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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/102003] New: [PDT] Length of character component not
 simplified
Date: Fri, 20 Aug 2021 19:11:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102003

            Bug ID: 102003
           Summary: [PDT] Length of character component not simplified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anlauf at gcc dot gnu.org
  Target Milestone: ---

We should be able to simplify at compile time the following code:

  type pdt(n)
     integer, len     :: n =3D 8
     character(len=3Dn) :: c
  end type pdt
  type(pdt(42)) :: p
  integer, parameter :: m =3D len (p% c)  ! rejected
  print *, len (p% c) =3D=3D 42             ! works, but not simplified
end

Instead we currently get:

foo.f90:6:27:

    6 |   integer, parameter :: m =3D len (p% c)  ! rejected
      |                           1
Error: Cannot convert UNKNOWN to INTEGER(4) at (1)

(The code is accepted by Intel.)=