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From: "longb at cray dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/97272] New: Wrong answer from MAXLOC with character arg
Date: Fri, 02 Oct 2020 14:03:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97272

            Bug ID: 97272
           Summary: Wrong answer from MAXLOC with character arg
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: longb at cray dot com
  Target Milestone: ---

Test case:

> cat test.f90
      program test
      character, allocatable :: a(:)
      integer(8) l, i
      l =3D 2000000_8
      allocate (a(l))
      do i =3D 1, l
      a(i) =3D 'a'
      end do
      l =3D l - 1
      a(l) =3D 'b'
      i =3D maxloc (a, dim=3D1, kind=3D8)
      print *, 'i =3D ', i, 'a(i) =3D ', a(i)
      end

Expected behavior (Cray):

> ftn test.f90
> ./a.out
 i =3D  1999999 a(i) =3D b

Incorrect result (gfortran):

> module swap PrgEnv-cray PrgEnv-gnu
> gfortran test.f90
> ./a.out
 i =3D               2000000 a(i) =3D a
> gfortran --version
GNU Fortran (GCC) 10.1.0 20200507 (Cray Inc.)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.=