codeblocks-ep/help/html/programmerHelp/make/Pattern-Rules.html at master · maifeeulasad/codeblocks-ep · GitHub

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Node:<a name="Pattern%20Rules">Pattern Rules</a>,
Next:<a rel="next" accesskey="n" href="Last-Resort.html#Last%20Resort">Last Resort</a>,
Previous:<a rel="previous" accesskey="p" href="Chained-Rules.html#Chained%20Rules">Chained Rules</a>,
Up:<a rel="up" accesskey="u" href="Implicit-Rules.html#Implicit%20Rules">Implicit Rules</a>
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<h3 class="section">Defining and Redefining Pattern Rules</h3>

   <p>You define an implicit rule by writing a <dfn>pattern rule</dfn>.  A pattern
rule looks like an ordinary rule, except that its target contains the
character <code>%</code> (exactly one of them).  The target is considered a
pattern for matching file names; the <code>%</code> can match any nonempty
substring, while other characters match only themselves.  The prerequisites
likewise use <code>%</code> to show how their names relate to the target name.

   <p>Thus, a pattern rule <code>%.o : %.c</code> says how to make any file
<code></code><var>stem</var><code>.o</code> from another file <code></code><var>stem</var><code>.c</code>.

   <p>Note that expansion using <code>%</code> in pattern rules occurs
<strong>after</strong> any variable or function expansions, which take place
when the makefile is read.  See <a href="Using-Variables.html#Using%20Variables">How to Use Variables</a>, and <a href="Functions.html#Functions">Functions for Transforming Text</a>.

<ul class="menu">
<li><a accesskey="1" href="Pattern-Intro.html#Pattern%20Intro">Pattern Intro</a>:                An introduction to pattern rules.
<li><a accesskey="2" href="Pattern-Examples.html#Pattern%20Examples">Pattern Examples</a>:             Examples of pattern rules.
<li><a accesskey="3" href="Automatic.html#Automatic">Automatic</a>:                    How to use automatic variables in the
                                  commands of implicit rules.
<li><a accesskey="4" href="Pattern-Match.html#Pattern%20Match">Pattern Match</a>:                How patterns match.
<li><a accesskey="5" href="Match-Anything-Rules.html#Match-Anything%20Rules">Match-Anything Rules</a>:         Precautions you should take prior to
                                  defining rules that can match any
                                  target file whatever.
<li><a accesskey="6" href="Canceling-Rules.html#Canceling%20Rules">Canceling Rules</a>:              How to override or cancel built-in rules.
</ul>

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