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Re: [PATCH 1/2] xen: move CONFIG_DEBUG_INFO out of EXPERT section
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 7 Mar 2023 12:42:24 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 07 Mar 2023 11:43:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 07.03.2023 12:33, Juergen Gross wrote:
> On 07.03.23 11:31, Jan Beulich wrote:
>> On 07.03.2023 07:32, Juergen Gross wrote:
>>> Using a rather oldish gcc (7.5) it was verified that code generation
>>> doesn't really differ between CONFIG_DEBUG_INFO on or off without
>>> CONFIG_DEBUG being set (only observed differences were slightly
>>> different symbol addresses, verified via "objdump -d"). The old gcc
>>> version selection was based on the assumption, that newer gcc won't
>>> regress in this regard.
>>
>> This is good to know, but I'm still curious about the mentioned
>> differences in symbol addresses: If code generation didn't change, what
>> caused addresses to differ? Is that merely because individual functions
>> or objects are emitted in different order by the compiler? (If so I'd
>> be inclined to infer that comparing generated code must have been
>> quite a bit of effort, as first of all you would have had to undo that
>> re-ordering.)
>
> I did a simple diff of the two disassembly outputs and got only small
> differences for %rip relative addresses (the differences were in the
> range of +/- 32 bytes).
That's still odd and hence imo wants understanding. Do you still have
both binaries around?
Jan
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