linux-kernel - Re: new objtool warnings again...

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Message-ID: <CA+55aFw36rOP_A=ctSu9AFrxzN-QQE4einLr40tdxgPPAUtiTA@mail.gmail.com>
Date:   Fri, 23 Sep 2016 14:06:03 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>, Michal Marek <mmarek@...e.cz>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: new objtool warnings again...

On Fri, Sep 23, 2016 at 1:33 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> So this code is clearly missing the magic to tell gcc that the asm
> needs a frame pointer.

Independently of that, the objtool build seems racy or somehow
fragile. I've now twice gotten into a situation where I end up getting

  cat: /home/torvalds/v2.6/linux/tools/objtool/.fixdep.o.d: No such
file or directory
  make[4]: *** [/home/torvalds/v2.6/linux/tools/objtool/fixdep.o] Error 1
  make[3]: *** [/home/torvalds/v2.6/linux/tools/objtool/fixdep-in.o] Error 2
  make[2]: *** [fixdep] Error 2
  make[1]: *** [objtool] Error 2
  make: *** [tools/objtool] Error 2

with just the right timings, and then ccache ends up remembering that
as a build failure and causing that to be "sticky" even across "git
clean -dqfx" builds (and the "ccache -C" clears it).

Adding Michal to the cc, in case he can see what the problem is.

                 Linus