From: Sam Ravnborg <sam@ravnborg.org>
To: Michal Marek <mmarek@suse.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>,
Ben Hutchings <ben@decadent.org.uk>,
Arnd Bergmann <arnd@arndb.de>,
Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
stable@vger.kernel.org, 856474@bugs.debian.org
Subject: Re: [PATCH] Kbuild.include: addtree: Remove quotes before matching path
Date: Mon, 3 Apr 2017 22:20:33 +0200 [thread overview]
Message-ID: <20170403202033.GB29829@ravnborg.org> (raw)
In-Reply-To: <7bebf377-1268-ee02-c19b-f2d16d69cf79@suse.com>
On Mon, Apr 03, 2017 at 03:25:10PM +0200, Michal Marek wrote:
> On 2017-04-03 09:42, Masahiro Yamada wrote:
> > Each Makefile knows it wants to see
> > additional headers in the source tree, or objtree.
> >
> > I am guessing the right approach in a long run is,
> > we require -I to specify $(srctree) or $(objtree) explicitly.
> >
> > ccflags-y := -I$(srctree)/foo/bar/baz
> >
> > or
> >
> > ccflags-y := -I$(objtree)/foo/bar/baz
> >
> >
> > (For the latter, we can omit $(objtree)/ as it is ./)
> >
> >
> > Then, delete $(call flags,_c_flags) after the conversion.
>
> Agreed. The addtree function is more of a hack to make things just work
> with O=, but AFAIK there is no clean way to implement VPATH for -I
> arguments. So it's sensible to get rid of the hack. It looks like it's
> going to be lot of work though:
>
> $ git grep -e '-I' -- '*Makefile*' | wc -l
> 732
> $ git grep -e '-I *\$(\(src\|obj\)tree)' -- '*Makefile*' | wc -l
> 166
There was a goal long time ago that moving the kernel source should
not trigger a rebuild.
Any hardcoded path would violate this (like $(srctree), $(objtree))
I dunno if this is really something to aim for today.
I have personally from time to time renamed the directory where
I have kernel soruce (which is seen like moving the kernel source),
and would not be happy if this always triggered a full rebuild.
But this is frankly a corner case.
Sam
next prev parent reply other threads:[~2017-04-03 20:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-18 21:58 [PATCH] Kbuild.include: addtree: Remove quotes before matching path Ben Hutchings
2017-04-03 7:42 ` Masahiro Yamada
2017-04-03 13:25 ` Michal Marek
2017-04-03 20:20 ` Sam Ravnborg [this message]
2017-04-04 3:56 ` Masahiro Yamada
2017-04-04 7:02 ` Michal Marek
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