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From: "kloedej at knmi dot nl" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/53685] surprising warns about transfer with explicit character range
Date: Thu, 29 Nov 2012 10:52:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53685

Jos de Kloe <kloedej at knmi dot nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kloedej at knmi dot nl

--- Comment #7 from Jos de Kloe <kloedej at knmi dot nl> 2012-11-29 10:52:32 UTC ---
I see a very similar problem with a slightly modified piece of testcode on
version 4.7.2. Not sure if it is exactly the same, but probably related to the
already patched issue. My testcode:

program testtransfer

  integer, parameter :: r8_ = Selected_Real_Kind(15,307)  ! = real*8
  integer, parameter :: nbytes_r8_ = 8
  real(r8_) :: val
  character(len=1), dimension(16) :: byte_array

  byte_array(:) = ' '
  call mytest(byte_array,val)
  print *,"val: ",val
contains
  subroutine mytest(byte_array,val)
    character(len=1), dimension(16), intent(in) :: byte_array
    real(r8_),intent(out) :: val
    val = transfer(byte_array(1:nbytes_r8_),val)    
  end subroutine mytest
end program testtransfer

Results:

>gfortran -Wall  -o transfer_problem transfer_problem.F90
transfer_problem.F90:15.19:

    val = transfer(byte_array(1:nbytes_r8_),val)    
                   1
Warning: Intrinsic TRANSFER at (1) has partly undefined result: source size 1 <
result size 8
>

This occurs for this version:
>gfortran --version | head -1
GNU Fortran (GCC) 4.7.2 20120921 (Red Hat 4.7.2-2)
on my Fedora17 system. (package gcc-gfortran-4.7.2-2.fc17.x86_64)

The problem is not present in:
>gfortran --version | head -1
GNU Fortran (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2)
on a Fedora16 system. (package gcc-gfortran-4.6.3-2.fc16.x86_64)