[RFC] libdw: prepend current directory in read_srclines

Torsten Polle Torsten.Polle@gmx.de
Wed Mar 29 20:15:00 GMT 2017

Hi Mark,

> Am 27.03.2017 um 22:45 schrieb Mark Wielaard <mark@klomp.org>:
> Hi Torsten,
> On Sun, Mar 26, 2017 at 08:35:50PM +0200, Torsten Polle wrote:
>> I observed that readelf and elfutils sometimes report different results.
> Do you have an example of this? It would be good to have a testcase.
>> PFA a patch that corrects this. I’m not sure whether the way I tackled
>> the problem is acceptable.
> I see why you are proposing this. The DWARF spec does say about the
> include_directories "Each path entry is either a full path name or is
> relative to the current directory of the compilation". So your patch
> does make sense.
> But it does depend on what users of dwarf_getsrclines expect.
> Or any use of Dwarf_Line/Dwarf_Files. I think those users expect that
> the returned file names can be relative. And that they should make them
> absolute using index zero or the comp_dir themselves.
> So if you do have an example where the expected output isn't what you
> believe it should be we should examine if there is some other way to
> do the right thing.
> Cheers,
> Mark

thanks for the answer. I’ll come back with an example, which is SystemTap based. :-)

Please allow for some delay. I expect to provide an example in about two weeks.


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