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    <p>If you are on a platform that supports <a href="http://linux.die.net/man/1/inotifywait" rel="nofollow noreferrer"><code>inotifywait</code></a> (to my knowledge, only Linux; but since you asked about Make, it seems there's a good chance you're on Linux; for OS X, see <a href="https://stackoverflow.com/q/1515730/834176">this question</a>), you can do something like this:</p> <pre><code>inotifywait --exclude '.*\.swp|.*\.o|.*~' --event MODIFY -q -m -r . | while read do make done </code></pre> <p>Breaking that down:</p> <pre><code>inotifywait </code></pre> <p>Listen for file system events.</p> <pre><code>--exclude '.*\.swp|.*\.o|.*~' </code></pre> <p>Exclude files that end in <code>.swp</code>, <code>.o</code> or <code>~</code> (you'll probably want to add to this list).</p> <pre><code>--event MODIFY </code></pre> <p>When you find one print out the filepath of the file for which the event occurred.</p> <pre><code>-q </code></pre> <p>Do not print startup messages (so make is not prematurely invoked).</p> <pre><code>-m </code></pre> <p>Listen continuously.</p> <pre><code>-r . </code></pre> <p>Listen recursively on the current directory. Then it is piped into a simple loop which invokes make for every line read.</p> <p>Tailor it to your needs. You may find <code>inotifywait --help</code> and the manpage helpful.</p> <hr> <p>Here is a more detailed script. I haven't tested it much, so use with discernment. It is meant to keep the build from happening again and again needlessly, such as when switching branches in Git.</p> <pre><code>#!/bin/sh datestampFormat="%Y%m%d%H%M%S" lastrun=$(date +$datestampFormat) inotifywait --exclude '.*\.swp|.*\.o|.*~' \ --event MODIFY \ --timefmt $datestampFormat \ --format %T \ -q -m -r . | while read modified; do if [ $modified -gt $lastrun ]; then make lastrun=$(date +$datestampFormat) fi done </code></pre>
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    1. POIs there a "watch" / "monitor" / "guard" program for Makefile dependencies?
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