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Content-based dependencies

From: Yang Zhang
Subject: Content-based dependencies
Date: Wed, 06 May 2009 00:05:12 -0400
User-agent: Thunderbird (X11/20090318)

Is there a way to have GNU make cache copies of source files, so that when rules are triggered by timestamp comparisons between targets and sources, it will also compare the current source with the cached source to make sure that it actually changed before executing the actions (only executing if they differ)?
Yang Zhang

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