PATCH: widl: implement move-if-changed logic

[Jacek Caban]

Hi Marcus,

On 09/03/15 13:07, Marcus Meissner wrote:
> From d8df64a7261bc0febcdd48d4ed818dc1f36f3471 Mon Sep 17 00:00:00 2001
> From: Marcus Meissner <meissner at suse.de>
> Date: Thu, 3 Sep 2015 12:11:13 +0200
> Subject: [PATCH] widl: implement a move-if-changed logic
>
> This avoids unnecessary rebuilds if the generated code by widl
> does not change.

While I like the idea and it would often save a bug chunk of build time,
I don't think it would work well with make. If you don't touch output
file, then following make invocation will execute widl again, which is
undesired.

Thanks,
Jacek