linux-kernel - Re: [PATCH] kbuild: create a build directory automatically for out-of-tree build

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Date:	Tue, 08 Apr 2014 17:19:52 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Randy Dunlap <rdunlap@...radead.org>
CC:	Sam Ravnborg <sam@...nborg.org>,
	Masahiro Yamada <yamada.m@...panasonic.com>,
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] kbuild: create a build directory automatically for out-of-tree
 build

On 2014-04-01 19:44, Randy Dunlap wrote:
> On 03/31/2014 01:36 PM, Sam Ravnborg wrote:
>> In the past I have rejected such patches - but today I fail to recall why.
> 
> I believe that it was due this kind of patch allowing typos to cause
> builds that one does not want to make.
> 
> E.g., if I already have O=OUT1 directory and I mistype O=OUT2, this will cause
> a full build (potentially) in OUT2, even if it should do a small rebuild in
> OUT1 instead.

I thought about this possibility before applying the patch. But if this
happens, then a build in the mistyped directory will immediately fail
due to lack of .config.

Michal

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