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Date: Tue, 14 Nov 2006 18:01:00 -0000
Subject: [Bug fortran/29835]  New: Error message of non-unknown edit descriptor needs improvement
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gfortran writes:
    read(1,'(Q,A)',iostat=i) n,line(:n)
                                      1
Warning: Unexpected element in format string at (1)

And if there is a long comment it may even look like:
XLINE
    1
Warning: Unexpected element in format string at (1)


Expected:
    read(1,'(Q,A)',iostat=i) n,line(:n)
             1
Warning: Unexpected element in format string at (1)
or even:
Warning: Unexpected element 'Q' in format string at (1)

(The run-time message is also slightly misaligned:
read(1,'(Q,A)') n,line(:n)
       1

---------- Test program ---------
integer, parameter :: MAXLINE = 255
character(MAXLINE) line
open(1,file='whatever', access='sequential',form='formatted',action='read')
do
   read(1,'(Q,A)',iostat=i) n,line(:n)
   if (i/=0) exit
! real work here
 enddo
end
---------- Test program ---------
Cf.
http://groups.google.com/group/comp.lang.fortran/browse_thread/thread/d968667b1e3219ab

 * * *

The Q edit descriptor is, e.g., described at
http://www.helsinki.fi/atk/unix/dec_manuals/cf77au/olrm0242.htm

It is documented but not supported in g77, seems to be a DEC extension and is
supported by ifort and sunf95.
I think, gfortran does not need to support it.


-- 
           Summary: Error message of non-unknown edit descriptor needs
                    improvement
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: burnus at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29835