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Subject: Re: Non-dwarf blocks detected by valgrind
From: Mark Wielaard <mark@klomp.org>
To: Thomas Koenig <tkoenig@netcologne.de>, Tobias Burnus
 <tobias@codesourcery.com>, Paul Richard Thomas
 <paul.richard.thomas@gmail.com>
Cc: gcc mailing list <gcc@gcc.gnu.org>, fortran <fortran@gcc.gnu.org>
Date: Mon, 25 Jan 2021 15:38:08 +0100
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Hi,

On Mon, 2021-01-25 at 15:05 +0100, Thomas Koenig via Gcc wrote:
> $ valgrind --version
> valgrind-3.15.0
> $ gfortran -g hello.f90
> $ valgrind ./a.out
> [...]
> --4184-- WARNING: Serious error when reading debug info
> --4184-- When reading debug info from
> /home/ig25/lib64/libgfortran.so.5.0.0:
> --4184-- Ignoring non-Dwarf2/3/4 block in .debug_info
> --4184-- WARNING: Serious error when reading debug info
> --4184-- When reading debug info from
> /home/ig25/lib64/libgfortran.so.5.0.0:
>=20
> [...]
>=20
> --4184-- WARNING: Serious error when reading debug info
> --4184-- When reading debug info from /home/ig25/lib64/libgcc_s.so.1:
> --4184-- Ignoring non-Dwarf2/3/4 block in .debug_info
>=20
>=20
> [...]
>=20
> --4184-- WARNING: Serious error when reading debug info
> --4184-- When reading debug info from
> /home/ig25/lib64/libquadmath.so.0.0.0:
> --4184-- Ignoring non-Dwarf2/3/4 block in .debug_info
>=20
> So, the problem (at least for me) is that libgfortran and
> other libraries are built in a format that valgrind can not
> understand, so it becomes much harder to debug libgfortran :-(

I have a patch for that:
https://code.wildebeest.org/git/user/mjw/valgrind/commit/?h=3Ddwarf5

It needs a little bit more cleanup, but should already work as
expected.

Cheers,

Mark