linux-kernel - Re: [PATCH v21 00/20] perf, tools: Add support for PMU events in JSON format

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Message-ID: <20160922150022.GA20134@krava>
Date:   Thu, 22 Sep 2016 17:00:22 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
        peterz@...radead.org, maddy@...ux.vnet.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v21 00/20] perf, tools: Add support for PMU events in
 JSON format

On Mon, Sep 19, 2016 at 09:28:20PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Sep 19, 2016 at 09:02:58PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Mon, Sep 19, 2016 at 08:37:53PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > yeah, changing that typedef + true def to plain include <stdbool.h>
> > > makes it progress to the next failure, which is in cross compilation
> > > environments, such as using fedora 24 + the Android NDK to try to build
> > > a ARM android binary.
> 
> > 14 fedora:24-x-ARC-uClibc: FAIL
> >   GEN      /tmp/build/perf/pmu-events/pmu-events.c
> > /bin/sh: /tmp/build/perf/pmu-events/jevents: cannot execute binary file: Exec format error
> > pmu-events/Build:11: recipe for target '/tmp/build/perf/pmu-events/pmu-events.c' failed
> > make[2]: *** [/tmp/build/perf/pmu-events/pmu-events.c] Error 126
> > Makefile.perf:461: recipe for target '/tmp/build/perf/pmu-events/pmu-events-in.o' failed
> > make[1]: *** [/tmp/build/perf/pmu-events/pmu-events-in.o] Error 2
> > make[1]: *** Waiting for unfinished jobs....
> 
> Jiri, we need something similar to scripts/Makefile.host :-\
> 
> Calling it a day, perhaps, for now, we should just detect that it is a
> corss compile env (CROSS_COMPILE is set) and exclude all this code from
> the build, emitting a warning.
> 
> I left what I did at the tmp.perf/core branch of my repo at
> git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git.

as discussed on irc we will disable it for cross builds now,
because we dont have good solution at the moment.. it's
similar case as for fixdep tool:

    3a70fcd3a4db tools build: Fix cross compile build
    ...
    We need to add support for host side tools build, meanwhile
    disabling fixdep usage for cross arch builds.

I'll make a change to disable this for crossbuild and
work on common solution later

thanks,
jirka