Messages in this thread | | | Date | 15 Nov 2002 20:26:00 +0200 | From | (Kai Henningsen) | Subject | Re: module mess in -CURRENT |
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ak@suse.de (Andi Kleen) wrote on 15.11.02 in <20021115043827.A20764@wotan.suse.de>:
> > and then have the timer clear "xtime_count" every time it updates it. > > Problem is that you cannot easily synchronize such a monotonously increasing > timer in a network. But make needs synchronized times.
That's really a make problem. It gets much worse when you count in times going backwards because you restore a file from backup, or whatever.
What I'd really like make to do - but it can't with the current design - is to note the exact time stamp of each dependency when creating a target, and when reconsidering that target, finding out if any of those time stamps have changed in any way (and, while we're at it, probably check the size as well). *Changed since last time*, not younger than the target.
But of course to do that, you need a persistent repository for those time stamps - which, I think, kbuild-Owen does.
If you think about the more tricky things to do with make, this is almost always what you would need to make a solution much easier.
Take network time shift, for example. Once you no longer need a younger- older relation, that time shift is actually completely irrelevant!
One of these days, when I have lots of time (as if!) ...
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