Re: tools/build: fixdep versus tools/lib/bpf

[Wangnan (F)]

On 2015/10/29 5:01, Arnaldo Carvalho de Melo wrote:
> 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.

Never see this message before. Tried make build-test, unable to reproduce
in my environment. Maybe my machine is not fast enough?

> > > > 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 :-)

So the problem is gone? Thanks to Jiri, and I'll add this to my local tree,
as a separated patch first.

Thank you.

> - Arnaldo


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