Re: ctfconvert: rc = 1 Unsupported version [_dwarf_info_load(229)]

On 27/11/2021 10:42, Andriy Gapon wrote:
> On 26/11/2021 21:48, Mark Johnston wrote:
>> On Fri, Nov 26, 2021 at 02:00:27PM -0500, Mark Johnston wrote:
>>> Thanks, I can reproduce it now.
>>>
>>> Our libdwarf is complaining that the first compilation unit header in
>>> .debug_info contains an unsupported DWARF version number (libdwarf only
>>> supports 2, 3 and 4).  In files compiled by clang it ends up being zero.
>>> For instance, compiling bin/cat and dumping the .debug_info section:
>>>
>>> gcc10:
>>>   c1250000 04000000 00000801 00000000
>>>             ^ DWARF version
>>> clang:
>>>    01000000 00000000 4e230000 00000000
>>>
>>> llvm-dwarfdump and binutils readelf are somehow still able to find a
>>> valid-looking unit header, but I haven't yet been able to figure out how
>>> they do that from reading the DWARF 4/5 specs or the LLVM sources.
>> |Ah, we recently started configuring clang to compress debug sections by 
>> default, and our libdwarf doesn't know how to handle that. As an interim 
>> workaround this could simply be disabled with WITH_CTF is configured:
> 
> Oh wow, you were very fast at figuring this out.
> Thank you very much!
> 
> I'll give the build change a whirl first and then test D33139 a bit later.

Tested both (individually) and both do the job just as expected.

-- 
Andriy Gapon