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From: "mailling-lists-bd at posteo dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/111304] New: Problem when passing implicit arrays of
 characters to functions
Date: Wed, 06 Sep 2023 11:14:41 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 13.2.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111304

            Bug ID: 111304
           Summary: Problem when passing implicit arrays of characters to
                    functions
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mailling-lists-bd at posteo dot de
  Target Milestone: ---

Hi,

In the following code, the first call to `func1` works as expected and prin=
ts
the content of the array `my_directory`, while the second call, with the ar=
ray
defined directly in the function argument, leads to SIGABRT and prints=20
```
 ARRAY =3D my_directory/file1my_directory/file2my_directory/dum1
my_directory/dum2
corrupted size vs. prev_size
```

I have tested with gfortran 13.2.1 (gfortran -o test program.f90), on Fedora
38. It should also be noticed that both function calls run fine if we remove
the `trim(prefix)//` from each character string.


```
program test
  implicit none

  character(len=3D256) :: test_array(4)
  character(len=3D:), allocatable :: prefix
  integer :: res

  prefix =3D 'my_directory'
  test_array =3D [ character(len=3D256) :: &
       & trim(prefix)//'/file1', &
       & trim(prefix)//'/file2', &
       & trim(prefix)//'/dum1', &
       & trim(prefix)//'/dum2' &
       & ]

  print *, 'Test with "res =3D func1(test_array)"'
  res =3D func1(test_array)

  print *, 'Test with "res =3D func1([ character(len=3D) :: ...] )"'
  res =3D func1([ character(len=3D256) :: &
       & trim(prefix)//'/file1', &
       & trim(prefix)//'/file2', &
       & trim(prefix)//'/dum1', &
       & trim(prefix)//'/dum2' &
       & ])


contains

  function func1(array) result(res)
    character(len=3D*), intent(in) :: array(:)

    integer :: res

    print *, 'ARRAY =3D ', array
    res =3D 0
  end function func1
end program test
```=