On Thu, Sep 03, 2015 at 06:54:05PM +0200, Jacek Caban wrote:
Hi Marcus,
On 09/03/15 13:07, Marcus Meissner wrote:
From d8df64a7261bc0febcdd48d4ed818dc1f36f3471 Mon Sep 17 00:00:00 2001 From: Marcus Meissner meissner@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.
I thought about this and it seems not easily solvable.
One dependency which could be avoided is tools/widl which due to config.h inclusion is rebuilt on reconfigure. Of course this would be hoping that the output of widl is stable.
So yeah, not really possible.
Ciao, Marcus