linux-kernel - Re: kbuild: support of new KBUILD_FULL

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Message-ID: <53A2E22F.6060100@suse.cz>
Date:	Thu, 19 Jun 2014 15:14:23 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Boaz Harrosh <boaz@...xistor.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: kbuild: support of new KBUILD_FULL_PATH

Dne 19.6.2014 14:01, Boaz Harrosh napsal(a):
> On 06/19/2014 01:41 PM, Michal Marek wrote:
>>> Signed-off-by: Boaz Harrosh <boaz@...xistor.com>
>>> -        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
>>> +        # if KBUILD_FULL_PATH is not empty then condition will fail
>>> +        ifeq ($(KBUILD_FULL_PATH)$(KBUILD_SRC)/,$(dir $(CURDIR)))
>>
>> This is an ugly way to express the logic.
>>
> 
> I kind of agree. My Makefile foo is not very strong any other way I
> know would duplicate code. What would you suggest?
> 
> [ Best I can think of is:
> 
>         srctree := $(KBUILD_SRC)
> 
>         # if KBUILD_FULL_PATH=1 then do not use relative path
> 	ifneq ($(KBUILD_FULL_PATH), 1)
>                 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
>                         # building in a subdirectory of the source tree
>                         srctree := ..
>                 endif
>         endif
> 
> 
> Is this better?

Definitely.


>> How about generated sources like asm-offsets.s or the lexer and parser
>> in scripts/kconfig, does kdevelop figure out where the files live? If
>> not, you might need to add
>>
>> -objtree                := .
>> +ifeq ($(KBUILD_FULL_PATH),1)
>> +       objtree := $(CURDIR)
>> +else
>> +        objtree        := .
>> +endif
>>
>> to use the full path also for the O= directory.
>>
> 
> I would not care for those at all. The important is those files that
> you need to point and edit to fix stuff. The generated files I better
> not edit usually. The edit is in some other place, right?

Fair enough.


> I saw that this patch caused other breakage as well. Will you be
> fixing those? Do you want to own this or you still need a ver2
> of this patch?

I already sent three fixes to Linus:
https://lkml.org/lkml/2014/6/18/664. There is one more brekage that
Alexei is seeing with deb-pkg, but this needs further investigation.
Anyway, either send a v2 or tell me and I will fold the above change to
the first version of your patch.

Michal
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