linux-kernel - Re: [PATCH] perf tools: Don't use brace expansion.

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Date:	Tue, 17 Aug 2010 12:42:37 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Bernd Petrovitsch <bernd@...prog.at>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Kusanagi Kouichi <slash@...auone-net.jp>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tools: Don't use brace expansion.

Em Tue, Aug 17, 2010 at 01:58:00PM +0200, Bernd Petrovitsch escreveu:
> On Mon, 2010-08-16 at 12:50 -0300, Arnaldo Carvalho de Melo wrote:
> > Em Mon, Aug 16, 2010 at 05:43:47PM +0200, Bernd Petrovitsch escreveu:
> > > On Mon, 2010-08-16 at 12:29 -0300, Arnaldo Carvalho de Melo wrote:
> > > > More seriously, so there is a reason for that to be like that and you're
> > > > not aware of any other shorter or more convenient way of achieving that
> > 
> > > One (obvious) alternative is to have rules triggering on the
> > > non-existence of these directories.
> > 
> > Can you provide those please?
> [...]
> > Right, not enough, what those mkdir calls were added for was exactly for
> > a different usecase:
> > 
> > make -C tools/perf -O=~/build/perf/
> 
> Thanks.
> 
> The following patch below at the end works for me. Alas, it is against
> vanilla main line.

Adding $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)common-cmds.h there, to have it look:

+# we compile into subdirectories. if the target directory is not the source directory, they might not exists. So
+# we depend the various files onto their directories.
+$(LIB_OBJS) $(BUILTIN_OBJS) $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)common-cmds.h: $(sort $(dir $(LIB_OBJS) $(BUILTIN_OBJS)))
+# In the second step, we make a rule to actually create these directories
+$(sort $(dir $(LIB_OBJS) $(BUILTIN_OBJS))):
+       mkdir -p $@ 2>/dev/null
+

As it was failing when I did:

rm -rf ~/build/perf
make -C tools/perf O=~/build/perf

With that it retains the existing functionality,

Thanks,

- Arnaldo
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