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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: Creating Convenience Libraries with libtool</TITLE><META NAME="description" CONTENT="Autoconf, Automake, and Libtool: Creating Convenience Libraries with libtool"><META NAME="keywords" CONTENT="Autoconf, Automake, and Libtool: Creating Convenience Libraries with 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; 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Modern compilers are able to create<EM>partially linked</EM> objects: intermediate compilation units whichcomprise several compiled objects, but are neither an executable or alibrary. Such partially linked objects must be subsequently linkedinto a library or executable to be useful. Libtool conveniencelibraries <EM>are</EM> partially linked objects, but are emulated by<CODE>libtool</CODE> on platforms with no native implementation.</P><P><BLOCKQUOTE>If you want to try this to see what <CODE>libtool</CODE> does on yourmachine, put the following code in a file <TT>`trim.c'</TT>, in the samedirectory as <TT>`hello.c'</TT> and <TT>`libhello.la'</TT>, and run the exampleshell commands from there:<P><TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre></FONT></pre></td></tr></table></BLOCKQUOTE><P>To compile the convenience library with <CODE>libtool</CODE>, you would dothis:</P><P><TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre>$ libtool gcc -c trim.crm -f .libs/trim.logcc -c -fPIC -DPIC trim.c -o .libs/trim.logcc -c trim.c -o trim.o >/dev/null 2>&1mv -f .libs/trim.lo trim.lo$ libtool gcc -o libtrim.la trim.lorm -fr .libs/libtrim.la .libs/libtrim.* .libs/libtrim.*ar cru .libs/libtrim.al trim.loranlib .libs/libtrim.alcreating libtrim.la(cd .libs && rm -f libtrim.la && ln -s ../libtrim.la libtrim.la)</FONT></pre></td></tr></table></P><P>Additionally, you can use a convenience library as an alias for a set ofzero or more object files and some dependent libraries. If you need tolink several objects against a long list of libraries, it is much moreconvenient to create an alias:</P><P><TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre>$ libtool gcc -o libgraphics.la -lpng -ltiff -ljpeg -lzrm -fr .libs/libgraphics.la .libs/libgraphics.* .libs/libgraphics.*ar cru .libs/libgraphics.alranlib .libs/libgraphics.alcreating libgraphics.la(cd .libs && rm -f libgraphics.la && \ln -s ../libgraphics.la libgraphics.la)</FONT></pre></td></tr></table></P><P>Having done this, whenever you link against <TT>`libgraphics.la'</TT> with<CODE>libtool</CODE>, all of the dependent libraries will be linked too.In this case, there are no actual objects compiled into the conveniencelibrary, but you can do that too, if need be.</P><P><A NAME="Linking an Executable"></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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