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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN"><!-- This collection of hypertext pages is Copyright 1995-2005 by Steve Summit. --><!-- Content from the book "C Programming FAQs: Frequently Asked Questions" --><!-- (Addison-Wesley, 1995, ISBN 0-201-84519-9) is made available here by --><!-- permission of the author and the publisher as a service to the community. --><!-- It is intended to complement the use of the published text --><!-- and is protected by international copyright laws. --><!-- The on-line content may be accessed freely for personal use --><!-- but may not be published or retransmitted without explicit permission. --><!-- --><!-- this page built Sat Dec 24 21:47:46 2005 by faqproc version 2.7 --><!-- from source file cpp.sgml dated Wed Dec 21 13:52:14 2005 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/cpp/cppsearchpath.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:54 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 10.8b</title><link href="inclkinds.html" rev=precedes><link href="headerglom.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="inclkinds.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="headerglom.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../index-2.html"><img src="../images/buttontop.gif" alt="top/contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><hr><p><!-- qbegin --><h1>comp.lang.c FAQ list<font color=blue>·</font><!-- qtag -->Question 10.8b</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>What are the complete rules for header file searching?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>The exact behavior is implementation-defined(which means that it is supposed to be documented;see question <a href="../ansi/undef.html">11.33</a>).Typically, headersnamed with <TT><></TT>syntaxare searched forin one or more standard places.<a href="bihdr.html" rel=subdocument>[footnote]</a>Header files named with <TT>""</TT>syntaxarefirst searched forin the ``current directory,''then(if not found)in the same standard places.(This last rule,that<TT>""</TT> filesare additionally searchedfor as if they were <TT><></TT> files,istheonly rulespecified by the Standard.)</p><p>Another distinction is the definition of ``current directory''for <TT>""</TT> files.Traditionally(especially under Unix compilers),the current directory istaken to bethe directorycontaining the filecontainingthe <TT>#include</TT> directive.Under other compilers, however,the current directoryis the directory in which the compiler was initially invoked.(Compilers running on systems without directoriesorwithoutthe notion of a current directorymay of course use still different rules.)</p><p>It is also common for there to be a way(usually a command line option involving capital I,or maybe an environment variable)toadd additional directoriesto the list of standard places tosearch.Check yourcompilerdocumentation.</p><p>Additional links:<br><br><a href="include.dmr.html">further elaboration by Dennis Ritchie</a><br><br>A<a href="incl.970605.html">long article</a>of mine exploring some of the bore subtle implications of the search rules</p><p>References:K&R2 Sec. A12.4 p. 231<br>ISO Sec. 6.8.2<br>H&S Sec. 3.4 p. 55<br></p><!-- aend --><p><hr><a href="inclkinds.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="headerglom.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../questions.html"><img src="../images/buttontop.gif" alt="contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><br><!-- lastfooter --><a href="../about.html">about this FAQ list</a> <a href="../eskimo.html">about eskimo</a> <a href="../search.html">search</a> <a href="../feedback.html">feedback</a> <a href="copyright.html">copyright</a><p>Hosted by<a href="http://www.eskimo.com/"><img src="../../www.eskimo.com/img/link/eskitiny.gif" alt="Eskimo North"></a></body><!-- Mirrored from c-faq.com/cpp/cppsearchpath.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:54 GMT --></html>⌨️ 快捷键说明
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