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<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright © 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below). A copy of the license isincluded in the section entitled "GNU Free Documentation License". <p>(a) The FSF's Front-Cover Text is: <p>A GNU Manual <p>(b) The FSF's Back-Cover Text is: <p>You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller }--></style></head><body><div class="node"><p>Node: <a name="Fixed%20Headers">Fixed Headers</a>,Next: <a rel="next" accesskey="n" href="Standard-Libraries.html#Standard%20Libraries">Standard Libraries</a>,Previous: <a rel="previous" accesskey="p" href="Incompatibilities.html#Incompatibilities">Incompatibilities</a>,Up: <a rel="up" accesskey="u" href="Trouble.html#Trouble">Trouble</a><hr><br></div><h3 class="section">Fixed Header Files</h3><p>GCC needs to install corrected versions of some system header files. This is because most target systems have some header files that won'twork with GCC unless they are changed. Some have bugs, some areincompatible with ISO C, and some depend on special features of othercompilers. <p>Installing GCC automatically creates and installs the fixed headerfiles, by running a program called <code>fixincludes</code> (or for certaintargets an alternative such as <code>fixinc.svr4</code>). Normally, youdon't need to pay attention to this. But there are cases where itdoesn't do the right thing automatically. <ul><li>If you update the system's header files, such as by installing a newsystem version, the fixed header files of GCC are not automaticallyupdated. The easiest way to update them is to reinstall GCC. (Ifyou want to be clever, look in the makefile and you can find ashortcut.) <li>On some systems, in particular SunOS 4, header file directories containmachine-specific symbolic links in certain places. This makes itpossible to share most of the header files among hosts running thesame version of SunOS 4 on different machine models. <p>The programs that fix the header files do not understand this specialway of using symbolic links; therefore, the directory of fixed headerfiles is good only for the machine model used to build it. <p>In SunOS 4, only programs that look inside the kernel will notice thedifference between machine models. Therefore, for most purposes, youneed not be concerned about this. <p>It is possible to make separate sets of fixed header files for thedifferent machine models, and arrange a structure of symbolic links soas to use the proper set, but you'll have to do this by hand. </p><li>On Lynxos, GCC by default does not fix the header files. This isbecause bugs in the shell cause the <code>fixincludes</code> script to fail. <p>This means you will encounter problems due to bugs in the system headerfiles. It may be no comfort that they aren't GCC's fault, but itdoes mean that there's nothing for us to do about them. </ul> </body></html>⌨️ 快捷键说明
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