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<HTML><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><!-- Created on September, 12 2004 by texi2html 1.64 --><!-- Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author) Karl Berry <karl@freefriends.org> Olaf Bachmann <obachman@mathematik.uni-kl.de> and many others.Maintained by: Olaf Bachmann <obachman@mathematik.uni-kl.de>Send bugs and suggestions to <texi2html@mathematik.uni-kl.de> --><HEAD><TITLE>Autoconf, Automake, and Libtool: First Configure Programs</TITLE><META NAME="description" CONTENT="Autoconf, Automake, and Libtool: First Configure Programs"><META NAME="keywords" CONTENT="Autoconf, Automake, and Libtool: First Configure Programs"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META NAME="Generator" CONTENT="texi2html 1.64"><script language="Javascript"><!-- // Check the browser version. function checkVersion() { if (navigator.appVersion.charAt(0)>=3) return true; if (navigator.appVersion.charAt(0)>=4) return true; 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Richard Pixley, and theoriginal GCC <TT>`configure'</TT> script, by Richard Stallman. Theseare quite similar, and the developers communicated regularly. GCCis the GNU Compiler Collection, formerly the GNU C compiler.<LI>The GNU Autoconf package, by David MacKenzie.<LI>Imake, part of the X Window system.</UL><P>These systems all split building a program into two steps: aconfiguration step, and a build step. For all the systems, the buildstep used the standard Unix <CODE>make</CODE> program. The <CODE>make</CODE>program reads a set of rules in a <TT>`Makefile'</TT>, and uses them tobuild a program. The configuration step would generate<TT>`Makefile'</TT>s, and perhaps other files, which would then be usedduring the build step.</P><P>Metaconfig and Autoconf both use feature tests todetermine the capabilities of the system. They use Bourne shell scripts(all variants of Unix support the Bourne shell in one form or another)to run various tests to see what the system can support.</P><P>The Cygnus <TT>`configure'</TT> script and the original GCC<TT>`configure'</TT> script are also Bourne shell scripts. They rely onlittle configuration files for each system variant, both header filesand <TT>`Makefile'</TT> fragments. In early versions, the user compilingthe program had to tell the script which type of system the programshould be built for; they were later enhanced with a shell scriptwritten by Per Bothner which determines the system type based on thestandard Unix <CODE>uname</CODE> program and other information.</P><P>Imake is a portable C program. Imake can becustomized for a particular system, and run as part of building apackage. However, it is more normally distributed with a package,including all the configuration information needed for supportedsystems.</P><P>Metaconfig and Autoconf are programs used by programauthors. They produce a shell script which is distributed with theprogram's source code. A user who wants to build the program runs theshell script in order to configure the source code for the particularsystem on which it is to be built.</P><P>The Cygnus and GCC <TT>`configure'</TT> scripts, and <CODE>imake</CODE>,do not have this clear distinction between use by the developer and useby the user.</P><P>The Cygnus and GCC <TT>`configure'</TT> scripts included features tosupport cross development, both to support building a cross-compilerwhich compiles code to be run on another system, and to support buildinga program using a cross-compiler.</P><P>Autoconf, Metaconfig and Imake did nothave these features (they were later added to Autoconf); theyonly worked for building a program on the system on which it was to run.</P><P>The scripts generated by Metaconfig are interactive bydefault: they ask questions of the user as they go along. This permitsthem to determine certain characteristics of the system which it isdifficult or impossible to test, such as the behavior of setuidprograms.</P><P>The Cygnus and GCC <TT>`configure'</TT> scripts, and the scriptsgenerated by <CODE>autoconf</CODE>, and the <CODE>imake</CODE> program, arenot interactive: they determine everything themselves. When usingAutoconf, the package developer normally writes the script to acceptcommand line options for features which can not be tested for, orsometimes requires the user to edit a header file after the<TT>`configure'</TT> script has run.</P><P><A NAME="Configure Development"></A></TR></TABLE><BR> <FONT SIZE="-1">This document was generatedby <I>Gary V. Vaughan</I> on <I>September, 12 2004</I>using <A HREF="http://www.mathematik.uni-kl.de/~obachman/Texi2html"><I>texi2html</I></A></BODY></HTML>⌨️ 快捷键说明
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