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Subject: Re: [PATCH] ppc64: Implement a vDSO and use it for signal
	trampoline
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: Andrew Morton <akpm@osdl.org>, linuxppc64-dev <linuxppc64-dev@ozlabs.org>,
       Linux Kernel list <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@osdl.org>
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Date: Tue, 01 Feb 2005 16:55:01 +1100
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> Right hand side is evaluated only when left hand side is used.
> Also very usefull. Example just mocked up:
> cmd_vdso32_cc = $(CC) -T $^ -o $@
> 
> Doing late evaluation will cause correct replacement of $^ and $@ when
> used. When cmd_vdso_32 is defined make does not know the desired values
> for $^ and $@ - this is only known when cmd_vdso_32 is actually used.
> 
> Hope this clarifies it.

Definitely, thanks.

Ben.