linux-kernel - Re: [PATCH Kbuild] Call only one make with all targets for O=

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Message-ID: <20070928192434.GA10769@uranus.ravnborg.org>
Date:	Fri, 28 Sep 2007 21:24:34 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Milton Miller <miltonm@....com>
Cc:	Kai Germaschewski <kai@...maschewski.name>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH Kbuild] Call only one make with all targets for O=

On Fri, Sep 21, 2007 at 06:09:02PM -0500, Milton Miller wrote:
> Change the invocations of make in the output directory Makefile and the
> main Makefile for seperate object trees to pass all goals to one $(MAKE)
> via a new phony target "sub-make" and the existing target _all.
> 
> When compiling with seperate object directories, a seperate make is called
> in the context of another directory (from the output directory the main
> Makefile is called, the Makefile is then restarted with current directory
> set to the object tree).  Before this patch, when multiple make command
> goals are specified, each target results in a seperate make invocation.
> With make -j, these invocations may run in parallel, resulting in multiple
> commands running in the same directory clobbering each others results.
> 
> I did not try to address make -j for mixed dot-config and no-dot-config
> targets.  Because the order does matter, a solution was not obvious.
> Perhaps a simple check for MAKEFLAGS having -j and refusing to run would
> be approprate.

Applied to kbuild.git.

This was a nice one to get ruined out.
Thanks Milton,

	Sam
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