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From: "anlauf at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/56615] New: [4.4/4.5/4.6/4.7 Regression] Wrong code for passing arrays of character
Date: Thu, 14 Mar 2013 12:10:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D56615

             Bug #: 56615
           Summary: [4.4/4.5/4.6/4.7 Regression] Wrong code for passing
                    arrays of character
    Classification: Unclassified
           Product: gcc
           Version: 4.7.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: anlauf@gmx.de


Hi,

the code bwloe works with gfortran 4.1.2 and 4.3.4,
but fails at least with 4.4.0, 4.5 and 4.7.

Correct output:
 # Forward:
 a=3Dabcdefgh
 s=3Dabcdefgh
 c=3Dabcdefgh      ok
   stride =3D +2:
 u=3Daceg
 c=3Daceg      ok

 # Backward:
 b=3Dhgfedcba
 t=3Dhgfedcba
 c=3Dhgfedcba      ok
   stride =3D -1:
 c=3Dhgfedcba      ok

Wrong output:
 # Forward:
 a=3Dabcdefgh
 s=3Dabcdefgh
 c=3Dabcdefgh      ok
   stride =3D +2:
 u=3Daceg
 c=3Dabcd    BUG!

 # Backward:
 b=3Dhgfedcba
 t=3Dhgfedcba
 c=3Dhgfedcba      ok
   stride =3D -1:
 c=3Dh=C3=BF=C3=BF=C3=BF=C3=BF    BUG!

-------------------------------------------

program gfcbug
  implicit none
  integer, parameter             :: n =3D 8
  integer                        :: i
  character(len=3D1), dimension(n) :: a, b
  character(len=3Dn)               :: s, t
  character(len=3Dn/2)             :: u

  do i =3D 1, n
     a(i) =3D achar (i-1 + iachar("a"))
  end do
  print *, "# Forward:"
  print *, "a=3D", a
  s =3D transfer (a, s)
  print *, "s=3D", s
  call cmp (a, s)
  print *, "  stride =3D +2:"
  do i =3D 1, n/2
     u(i:i) =3D a(2*i-1)
  end do
  print *, "u=3D", u
  call cmp (a(1:n:2), u)
  print *
  print *, "# Backward:"
  b =3D a(n:1:-1)
  print *, "b=3D", b
  t =3D transfer (b, t)
  print *, "t=3D", t
  call cmp (b, t)
  print *, "  stride =3D -1:"
  call cmp (a(n:1:-1), t)
contains
  subroutine cmp (b, s)
    character(len=3D1), dimension(:), intent(in) :: b
    character(len=3D*),               intent(in) :: s
    character(len=3Dsize(b))                     :: c
    c =3D transfer (b, c)
    print *, "c=3D", c, "    ", merge ("  ok","BUG!", c =3D=3D s)
  end subroutine cmp
end program gfcbug