linux-kernel - Re: Bug 116131: tools/perf and O= fails to build

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Date:	Mon, 11 Apr 2016 09:35:17 +0100
From:	TJ <linux@....tj>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: Bug 116131: tools/perf and O= fails to build

On 11-04-2016 08:40, Andy Shevchenko wrote:
> On Mon, Apr 11, 2016 at 12:36 AM, TJ <linux@....tj> wrote:
>> Trying to do an out-of-tree build using either absolute or relative 
>> paths
>> for O= fails when trying to build tools/perf.
> 
> Create directory manually.
> acme@ pointed me out to some commit where it's done on purpose.

It's trying to use *the wrong* directory path entirely.

It looks to be caused by the sub-make calls that pass O=$(OUTPUT) 
because OUTPUT has been set to $(O)+subdir.

Then, in the sub-make tools/scripts/Makefile.include is called *again* 
and does the same $(O)+subdir resulting in basedir+subdir+subdir.