[Bug gdb/12521] New: sizeof() wrong

[Bug gdb/12521] New: sizeof() wrong

[carlo at alinoe dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12521

           Summary: sizeof() wrong
           Product: gdb
           Version: 7.0
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned@sourceware.org
        ReportedBy: carlo@alinoe.com


I have a pure 64-bit machine (x86_64-linux-gnu),
uint64_t is unsigned long is 64 bit.

GNU gdb (GDB) 7.0.1-debian
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
(gdb) p/x -1UL
$1 = 0xffffffff
(gdb) p/x (unsigned long)-1
$2 = 0xffffffff
(gdb) p sizeof(unsigned long)
$3 = 4
(gdb) p/x -1ULL
$4 = 0xffffffffffffffff
(gdb) p/x (unsigned long long)-1
$5 = 0xffffffffffffffff
(gdb) p sizeof(unsigned long long)
$6 = 8


That is the exact output that you'd expect on a 32-bit machine!

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[Bug gdb/12521] sizeof() wrong

[schwab@linux-m68k.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12521

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> 2011-02-27 08:31:37 UTC ---
Depending on which target you debug, gdb can do both 32 and 64 bit, which is
decided only after attaching to a target.

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[Bug gdb/12521] sizeof() wrong

[fchen0000 at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12521

fchen <fchen0000 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fchen0000 at gmail dot com
            Version|7.0                         |7.4

--- Comment #2 from fchen <fchen0000 at gmail dot com> 2012-03-21 03:52:36 UTC ---
Attach gdb to /bin/ls or set architecture manually won't work. It's a bug.

=============================================================================
gdb /bin/ls

GNU gdb (GDB) 7.4
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /bin/ls...(no debugging symbols found)...done.
(gdb) whatis sizeof(float)
type = int
(gdb) show architecture
The target architecture is set automatically (currently i386:x86-64)
(gdb) set architecture i386:x86-64
The target architecture is assumed to be i386:x86-64
(gdb) whatis sizeof(float)
type = int

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[Bug gdb/12521] sizeof() wrong

[sergiodj at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12521

Sergio Durigan Junior <sergiodj at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sergiodj at redhat dot com

--- Comment #3 from Sergio Durigan Junior <sergiodj at redhat dot com> 2012-03-27 03:35:40 UTC ---
(In reply to comment #2)
> Attach gdb to /bin/ls or set architecture manually won't work. It's a bug.
> 
> =============================================================================
> gdb /bin/ls
> 
> GNU gdb (GDB) 7.4
> Copyright (C) 2012 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-unknown-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>...
> Reading symbols from /bin/ls...(no debugging symbols found)...done.
> (gdb) whatis sizeof(float)
> type = int
> (gdb) show architecture
> The target architecture is set automatically (currently i386:x86-64)
> (gdb) set architecture i386:x86-64
> The target architecture is assumed to be i386:x86-64
> (gdb) whatis sizeof(float)
> type = int


What is the output you are expecting?  `sizeof (float)' is giving the right
size of the `float' type.

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[Bug gdb/12521] sizeof() wrong

[fchen0000 at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12521

--- Comment #4 from fchen <fchen0000 at gmail dot com> 2012-03-27 11:45:51 UTC ---
sizeof() should return size_t not int. They are different.

> 
> What is the output you are expecting?  `sizeof (float)' is giving the right
> size of the `float' type.

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[Bug gdb/12521] sizeof() wrong

[tromey at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12521

Tom Tromey <tromey at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |tromey at redhat dot com
         Resolution|                            |DUPLICATE

--- Comment #5 from Tom Tromey <tromey at redhat dot com> 2012-03-28 18:29:14 UTC ---
I sent a patch for this a long time ago.
I think it needed a few tweaks though.
http://sourceware.org/ml/gdb-patches/2009-01/msg00014.html

*** This bug has been marked as a duplicate of bug 9164 ***

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