linux-kernel - Re: [PATCH v2] tags: honor COMPILED_SOURCE with apart output directory

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Message-ID: <87h911yw1t.fsf@belgarion.home>
Date:   Thu, 04 May 2017 08:29:18 +0200
From:   Robert Jarzmik <robert.jarzmik@...e.fr>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Michal Marek <mmarek@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v2] tags: honor COMPILED_SOURCE with apart output directory

Masahiro Yamada <yamada.masahiro@...ionext.com> writes:

> Hi Robert,
>
> 2017-04-26 5:07 GMT+09:00 Robert Jarzmik <robert.jarzmik@...e.fr>:
>> Masahiro Yamada <yamada.masahiro@...ionext.com> writes:
>>
>>> Hi Robert,
>>>> diff --git a/scripts/tags.sh b/scripts/tags.sh
>>>> index a2ff3388e5ea..35cb64d5211c 100755
>>>> --- a/scripts/tags.sh
>>>> +++ b/scripts/tags.sh
>>>> @@ -106,7 +106,8 @@ all_compiled_sources()
>>>>                 case "$i" in
>>>>                         *.[cS])
>>>>                                 j=${i/\.[cS]/\.o}
>>>> -                               if [ -e $j ]; then
>>>> +                               k="${j#$tree}"
>>>> +                               if [ -e $j -o -e "$k" ]; then
>>>
>>>
>>> Do we need to check both srctree and objtree?
>>> I think checking objtree (after $tree is ripped off) is enough.
>>
>> If I remember correctly, as this goes back a couple of monthes when I made the
>> tests of this patch, the srctree is checked for the case when the kernel is
>> compiled without O=, and objtree for the case with O=.
>
>
> I thought of this too, but if O= is given, objects in srctree
> should not be checked.
>
> For example, the kernel may be compiled for ARCH=arm with O= first,
> then for ARCH=x86 without O= second.
>
> If we include objects from both trees, the generated tag file
> will be a mixture of arm and x86.
That's true, but is this case worth an additional test for this case, ie. is it
a case anybody uses ? Given that that this tags generation never worked for out
of tree builds, I was thinking it wasn't worth a :
   [[ (-z $O -a -e $j) || (-n $O -a -e $k) ]];

Cheers.

-- 
Robert