linux-kernel - Re: [PATCH 0/2] tools: Add a toplevel Makefile

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Date:	Wed, 28 Mar 2012 09:25:28 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...64.org>, Michal Marek <mmarek@...e.cz>,
	Sam Ravnborg <sam@...nborg.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] tools: Add a toplevel Makefile


* Borislav Petkov <bp@...64.org> wrote:

> On Mon, Mar 26, 2012 at 05:14:32PM +0200, Ingo Molnar wrote:
> > 
> > * Borislav Petkov <bp@...64.org> wrote:
> > 
> > > On Sat, Mar 24, 2012 at 08:44:12AM +0100, Ingo Molnar wrote:
> > > > Could this also be accessible via 'make tools' in the toplevel 
> > > > Makefile?
> > > > 
> > > > I'd love to be able to type:
> > > > 
> > > >   make -j tools perf install
> > > 
> > > Well,
> > > 
> > > you could do
> > > 
> > > $ make -j -C tools perf
> > 
> > Arguably I could also type:
> > 
> >   cd tools/perf; make -j install
> > 
> > :-)
> > 
> > So I just wanted to bring this up, that integrating it into the 
> > top level Makefile might make sense. Or not.
> 
> Right,
> 
> so from dealing with make in the last days, I can say that it's not a
> fun walk in the park :). The problem is having multiple targets like the
> following:
> 
> $ make -j tools perf install
> 
> I have to be able to differentiate in the Makefile which of the targets
> is a directory ("tools"), which is the actual tool name to build
> ("perf") and which is a special target ("install") which relates to the
> tool name coming before it on the command line and is not the "install"
> target of the main Makefile.
> 
> And it becomes nasty very fast if you reorder them
> 
> $ make -j install perf tools
> 
> where all that sequential info doesn't mean anything anymore.
> 
> So, the question is, what we actually want?
> 
> $ make -j tools perf install
> 
> is pretty cryptic wrt to which target we're actually building and having
> the -C switch makes stuff a bit clearer IMHO:
> 
> $ make -j -C tools perf install
> 
> Also, having "install" as the last target means IMO to build the tool
> before it and then install it.
> 
> In the end of the day, probably the most important thing is what is
> the use case for tools/ which makes most sense. I definitely think the
> 'help' target is a step in that direction. Being able to do
> 
> $ make -C tools
> 
> and it give you a short description is pretty helpful.
> 
> How about we have:
> 
> make tools-<toolname> install
> 
> or
> 
> make tools/perf install
> 
> from the toplevel kernel directory? Would that make more sense from a
> usability perspective?

I have no strong preference currently. I think since it affects 
kbuild it would be nice to know the opinion of the kbuild folks 
(Cc:-ed): how should the integration of tools/ proceed?

Thanks,

	Ingo
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