linux-kernel - Re: libelf-0.175 breaks objtool

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Message-ID: <20190206121638.3d2230c1@gandalf.local.home>
Date:   Wed, 6 Feb 2019 12:16:38 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: libelf-0.175 breaks objtool

On Tue, 5 Feb 2019 20:16:11 -0600
Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> On Tue, Feb 05, 2019 at 01:38:21PM -0500, Steven Rostedt wrote:
> > Just a FYI.
> > 
> > After a recent upgrade in debian testing, I was not able to build the
> > kernel. I have a custom build of gcc, so I thought it was strange that
> > I was getting something like this (took this from the web, as I don't
> > have the error anymore with the work around, and currently doing a full
> > build):
> > 
> > objdump: kernel/.tmp_signal.o: unable to initialize decompress status for section .debug_info                       
> > objdump: kernel/.tmp_signal.o: unable to initialize decompress status for section .debug_info                       
> > objdump: kernel/.tmp_signal.o: file format not recognized                                                           
> >   CC      arch/x86/kernel/platform-quirks.o                                                                         
> > objdump: arch/x86/kernel/.tmp_ebda.o: unable to initialize decompress status for section .debug_info                
> > objdump: arch/x86/kernel/.tmp_ebda.o: unable to initialize decompress status for section .debug_info                
> > objdump: arch/x86/kernel/.tmp_ebda.o: file format not recognized                                                    
> > objdump: mm/.tmp_swap_slots.o: unable to initialize decompress status for section .debug_info                       
> > objdump: mm/.tmp_swap_slots.o: unable to initialize decompress status for section .debug_info                       
> > objdump: mm/.tmp_swap_slots.o: file format not recognized                                     
> 
> I installed debian testing on a VM, which has libelf 0.175-2, but I

Hmm, I only have libelf-0.175 (no -2)

> can't recreate.  Can you share your config?
> 

It's just a distro config. Ah, I think it's because I'm compiling my
own home built gcc. There seems to be an incompatibility with the
binutils that I used and with libelf-0.175. If I build with just the
distro gcc, it works.

Bah, this means I need to recreate my gcc that I use to build my
kernels with :-p As I like to control which gcc I use.

-- Steve