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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: Introducing GNU Libtool</TITLE><META NAME="description" CONTENT="Autoconf, Automake, and Libtool: Introducing GNU Libtool"><META NAME="keywords" CONTENT="Autoconf, Automake, and Libtool: Introducing GNU Libtool"><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; else return false; } if (checkVersion()) { homeon = new Image(); homeon.src = "homeon.png"; homeoff = new Image(); homeoff.src = "home.png"; tocon = new Image(); tocon.src = "tocon.png"; tocoff = new Image(); tocoff.src = "toc.png"; indexon = new Image(); indexon.src = "indexon.png"; indexoff = new Image(); indexoff.src = "index.png"; helpon = new Image(); helpon.src = "helpon.png"; helpoff = new Image(); helpoff.src = "help.png"; backon = new Image(); backon.src = "backon.png"; backoff = new Image(); backoff.src = "back.png"; forwardon = new Image(); forwardon.src = "forwardon.png"; forwardoff = new Image(); forwardoff.src = "forward.png"; prevon = new Image(); prevon.src = "prevon.png"; prevoff = new Image(); prevoff.src = "prev.png"; nexton = new Image(); nexton.src = "nexton.png"; nextoff = new Image(); nextoff.src = "next.png"; upon = new Image(); upon.src = "upon.png"; upoff = new Image(); upoff.src = "up.png"; } function img_act(imgName) { if (checkVersion()) { imgOn = eval(imgName + "on.src"); document [imgName].src = imgOn; } } function img_inact(imgName) { if (checkVersion()) { imgOff = eval(imgName + "off.src"); document [imgName].src = imgOff; } }// --></SCRIPT></HEAD><BODY LANG="EN" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#6688AA" VLINK="#336688" ALINK="#808080"><A NAME="SEC68"></A><TABLE BORDER=0 CELLPADDING=0 CELLSPACING=10><TR VALIGN="TOP"><TD ALIGN="MIDDLE" WIDTH=50 BGCOLOR="#e6e6e6"><TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_67.html#SEC67" onMouseover="img_act('prev')" onMouseout="img_inact('prev')"><IMG SRC="prev.png" BORDER="0" ALT="Back: sic.c & sic.h (again)" ALIGN="MIDDLE" NAME="prev"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_69.html#SEC69" onMouseover="img_act('next')" onMouseout="img_inact('next')"><IMG SRC="next.png" BORDER="0" ALT="Forward: Creating libtool" ALIGN="MIDDLE" NAME="next"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"> <TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_6.html#SEC6" onMouseover="img_act('back')" onMouseout="img_inact('back')"><IMG SRC="back.png" BORDER="0" ALT="FastBack: History" ALIGN="MIDDLE" NAME="back"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook.html#SEC_Top" onMouseover="img_act('up')" onMouseout="img_inact('up')"><IMG SRC="up.png" BORDER="0" ALT="Up: Top" ALIGN="MIDDLE" NAME="up"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_83.html#SEC83" onMouseover="img_act('forward')" onMouseout="img_inact('forward')"><IMG SRC="forward.png" BORDER="0" ALT="FastForward: Using GNU Libtool" ALIGN="MIDDLE" NAME="forward"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook.html#SEC_Top" onMouseover="img_act('home')" onMouseout="img_inact('home')"><IMG SRC="home.png" BORDER="0" ALT="Top: Autoconf, Automake, and Libtool" ALIGN="MIDDLE" NAME="home"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_toc.html#SEC_Contents" onMouseover="img_act('toc')" onMouseout="img_inact('toc')"><IMG SRC="toc.png" BORDER="0" ALT="Contents: Table of Contents" ALIGN="MIDDLE" NAME="toc"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_285.html#SEC285" onMouseover="img_act('index')" onMouseout="img_inact('index')"><IMG SRC="index.png" BORDER="0" ALT="Index: Index" ALIGN="MIDDLE" NAME="index"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_abt.html#SEC_About" onMouseover="img_act('help')" onMouseout="img_inact('help')"><IMG SRC="help.png" BORDER="0" ALT="About: About this document" ALIGN="MIDDLE" NAME="help"></A></TD></TR></TABLE></TD><TD ALIGN="LEFT"><H1> 10. Introducing GNU Libtool </H1><!--docid::SEC68::--><P>Libtool takes care of all the peculiarities of creating, linking andloading shared and static libraries across a great number of platforms,providing a uniform command line interface to the developer. By usingLibtool to manage your project libraries, you only need to concernyourself with <EM>Libtool's</EM> interface: when someone else builds yourproject on a platform with a different library architecture, Libtoolinvokes that platform's compiler and linker with the correct environmentand command line switches. It will install libraries and library usingbinaries according to the conventions of the host platform, and followsthat platform's rules for library versioning and libraryinterdependencies.</P><P><A NAME="IDX3"></A>Libtool empowers you to treat a library as an implementation of a welldefined interface of your choosing. This <EM>Libtool library</EM> may bemanifest as a collection of compiler objects, a static <CODE>ar</CODE>archive, or a position independent runtime loadable object. Bydefinition, native libraries are fully supported by Libtool sincethey are an implementation detail of the Libtool libraryabstraction. It's just that until Libtool achieves complete worlddomination, you might need to bear in mind what is going on behind thecommand line interface when you first add Libtool support to yourproject.</P><P><BLOCKQUOTE><A NAME="IDX4"></A><A NAME="IDX5"></A>The sheer number of uses of the word `library' in this book couldbe easily very confusing. In this chapter and throughout the rest ofthe book, I will refer to various kinds of libraries as follows:<P><DL COMPACT><DT>`native'<DD>Low level libraries, that is, libraries provided by the hostarchitecture.<P><DT>`Libtool library'<DD>The kind of library built by Libtool. This encompasses both theshared and static native components of the implementation of the namedlibrary.<P><DT>`pseudo-library'<DD>The high level <SAMP>`.la'</SAMP> file produced by Libtool. The`pseudo-library' is not a library in its own right, but is treatedas if it were from outside the Libtool interface.</DL><P>Furthermore, in the context of Libtool, there is another subtle (butimportant) distinction to be drawn:</P><P><DL COMPACT><DT>`static <EM>library</EM>'<DD>A Libtool library which has no shared archive component.<P><DT>`static <EM>archive</EM>'<DD>The static component of a Libtool library.</DL></BLOCKQUOTE><P>Many developers use Libtool as a black box which requires adding a fewmacros to <TT>`configure.in'</TT> and tweaking a project's<TT>`Makefile.am'</TT>. The next chapter addresses that school of thought in more detail. In this chapter I will talk a little about the innerworkings of Libtool, and show you how it can be used directly from yourshell prompt -- how to build various kinds of library, and how thoselibraries can be used by an application. Before you can do any of this,you need to create a <CODE>libtool</CODE> script that is tailored to theplatform you are using it from.</P><P><A NAME="Creating libtool"></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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