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.
--
Andriy Gapon
