Odd bug from Stack Overflow

[Steve Kargl]

On Sun, Mar 18, 2018 at 06:12:23PM +0100, Thomas König wrote:
> Hi Steve,
> 
> This looks like a missing conversion somewhere,
> because this works:
> 
> program test
>     implicit none
>     integer, parameter :: n = 65536
>     real, dimension(n) :: y
>     integer :: i
>     y = (/ (1.0, i=1, n) /)
>     print *,y(2)
>     if (y(2) /= 1) stop 1
> end program test
> 
> Also, n=65536 is a limit... setting n=2**16-1 actually
> works as expected with the orginal test case.

Yes, n=2**16-1 works because gfortran switches over from
expanding the array constructor into a static temporary
variable to scalarizing the implied-do-loop at 2**16.  It
is a trade-off we made a long time ago for

integer, parameter :: i(somebignumber) = [(i,i=1,somebignumer)]

See -fmax-array-constructor= option.

> This looks like a resolution problem, not something
> in the scalarizer. Can you open a PR?

Yes.

-- 
Steve