codeblocks-ep/help/html/programmerHelp/make/Implicit-Search.html at master · maifeeulasad/codeblocks-ep · GitHub

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<title>GNU `make'</title>
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Node:<a name="Implicit%2fSearch">Implicit/Search</a>,
Next:<a rel="next" accesskey="n" href="Libraries-Search.html#Libraries%2fSearch">Libraries/Search</a>,
Previous:<a rel="previous" accesskey="p" href="Commands-Search.html#Commands%2fSearch">Commands/Search</a>,
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<h4 class="subsection">Directory Search and Implicit Rules</h4>

   <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.html#Implicit%20Rules">Using Implicit Rules</a>).

   <p>For example, when a file <code>foo.o</code> has no explicit rule, <code>make</code>
considers implicit rules, such as the built-in rule to compile
<code>foo.c</code> if that file exists.  If such a file is lacking in the
current directory, the appropriate directories are searched for it.  If
<code>foo.c</code> exists (or is mentioned in the makefile) in any of the
directories, the implicit rule for C compilation is applied.

   <p>The commands 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.

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