Your message dated Sun, 03 Aug 2025 16:49:21 -0400
with message-id <[email protected]>
and subject line Closing bug
has caused the Debian Bug report #180764,
regarding gdb has some odd behaviour with integer math on ia64
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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180764: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=180764
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Package: gdb
Version: 5.3-2
Severity: normal
This does not apply on i386. I tested this on ia64; I have not checked
other 64-bit arches.
5 unsigned long a = 32;
(gdb) n
6 unsigned long x = 1 << a;
(gdb)
7 printf("%ld\n", x);
(gdb) p x
$1 = 0
(gdb) p 1 << a
$2 = 4294967296
I'm fairly sure that gcc is correct here; '1' is an int, so
left-shifting it should wrap at 32 bits and give 0.
(gdb) p sizeof(1)
$6 = 4
I can only presume that gdb is ignoring the size of integer constants.
[This kept me amused for an hour or so until I figured out that gdb
wasn't computing the same value as the program].
--
.''`. ** Debian GNU/Linux ** | Andrew Suffield
: :' : http://www.debian.org/ | Dept. of Computing,
`. `' | Imperial College,
`- -><- | London, UK
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IA64 isn't a supported Debian architecture anymore.
This bug is more than 20 years old; GDB has been almost completely
rewritten since then, and I don't recall seeing a similar problem
recently.
I'm taking the liberty to close this bug. Feel free reopen if it's
still applicable.
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Sergio
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