linux-kernel - Re: Building a subdirectory ignores parent subdir-ccflags

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Date:	Tue, 16 Aug 2016 00:07:18 +0200
From:	Michal Marek <mmarek@...e.com>
To:	Joe Perches <joe@...ches.com>,
	linux-kbuild <linux-kbuild@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Yann E. MORIN" <yann.morin.1998@...e.fr>,
	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	lustre-devel@...ts.lustre.org
Subject: Re: Building a subdirectory ignores parent subdir-ccflags

Dne 15.8.2016 v 23:29 Joe Perches napsal(a):
> On Mon, 2016-08-15 at 14:14 -0700, Joe Perches wrote:
>> On Mon, 2016-08-15 at 23:04 +0200, Greg Kroah-Hartman wrote:
>>> On Mon, Aug 15, 2016 at 12:33:23PM -0700, Joe Perches wrote:
>>>> Start to rationalize include paths in source code files.
>> []
>>>> diff --git a/drivers/staging/lustre/Makefile b/drivers/staging/lustre/Makefile
>> []
>>>> @@ -1,2 +1,5 @@
>>>> +subdir-ccflags-y += -I$(srctree)/drivers/staging/lustre/include/
>>>> +subdir-ccflags-y += -I$(srctree)/drivers/staging/lustre/lustre/include/
>>>> +
>>>>  obj-$(CONFIG_LNET)		+= lnet/
>>>>  obj-$(CONFIG_LUSTRE_FS)		+= lustre/
>>> This is good, but does this break the subdir make command:
>>> 	make M=drivers/staging/lustre/foo_dir/
>>> ?
>> hmm, yeah, it does.  Oh well, nevermind for awhile.
>>> I remember the last time I tried to clean this up, it took a while...
>> It seems like something the build tools should
>> handle correctly now, but I'll look at it.
> 
> Perhaps making a specific directory should also walk up
> any parent directory Makefiles looking for subdir flags.
> 
> Is that unreasonable?  Any suggestions?

I suggest to do make drivers/staging/lustre/. If building the lustre
subdirectories is going to be a common use case, then you can propagate
the subdir-ccflags-y assignment down to the individual Makefiles.

Michal