linux-kernel - Re: [PATCH v2] Fix objtool with clang

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Message-ID: <20161129144904.GD2361@redhat.com>
Date:   Tue, 29 Nov 2016 12:49:04 -0200
From:   Arnaldo Carvalho de Melo <acme@...hat.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Peter Foley <pefoley2@...oley.com>,
        LKML <linux-kernel@...r.kernel.org>, wangnan0@...wei.com
Subject: Re: [PATCH v2] Fix objtool with clang

Em Tue, Nov 29, 2016 at 03:39:35PM +0100, Jiri Olsa escreveu:
> On Tue, Nov 29, 2016 at 12:33:15PM -0200, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Nov 29, 2016 at 03:28:08PM +0100, Jiri Olsa escreveu:
> > > On Mon, Nov 28, 2016 at 05:40:46PM -0200, Arnaldo Carvalho de Melo wrote:
> > > 
> > > SNIP
> > > 
> > > >   CC       /tmp/build/perf/builtin-buildid-list.o
> > > >   LD       /tmp/build/perf/pmu-events/pmu-events-in.o
> > > >   CC       /tmp/build/perf/arch/x86/util/intel-bts.o
> > > >   CC       /tmp/build/perf/builtin-buildid-cache.o
> > > >   CC       /tmp/build/perf/builtin-list.o
> > > >   LD       /tmp/build/perf/arch/x86/util/libperf-in.o
> > > >   MKDIR    /tmp/build/perf/arch/x86/tests/
> > > >   CC       /tmp/build/perf/arch/x86/tests/regs_load.o
> > > > /tmp/build/perf/.plugin_jbd2.o.cmd:3: *** empty variable name.  Stop.
> > > > Makefile:192: recipe for target '/tmp/build/perf/plugin_jbd2-in.o' failed
> > > > make[2]: *** [/tmp/build/perf/plugin_jbd2-in.o] Error 2
> > > > Makefile.perf:591: recipe for target '/tmp/build/perf/libtraceevent-dynamic-list' failed
> > > > make[1]: *** [/tmp/build/perf/libtraceevent-dynamic-list] Error 2
> > > > make[1]: *** Waiting for unfinished jobs....
> > > >   MKDIR    /tmp/build/perf/arch/x86/tests/
> > > >   CC       /tmp/build/perf/arch/x86/tests/arch-tests.o
> > > > <SNIP>
> > > >   CC       /tmp/build/perf/util/pmu.o
> > > >   CC       /tmp/build/perf/util/pmu-flex.o
> > > >   LD       /tmp/build/perf/util/libperf-in.o
> > > >   LD       /tmp/build/perf/libperf-in.o
> > > > Makefile:108: recipe for target 'install-bin' failed
> > > > make: *** [install-bin] Error 2
> > > > make: Leaving directory '/home/acme/git/linux/tools/perf'
> > > > [acme@...et linux]$ 
> > > 
> > > how about following fix.. it gets rid of the -Wp,MT option completely
> > > so it should address Peter's issue.. it also makes fixdep more robust
> > > and makes it wait for first target before spitting out dependencies
> > 
> > So this should replace Peter's patch? On top? I'm checking that now...
> 
> it's replacement.. also I'll put it into 2 patches

Ok, just tested, Peter's patch works if I remove ccache, with your patch
replacing it, everything works, with and without ccache, on f25, and it
builds on f24 without ccache, in one of the containers I have.

- Arnaldo