linux-kernel - Re: [PATCH] Kbuild: Avoid DTB rebuilds if source files are untouched

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Message-ID: <51642158.3070205@synopsys.com>
Date:	Tue, 9 Apr 2013 19:40:32 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Michal Marek <mmarek@...e.cz>,
	Stephen Warren <swarren@...dia.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	<linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH] Kbuild: Avoid DTB rebuilds if source files are untouched

On 04/04/2013 11:06 PM, Stephen Warren wrote:

> +.SECONDARY: $(obj)/%.dtb.S
> +
>  $(obj)/%.dtb.S: $(obj)/%.dtb
>         $(call cmd,dt_S_dtb)
> 
> and no longer see make rm'ing the .dtb.S file. So, the .SECONDARY is
> behaving as expected, and should fix your problem.

Interestingly, if I make the file name explicit, .SECONDARY works for me too.

.SECONDARY: $(obj)/angel4.dtb.S

http://stackoverflow.com/questions/5426934/why-this-makefile-removes-my-goal

Is this a make bug or is it related to when the rule is parsed by make !

-Vineet
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