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Date: Tue, 18 Feb 2014 06:35:41 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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Subject: Re: [PATCH 13/20] Kbuild, lto: Set TMPDIR for LTO v2
References: <1392733738-8290-1-git-send-email-andi@firstfloor.org> <1392733738-8290-14-git-send-email-andi@firstfloor.org>
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To: Andi Kleen <andi@firstfloor.org>, linux-kernel@vger.kernel.org
Cc: sam@ravnborg.org, x86@kernel.org, linux-kbuild@vger.kernel.org, Andi Kleen <ak@linux.intel.com>

On 02/18/2014 06:28 AM, Andi Kleen wrote:
>  
> +ifdef CONFIG_LTO
> +# LTO gcc creates a lot of files in TMPDIR, and with /tmp as tmpfs
> +# it's easy to drive the machine OOM. Use the object directory
> +# instead
> +TMPDIR ?= ${objtree}
> +export TMPDIR
> +endif
> +

We still prefer $(...) in Makefiles, no?

	-hpa