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

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Message-ID: <20151028204450.GA25553@krava.redhat.com>
Date:	Wed, 28 Oct 2015 21:44:50 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
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

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.

jirka

> > jirka
> > 
> > 
> > ---
> > diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> > index 1e2e2d1d26b7..0d19d5447d6c 100644
> > --- a/tools/perf/Makefile.perf
> > +++ b/tools/perf/Makefile.perf
> > @@ -430,7 +430,7 @@ $(LIBAPI)-clean:
> >  	$(call QUIET_CLEAN, libapi)
> >  	$(Q)$(MAKE) -C $(LIB_DIR) O=$(OUTPUT) clean >/dev/null
> >  
> > -$(LIBBPF): FORCE
> > +$(LIBBPF): fixdep FORCE
> >  	$(Q)$(MAKE) -C $(BPF_DIR) O=$(OUTPUT) $(OUTPUT)libbpf.a
> >  
> >  $(LIBBPF)-clean:
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