linux-kernel - Re: tools/build: fixdep versus tools/lib/bpf

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Message-ID: <20151028210125.GE19695@kernel.org>
Date:	Wed, 28 Oct 2015 18:01:25 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, Wang Nan <wangnan0@...wei.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: tools/build: fixdep versus tools/lib/bpf

Em Wed, Oct 28, 2015 at 09:44:50PM +0100, Jiri Olsa escreveu:
> On Wed, Oct 28, 2015 at 05:37:52PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Oct 28, 2015 at 09:13:52PM +0100, Jiri Olsa escreveu:
> > > On Wed, Oct 28, 2015 at 01:30:40PM -0300, Arnaldo Carvalho de Melo wrote:
> > > > Hi Jiri, Wang,
> > > > 
> > > > 	I'm getting these while doing 'make -C tools/perf build-test':
> > > > 
> > > >   LD       fixdep-in.o
> > > >   LINK     fixdep
> > > > /bin/sh: /home/acme/git/linux/tools/build/fixdep: Permission denied
> > > > make[6]: *** [bpf.o] Error 1
> > > > make[5]: *** [libbpf-in.o] Error 2
> > > > make[4]: *** [/home/acme/git/linux/tools/lib/bpf/libbpf.a] Error 2
> > > > make[4]: *** Waiting for unfinished jobs....
> > > > 
> > > > 
> > > > It happens at different tests, i.e. seems like a race somewhere in the
> > > > build system, can you take a look? It happens with my perf/ebpf branch.
> > > 
> > > could not reproduce, but looks like attached patch should help
> > 
> > I'll test this now, i.e. make it go thru a 'make -C tools/perf
> > build-test'.
> > 
> > In the interest of speeding up things, please provide an explanation of
> > why this should be applied, so that I can add it to the changeset log.
> > 
> > Thanks a bunch!
> > 
> 
> The fixdep tool needs to be built as the first binary.
> Libraries are built in paralel, so each of them needs
> to depend on fixdep target.


I really need a faster machine, you provided the answer at this point:

- make_tags_O: cd . && make -f Makefile O=/tmp/tmp.xfRz6THR6o
  DESTDIR=/tmp/tmp.y0nuN0Fr9n tags
- make_cscope_O: cd . && make -f Makefile O=/tmp/tmp.O6phQXHU4z
  DESTDIR=/tmp/tmp.5mdMeF1pH2 cscope
- tarpkg: ./tests/perf-targz-src-pkg .
- make -C <kernelsrc> tools/perf
- make -C <kernelsrc>/tools perf

Almost there :-)

- Arnaldo
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