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<h1 class="subsection">Directory Search and Implicit Rules</h1> <p>The search through the directories specified in <code>VPATH</code> or with <code>vpath</code> also happens during consideration of implicit rules (see <a href="implicit-rules">Using Implicit Rules</a>). </p> <p>For example, when a file <samp>foo.o</samp> has no explicit rule, <code>make</code> considers implicit rules, such as the built-in rule to compile <samp>foo.c</samp> if that file exists. If such a file is lacking in the current directory, the appropriate directories are searched for it. If <samp>foo.c</samp> exists (or is mentioned in the makefile) in any of the directories, the implicit rule for C compilation is applied. </p> <p>The recipes of implicit rules normally use automatic variables as a matter of necessity; consequently they will use the file names found by directory search with no extra effort. </p><div class="_attribution">
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Copyright © 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 Free Software Foundation, Inc. <br>Licensed under the GNU Free Documentation License.<br>
<a href="https://www.gnu.org/software/make/manual/html_node/Implicit_002fSearch.html" class="_attribution-link">https://www.gnu.org/software/make/manual/html_node/Implicit_002fSearch.html</a>
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