linux-kernel - Re: [PATCH 1/2] bootconfig: Support O=<builddir> option

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Date:   Thu, 5 Mar 2020 10:51:23 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 1/2] bootconfig: Support O=<builddir> option

On 3/4/20 11:41 PM, Geert Uytterhoeven wrote:
> Hi Randy,
> 
> On Thu, Mar 5, 2020 at 5:53 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>> On 3/4/20 7:17 PM, Steven Rostedt wrote:
>>> On Wed, 4 Mar 2020 15:04:43 -0800
>>> Randy Dunlap <rdunlap@...radead.org> wrote:
>>>
>>>> On 3/3/20 3:24 AM, Masami Hiramatsu wrote:
>>>>> Support O=<builddir> option to build bootconfig tool in
>>>>> the other directory. As same as other tools, if you specify
>>>>> O=<builddir>, bootconfig command is build under <builddir>.
>>>>
>>>> Hm.  If I use
>>>> $ make O=~/tmp -C tools/bootconfig
>>>>
>>>> that works: it builds bootconfig in ~/tmp.
>>>>
>>>> OTOH, if I sit at the top of the kernel source tree
>>>> and I enter
>>>> $ mkdir builddir
>>>> $ make O=builddir -C tools/bootconfig
>>>>
>>>> I get this:
>>>> make: Entering directory '/home/rdunlap/lnx/next/linux-next-20200304/tools/bootconfig'
>>>> ../scripts/Makefile.include:4: *** O=builddir does not exist.  Stop.
>>>> make: Leaving directory '/home/rdunlap/lnx/next/linux-next-20200304/tools/bootconfig'
>>>>
>>>> so it looks like tools/scripts/Makefile.include doesn't handle this case correctly
>>>> (which is how I do all of my builds).
>>>>
>>>
>>> Do you build perf that way?
>>
>> No.  It should also be fixed.
> 
> There are lots of issues when (cross)building the tools and selftest with O=.
> I tried to fix some of them a while ago, but I lost interest.
> https://lore.kernel.org/lkml/20190114135144.26096-1-geert+renesas@glider.be/
> 
> The only thing you can rely on when (cross)building with O=, is the kernel
> itself ;-)

Yeah, oh well.  I'm not ready to just give up on it though.

thanks.

-- 
~Randy