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From: "townsend at astro dot wisc.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/105205] New: Incorrect assignment of derived type with
 allocatable, deferred-length character component
Date: Sat, 09 Apr 2022 19:21:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105205

            Bug ID: 105205
           Summary: Incorrect assignment of derived type with allocatable,
                    deferred-length character component
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: townsend at astro dot wisc.edu
  Target Milestone: ---

I've run into problems with assignment of derived types containing an
allocatable array of deferred-length strings. Example program:

---
program alloc_char_type
   implicit none
   type mytype
      character(:), allocatable :: c(:)
   end type mytype
   type(mytype) :: a
   type(mytype) :: b
   integer :: i
   a%c =3D ['foo','bar','biz','buz']
   b =3D a
   do i =3D 1, size(b%c)
      print *,b%c(i)
   end do
end
---

Running with gfortran 10.2.0 or 11.2.0, I get the output:

>>
 foo



<<

If I hard-code the length of the c component (to, say, 3), I get the expect=
ed
output:

>>
 foo
 bar
 biz
 buz
<<

It seems as if only the first element of c is being copied correctly.

cheers,

Rich=