linux-kernel - Re: [PATCH] perf tool: Build jitdump only on supported archs

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Date:	Thu, 10 Mar 2016 17:04:36 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Andi Kleen <andi@...stfloor.org>, Borislav Petkov <bp@...e.de>,
	Colin Ian King <colin.king@...onical.com>,
	David Ahern <dsahern@...il.com>,
	Davidlohr Bueso <dbueso@...e.com>,
	He Kuang <hekuang@...wei.com>, Mel Gorman <mgorman@...e.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH] perf tool: Build jitdump only on supported archs

On Thu, Mar 10, 2016 at 12:57:00PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Mar 10, 2016 at 10:32:29AM +0100, Jiri Olsa escreveu:
> > On Mon, Mar 07, 2016 at 04:44:36PM -0300, Arnaldo Carvalho de Melo wrote:
> > 
> > SNIP
> > 
> > > ----------------------------------------------------------------
> > > Adrian Hunter (5):
> > >       perf inject: Hit all DSOs for AUX data in JIT and other cases
> > >       perf session: Simplify tool stubs
> > >       perf jit: Let jit_process() return errors
> > >       perf jit: Move clockid validation
> > >       perf tools: Use 64-bit shifts with (TSC) time conversion
> > 
> > hi,
> > perf build failed for me on s390x because of jitdump feature.
> > 
> > Attached patch tries to enable the build only on supported archs.
> > 
> > I haven't followed this feature too much, so I might have missed
> > something.. anyway it builds on s390x now ;-) I took the list of
> > archs from util/genelf.h
> 
> Hi Jiri,
> 
> 	This may be related to this cset, still not in tip/perf/core:
> 
>   commit 46dad054a19297af65c417c97cb920aa5bdf7e8c
>   Author: Arnaldo Carvalho de Melo <acme@...hat.com>
>   Date:   Mon Mar 7 18:48:45 2016 -0300
> 
>     perf jitdump: DWARF is also needed
> 
> Can you check if without this one perf builds on s390? 
> 
> This patch is to make it build on ubuntu without libdw, i.e. it requires
> both libdw and libelf, the way I fixed it may not be the best and
> probably we need to fold these two patches before sending to Ingo, since
> your patch essentially rewrites my previous patch :-)
> 
> Can you please check that?

well there's following line in util/genelf.h:

#else
#error "unsupported architecture"
#endif

which makes the build fail on unssuported arch,
even without your patch:

  CC       util/jitdump.o
In file included from util/jitdump.c:23:
util/genelf.h:41:2: error: #error "unsupported architecture"
util/genelf.h:44:5: error: "GEN_ELF_CLASS" is not defined
mv: cannot stat `util/.jitdump.o.tmp': No such file or directory
make[3]: *** [util/jitdump.o] Error 1


jirka