Gfortran bug?

[TYTECA Sophie]

Hello,

I try to read big_endian files with gfortran (see below the version I use)

The three different methods don't work:
-fconvert=big-endian in the command line
export GFORTRAN_CONVERT_UNIT='big_endian;native:11'  
convert='big_endian' in the open statement

for example ,in the file ess_bin.f90

      program ess
      real*4 xlon(6232)
      open(11,file='lont42r_b',form='unformatted')
      read(11)xlon
      print*,'xlon'
      print 1000,(xlon(i),i=1,10)
      open(12,file='lont42r',convert='big_endian',form='unformatted')
      read(12)xlon
      print*,'xlon big'
      print 1000,(xlon(i),i=1,10)
1000  format((10f8.2))      
      stop
      end

=> gfortran ess_bin.f90
=> a.out
 xlon
   18.00   36.00   54.00   72.00   90.00  108.00  126.00  144.00  
162.00  180.00
At line 8 of file ess_bin.f90
Fortran runtime error: Invalid argument

  I try to read a longitude file :

-rw-r--r--  1 tyteca udc  24936 déc  1  2005 lont42r     :  it is the 
big_endian file
-rw-r--r--  1 tyteca udc  24936 oct 16 09:53 lont42r_b  : it is  the 
same file  but swaped (little endian file)

my version of gfortran
=> gfortran -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: /home/tob/projects/gcc/configure 
--enable-languages=c,fortran --prefix=/projects/tob/gcc-trunk
Thread model: posix
gcc version 4.2.0 20061013 (experimental)

my computer
 => uname -a
Linux lxudc2 2.6.12-24mdk #1 Mon Jul 17 12:35:38 MDT 2006 x86_64 AMD 
Athlon(tm) 64 Processor 3500+ unknown GNU/Linux

May-be, I make an error...

thank you for your help
Sophie