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From: "ssbssa at sourceware dot org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug cli/7285] printing expression gives different result to
 executing equivalent statement
Date: Tue, 09 Jan 2024 18:50:09 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D7285

Hannes Domani <ssbssa at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ssbssa at sourceware dot o=
rg

--- Comment #2 from Hannes Domani <ssbssa at sourceware dot org> ---
(In reply to dcoutts from comment #0)
> 6        lx =3D -(1 << 63);
> (gdb) n
> (gdb) p lx
> $2 =3D -2147483648

Isn't that undefined behavior?

gcc has this warning:
```
gdb_bug.c: In function 'main':
gdb_bug.c:6:12: warning: left shift count >=3D width of type
[-Wshift-count-overflow]
   lx =3D -(1 << 63);
            ^~
```

And gdb also shows a warning nowadays:
```
(gdb) p (long) -(1 << 63)
warning: left shift count >=3D width of type
$1 =3D 0
```

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