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From: "pault at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/59104] Wrong result with SIZE specification expression
Date: Wed, 22 May 2024 07:46:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D59104

Paul Thomas <pault at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pault at gcc dot gnu.org

--- Comment #4 from Paul Thomas <pault at gcc dot gnu.org> ---
The problem lies in gfc_conv_expr_descriptor, as the following demonstrates:
module m1
   implicit none
   integer, parameter :: dp =3D kind([double precision::])
   contains
      function f(x)
         integer, intent(in) :: x
         real(dp) f(x/2)
         integer y(size(f)+1)

         write(*,*) 'size(f) =3D ',size(f)
         write(*,*) 'size(y) =3D ',my_size(y)
         f =3D 0
      end function f
      integer function my_size (arg)
        integer :: arg(:)
        my_size =3D size(arg)
      end
end module m1

program bug3
   use m1
   implicit none
   real y

   y =3D sum(f(2))
end program bug3

In both this and the original testcase, the result depends ultimately on a
'ubound.x' that has not been set.

I am not sure that I understand why explicit shape arrays are being handled
this way in size, when all the information needed is present in the array_s=
pec.
However, the passing of an incorrect descriptor to 'my_size' has to be fixe=
d.

Cheers

Paul=