[Bug fortran/39654] New: ABI bug: FTELL intrinsic function not capable of large files

[Bug fortran/39654] New: ABI bug: FTELL intrinsic function not capable of large files

[jb at gcc dot gnu dot org]

The FTELL function in libgfortran/io/intrinsics.c has the prototype

extern size_t PREFIX(ftell) (int *);

where the return value is the file position of the unit given in the int
argument. On 32-bit platforms this will not work for files > 4 GB. The return
type should be GFC_IO_INT which is a typedef for off_t which is 64-bit on LFS
capable systems.


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           Summary: ABI bug: FTELL intrinsic function not capable of large
                    files
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jb at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39654

[Bug fortran/39654] ABI bug: FTELL intrinsic function not capable of large files

[burnus at gcc dot gnu dot org]

------- Comment #1 from burnus at gcc dot gnu dot org  2009-05-27 17:29 -------
See also: http://gcc.gnu.org/wiki/LibgfortranAbiCleanup


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39654

[Bug fortran/39654] ABI bug: FTELL intrinsic function not capable of large files

[jb at gcc dot gnu dot org]

------- Comment #2 from jb at gcc dot gnu dot org  2009-05-27 17:44 -------
(In reply to comment #1)
> See also: http://gcc.gnu.org/wiki/LibgfortranAbiCleanup
> 

Yes, I know; I added the note to the wiki page after I filed this bug. ;-)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39654

[Bug fortran/39654] ABI bug: FTELL intrinsic function not capable of large files

[jvdelisle at gcc dot gnu dot org]

------- Comment #3 from jvdelisle at gcc dot gnu dot org  2009-07-22 00:02 -------
Is there a particular reason why we can not change this to off_t with 4.5.?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39654

[Bug fortran/39654] ABI bug: FTELL intrinsic function not capable of large files

[jb at gcc dot gnu dot org]

------- Comment #4 from jb at gcc dot gnu dot org  2009-07-29 12:46 -------
(In reply to comment #3)
> Is there a particular reason why we can not change this to off_t with 4.5.?
> 

Yes, it would break the ABI. As it's such a minor issue, IMHO it can be
postponed until we need to break the ABI for other reasons (e.g. the new array
descriptor for 4.6 and so on).

If one really wanted to fix it, we could have a new symbol in the library with
the correct prototype, and 4.5 could use that and older releases of gfortran
keep using the existing one. That can be done with symbol versioning, or just
manually. But I'm not sure it's worth the bother.


-- 

jb at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jvdelisle at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39654

[Bug fortran/39654] ABI bug: FTELL intrinsic function not capable of large files

[pault at gcc dot gnu dot org]

------- Comment #5 from pault at gcc dot gnu dot org  2009-12-17 21:04 -------
(In reply to comment #4)
> (In reply to comment #3)

Gentlemen,

What is the word on this? A WONTFIX?

Paul


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39654

[Bug fortran/39654] ABI bug: FTELL intrinsic function not capable of large files

[jb at gcc dot gnu dot org]

------- Comment #6 from jb at gcc dot gnu dot org  2009-12-19 11:03 -------
(In reply to comment #5)
> (In reply to comment #4)
> > (In reply to comment #3)
> 
> Gentlemen,
> 
> What is the word on this? A WONTFIX?

Certainly this should be fixed, eventually. Whether it will be fixed for 4.5 or
sometime later remains to be seen. Personally, I don't think it's particularly
high priority.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39654

[Bug fortran/39654] ABI bug: FTELL intrinsic function not capable of large files

[fxcoudert at gcc dot gnu dot org]

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fxcoudert at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2010-08-27 13:27:43
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39654