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[bug #20394] vpath directive drops entries

From: Paul D. Smith
Subject: [bug #20394] vpath directive drops entries
Date: Thu, 12 Jul 2007 07:57:49 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20061201 Firefox/ (Ubuntu-feisty)

Follow-up Comment #6, bug #20394 (project make):

I haven't looked into it carefully, but it's not immediately clear to me that
it's a simple thing to avoid the directory cache for chained/intermediate
rules, vs. any other kind of rule.

The disadvantage with the "is_stale" boolean is that every time something
goes stale you have to walk through the entire cache and reset all the
boolean values.

If you use a counter then you don't have to touch anything in the cache until
and unless you need to look at that cached data, then you compare (and update)
the counter kept with that set of data.

It may be that our caches are not large enough to make a difference,
practically speaking; I'm not sure.


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