linux-kernel - Re: libelf-0.175 breaks objtool

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Date:   Tue, 7 Apr 2020 21:30:55 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-xfs <linux-xfs@...r.kernel.org>
Subject: Re: libelf-0.175 breaks objtool

On Tue, Apr 7, 2020 at 8:44 PM Arnd Bergmann <arnd@...db.de> wrote:
> On Tue, Apr 7, 2020 at 6:33 PM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> > On Tue, Apr 07, 2020 at 05:46:23PM +0200, Arnd Bergmann wrote:

> That is very possible. The -g has been there since xfs was originally merged
> back in 2002, and I could not figure out why it was there (unlike the
> -DSTATIC=""
> and -DDEBUG flags that are set in the same line).
>
> On the other hand, my feeling is that setting -g should not cause problems
> with objtool, if CONFIG_DEBUG_INFO is ok.

Nevermind, I now see the same problem in lots of files in a configuration
setting these options:

CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_INFO_REDUCED=y
# CONFIG_DEBUG_INFO_SPLIT is not set
CONFIG_DEBUG_INFO_DWARF4=y
CONFIG_DEBUG_INFO_BTF=y

Not sure which of these are actually relevant, but I had other configurations
setting DEBUG_INFO that are not affected.

       Arnd