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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/98408] New: Character lengths for allocatable character
 arrays
Date: Mon, 21 Dec 2020 08:35:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98408

            Bug ID: 98408
           Summary: Character lengths for allocatable character arrays
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tkoenig at gcc dot gnu.org
  Target Milestone: ---

Consider

program main
  character (len=3D:), allocatable :: a(:)
  allocate (character(len=3D10) :: a(5))
end program main

This yields (in the tree dump)

  D.3941 =3D (bitsizetype) (sizetype) NON_LVALUE_EXPR <.a> * 8;
  D.3942 =3D (sizetype) NON_LVALUE_EXPR <.a>;
  a.data =3D 0B;
  {
    integer(kind=3D4) overflow.0;
    logical(kind=3D4) not_prev_allocated.1;

    .a =3D 10;

And later, if you use

size_in_bytes (gfc_get_element_type (TREE_TYPE(se->expr)))

you get an undefined variable.

Strange...=