integer of
dimension (3,5).
In that case lopt must be missing at link time.

.

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