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    <pre><code>make -d </code></pre> <p>should give you <em>more</em> than enough information to debug your makefile.</p> <p>Be warned: it will take some time and effort to analyze the output but loading the output into your favorite editor and doing searches will assist a lot.</p> <p>You can greatly reduce the amount of debugging output if you specify the specific target you're interested in. So if you're only interested in the <code>dodgy</code> target, instead of just <code>make -d</code> which may make a hundred different things, try:</p> <pre><code>make clean make -d dodgy </code></pre> <p>(assuming you have a <code>clean</code> target of course).</p> <p>The <code>make --debug</code> is identical to <code>make -d</code> but you can also specify:</p> <pre><code>make --debug=FLAGS </code></pre> <p>where flags can be:</p> <ul> <li><code>a</code> for all debugging (same as <code>make -d</code> and <code>make --debug</code>).</li> <li><code>b</code> for basic debugging.</li> <li><code>v</code> for slightly more verbose basic debugging.</li> <li><code>i</code> for implicit rules.</li> <li><code>j</code> for invocation information.</li> <li><code>m</code> for information during makefile remakes.</li> </ul> <p>It looks like <code>make --debug=b</code> is the best option for what you need, as shown in the following transcript:</p> <pre><code>pax@paxbox&gt; cat makefile c:a b touch c pax@paxbox&gt; touch a b ; make touch c pax@paxbox&gt; make make: 'c' is up to date. pax@paxbox&gt; touch a ; make --debug=b GNU Make 3.81 Copyright (C) 2006 Free Software Foundation, Inc. Blah, blah, blah. Reading makefiles... Updating goal targets.... Prerequisite 'a' is newer than target 'c'. Must remake target 'c'. touch c Successfully remade target file 'c'. </code></pre>
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    1. COAnother suggestion that if you want to get rid of built-in implicit rules, you may use `-r` flag alongside mere `-d`.
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