On Tue, Aug 11 2009, Sune Vuorela wrote:
> On 2009-08-11, Manoj Srivastava <sriva...@debian.org> wrote:
>> Hmm. I see very little benefit here. Firstly, to use build id,
>> you have to intercept the upstream build system and add --build-id
>> (and perhaps the --build-id-style) option to ld, instead of the current
>> method of letting the upstream build happen and working on the produced
>> objects -- this is more intrusive. And what do we gain?
>
> The plan is to make --build-id the default (As it is on many other
> distributions).
>
>>
>> * For the "build ID" method, GDB looks in the `.build-id'
>> subdirectory of the global debug directory for a file named
>> `NN/NNNNNNNN.debug', where NN are the first 2 hex characters of
>> the build ID bit string, and NNNNNNNN are the rest of the bit
>> string. (Real build ID strings are 32 or more hex characters, not
>> 10.)
>>
>> So, we would still need to create "/usr/lib/debug/"
>> . /full/path/to/lib_or_binary/ in either case, and instead of the
>
> no. it would be /usr/lib/debug/.build-id/NN/NNNNNN.debug
Right. Mostly human unreadable.
>> lib-or-exec name, create NN/NNNNNNNN.debug file there (which is non
>> human readable, really). What have we gained? There is no potential for
>> file name conflicts, since if there are file name conflicts in the
>> debug symbol files, there would be file name conflicts in the
>> corresponding packages, which is already a bug in Debian.
>>
>> I see added complexity with no real benefit for us: it might
>> have value in an environment where file conflicts are not verboten.
>
> And the next step is to provide /usr/lib/debug/.build-id exported from
> some internet service so that you download debugging symbols on demand,
> for example thru drkonqi or bug-buddy or maybe directly with gdb.
You can just export /usr/lib/debug/ from the central service
equally easily, no difference there -- you can just provide the current
Sid/testing/stable snapshot.
> Having a reliable way of getting from a random library version and
> random executable version to get the exact corresponding debug symbols,
> the build-id method is just much more reliable.
Except you have not indicated how you (or debhelper) is going to
intercept ld to add the requisite arguments.
manoj
--
Murray's Rule: Any country with "democratic" in the title isn't.
Manoj Srivastava <sriva...@debian.org> <http://www.debian.org/~srivasta/>
1024D/BF24424C print 4966 F272 D093 B493 410B 924B 21BA DABB BF24 424C
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