linux-kernel - Re: [PATCH] tools build: Use fixdep with OUTPUT path prefix

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Message-ID: <20151126193106.GG28162@kernel.org>
Date:	Thu, 26 Nov 2015 16:31:06 -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>,
	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] tools build: Use fixdep with OUTPUT path prefix

Em Thu, Nov 26, 2015 at 07:50:55PM +0100, Jiri Olsa escreveu:
> On Thu, Nov 26, 2015 at 07:12:04PM +0100, Jiri Olsa wrote:
> > On Thu, Nov 26, 2015 at 01:31:30PM -0300, Arnaldo Carvalho de Melo wrote:
> > > Em Thu, Nov 26, 2015 at 02:54:03PM +0100, Jiri Olsa escreveu:
> > > > Using FEATURE-INCLUDE in bpf subproject in case bpf is built
> > > > via perf. Keep the current features detection for other cases.
> > > > 
> > > > Cc: Wang Nan <wangnan0@...wei.com>
> > > > Link: http://lkml.kernel.org/n/tip-utuczk899ckz6qtggqvhm7yu@git.kernel.org
> > > > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > > 
> > > Clashes with:
> > > 
> > > d8ad6a15cc3a ("tools lib bpf: Don't do a feature check when cleaning")
> > > 
> > > That has, at that point:
> > > 
> > > +check_feat := 1
> > > +NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
> > > +ifdef MAKECMDGOALS
> > > +ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
> > > +  check_feat := 0
> > > +endif
> > > +endif
> > > +
> > > +ifeq ($(check_feat),1)
> > >  include $(srctree)/tools/build/Makefile.feature
> > > +endif
> > > 
> > > On a related note:
> > > 
> > >   [acme@zoo linux]$ make O=/tmp/build/perf -C tools/perf
> > >   make: Entering directory '/home/git/linux/tools/perf'
> > >     BUILD:   Doing 'make -j4' parallel build
> > >   make[2]: Nothing to be done for 'fixdep'.
> > >   make: Leaving directory '/home/git/linux/tools/perf'
> > > 
> > > Can we get away with that "make[2]: Nothing to be done for 'fixdep'."
> > > line?
> > 
> > I'll check on that
> 
> good we don't supress all make's output, sometimes it
> finds a bug ;-) please check with attached patch..
> 
> thanks,
> jirka

Clashes with:

commit 5725dd8fa888b4dcdff58241f9d3d3ac42a048e2
Author: Wang Nan <wangnan0@...wei.com>
Date:   Tue Nov 24 13:36:06 2015 +0000

    tools build: Clean CFLAGS and LDFLAGS for fixdep


And this should even be already in tip, let me see, yes:

https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?h=perf/core&id=5725dd8fa888b4dcdff58241f9d3d3ac42a048e2

I'm fixing this up, as this one is easy.

- Arnaldo


 
> 
> ---
> Adding OUTPUT path prefix for fixdep target
> so we use it properly in out of tree builds.
> 
> If the fixdep already existed in the tree, the out of
> tree build would see it already exist and did not build
> the out of tree version, as reported by Arnaldo:
> 
>   [acme@zoo linux]$ make O=/tmp/build/perf -C tools/perf
>   make: Entering directory '/home/git/linux/tools/perf'
>     BUILD:   Doing 'make -j4' parallel build
>   make[2]: Nothing to be done for 'fixdep'.
>   make: Leaving directory '/home/git/linux/tools/perf'
> 
> Reported-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> Link: http://lkml.kernel.org/n/tip-hsrwmiogt9menjsg7uaxqvq2@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/build/Makefile         | 2 +-
>  tools/build/Makefile.include | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/build/Makefile b/tools/build/Makefile
> index a93036272d43..0d5a0e3a8fa9 100644
> --- a/tools/build/Makefile
> +++ b/tools/build/Makefile
> @@ -25,7 +25,7 @@ export Q srctree CC LD
>  MAKEFLAGS := --no-print-directory
>  build     := -f $(srctree)/tools/build/Makefile.build dir=. obj
>  
> -all: fixdep
> +all: $(OUTPUT)fixdep
>  
>  clean:
>  	$(call QUIET_CLEAN, fixdep)
> diff --git a/tools/build/Makefile.include b/tools/build/Makefile.include
> index 4e09ad617a60..6d5edd275bef 100644
> --- a/tools/build/Makefile.include
> +++ b/tools/build/Makefile.include
> @@ -4,7 +4,7 @@ ifdef CROSS_COMPILE
>  fixdep:
>  else
>  fixdep:
> -	$(Q)$(MAKE) -C $(srctree)/tools/build fixdep
> +	$(Q)$(MAKE) -C $(srctree)/tools/build $(OUTPUT)fixdep
>  endif
>  
>  .PHONY: fixdep
> -- 
> 2.4.3
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