linux-kernel - Re: [RFC PATCH] media: consolidation of -I flags

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Message-ID: <20101005235355.GB18586@haskell.muteddisk.com>
Date:	Tue, 5 Oct 2010 16:53:55 -0700
From:	matt mooney <mfm@...eddisk.com>
To:	T Dent <tdent48227@...il.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Michal Marek <mmarek@...e.cz>, linux-media@...r.kernel.org,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [RFC PATCH] media: consolidation of -I flags

On 18:27 Tue 05 Oct     , T Dent wrote:
> On 10/5/10, Sam Ravnborg <sam@...nborg.org> wrote:
> > On Sun, Sep 26, 2010 at 02:00:47PM -0700, matt mooney wrote:
> >> I have been doing cleanup of makefiles, namely replacing the older style
> >> compilation flag variables with the newer style. While doing this, I
> >> noticed that the majority of drivers in the media subsystem seem to rely
> >> on a few core header files:
> >>
> >> 	-Idrivers/media/video
> >> 	-Idrivers/media/common/tuners
> >> 	-Idrivers/media/dvb/dvb-core
> >> 	-Idrivers/media/dvb/frontends
> >>
> >> This patch removes them from the individual makefiles and puts them in
> >> the main makefile under media.
> > Using subdir-ccflags-y has one drawback you need to be aware of.
> > The variable is _not_ picked up if you build individual drivers like
> > this:
> >
> >
> >      make drivers/media/dvb/b2c2/
> >
> > So with this patch applied it is no longer possible to do so.
> > It is better to accept the duplication rather than breaking
> > the build of individual drivers.
> >
> >>
> >> If neither idea is considered beneficial, I will go ahead and replace
> >> the older variables with the newer ones as is.
> >
> > This is the right approach.
> >
> > You could consider to do a more general cleanup:
> > 1) replace EXTRA_CFLAGS with ccflags-y (the one you suggest)
> > 2) replace use of <module>-objs with <module>-y
> > 3) break continued lines into several assignments
> 
> I have a question when you say this do you mean change something like this:
> 
> r8187se-objs :=
> 
> to
> 
> r8187se-y :=

Yes, that is what is meant, but remember to change conditional inclusions to the
kbuild idiom.

> If so, I could start working on that in the staging directory.

That's cool; the staging makefiles need extra attention though, so you really
need to go through and make sure you understand what is and isn't needed. And
check to see what drivers are on their way out so that you don't waste your
time.

Now, I do have some of these queued up for other parts of the kernel, so please
let me know before you start sending in patches for other parts that I have
already worked on.

Thanks,
mfm

> >    People very often uses '\' to break long lines, where a
> >    simple += would be much more readable.
> >    But this topic may be personal - I never uses "\" in my .c code unless in
> > macros,
> >    and I have applied the same rule for Makefiles.
> >    An ugly example is drivers/media/Makefile
> > 4) In general use ":=" instead of "=".
> >    Add using "+=" as first assignment is OK - but it just looks plain wrong
> > 5) some files has a mixture of spaces/tabs (are red in my vim)
> >    dvb-core/Makefile is one such example
> > 6) remove useless stuff
> >    siano/Makefile has some strange assignments to EXTRA_CFLAGS
> > 7) Likely a few more items to look after...
> >
> > This is more work - but then you finish a Makefile rather than doing a
> > simple
> > conversion.
> >
> > 	Sam
> > --
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> >
> 
> Thanks,
> 
> Tracey D
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