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Re: GNU make to consider files checksum

From: Philip Guenther
Subject: Re: GNU make to consider files checksum
Date: Mon, 28 Sep 2009 15:00:53 -0700

On Mon, Sep 28, 2009 at 11:05 AM, Giuseppe Scrivano <address@hidden> wrote:
> it looks like a good idea.  Do you think it worths to be discussed with
> automake hackers?

I'm not actually convinced that this checksumming is a good idea,
mainly because I'm not convinced this is enough of a problem.  The
point of my message was just that this problem *can* be solved at the
makefile level.  Attacking it by changing automake sounds practical
and probably a faster way to a solution, though I would prefer it to
be optional even there.

(Have you measured how often this sort of thing would save
recompilation and/or relinking and how much time it would save then?
What's the comparison to how much time would be spent calculating the
checksums?  If it saves a minute once every 100 compiles but costs a
second in each of those, then it's a net loss...)

Philip Guenther

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