Re: How to modify algorithm that determines weather a target needs rebuild

[Paul Smith]

On Mon, 2010-08-09 at 14:46 -0600, Bob Proulx wrote:
> This sounds like the X part of the X-Y problem.  Why will the
> timestamp of the file be changing back and forth?
> 
> Is this because you have two competing builds running in the same
> directory with one doing it one way and the other doing it another
> way?

Another likely candidate is source code control tools.  Some tools
(ClearCase is the obvious one) will do this when you change what version
of code you are looking at in your view.

That's one primary reason why ClearCase comes with its own build tool
(clearmake), precisely to manage this situation.  Clearmake has a GNU
make emulation mode, although last time I checked (3-4 years ago) it was
missing significant GNU make features still.

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