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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: Installing GNU Autotools on Cygwin</TITLE><META NAME="description" CONTENT="Autoconf, Automake, and Libtool: Installing GNU Autotools on Cygwin"><META NAME="keywords" CONTENT="Autoconf, Automake, and Libtool: Installing GNU Autotools on Cygwin"><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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Building it has never been aproblem as long as GNU M4 and a Bourne Shell are available, it isthe macros themselves which offer this support. Of course, any Autoconfmacros you write yourself must be designed carefully to not make anyassumptions about being executed on Unix if the Cygwin compatibility isto remain. A binary package of Autoconf for Cygwin version 1.1.1 isavailable from the CygUtils website<A NAME="DOCF62" HREF="autobook_fot.html#FOOT62">(62)</A>.</P><P><A NAME="IDX71"></A>Automake joined the fray much later than the Cygwin support code wasadded to Autoconf, and has consequently always supported Cygwin. Untilthe last release of Cygwin, the stumbling block has always been finding(or building) a Cygwin compatible Perl interpreter for Automake to use.Thanks to the work of Eric Fifer, Perl 5.6.0 builds right out of the boxon Cygwin, removing this problem entirely. Ready built packages of Perland Automake are available from the CygUtils website.</P><P><A NAME="IDX72"></A>The initial Libtool support for Windows was written by Ian Lance Taylorof Cygnus Solutions, when Cygwin was at release b18, See section <A HREF="autobook_12.html#SEC12">Microsoft Windows</A>. More recent releases ofCygwin in general, and GCC in particular have much betterfacilities for building and linking with Windows DLLs, to theextent that with a little perseverance it is possible to build DLLswith GCC from C++ sources, and to have those DLLs interoperate withDLLs built with Windows development environments. In time,automation of these facilities will make their way into Libtool. Themethod that Libtool currently uses to build DLLs works with Cygwinreleases at least as far back as b18, and at least as far forward as theversion I am now using, Cygwin-1.1.1. The same code will also buildDLLs correctly with Mingw32. There are certainly simpler ways toassemble a DLL, but Libtool aims to combine two goals which aresomewhat in contention with Windows' treatment of DLLs; Libtool isaiming for maximum portability across the various flavours ofDLL-using Windows build environments; not forgetting Libtool'sraison d'êtrewhich is to abstract the many and varied ways of building libraries ondifferent targets behind a single unified interface. To meet these twogoals, Libtool must only use tools which exist across the range ofversions it supports, and must at the same time try to make DLLsappear to have the same characteristics as a modern ELF sharedlibrary, such as the shared libraries under GNU/Linux. This is nomean feat, and in fact Libtool still has some way to go in order to beable to do this convincingly. It turns out that Windows DLLs lackmany, many features that packages developed on Unix are likely to takefor granted. Emulation of these missing features are making their wayinto Libtool. Although support for DLLs is improving steadily withevery release, there are some severe technical problems with the Windowslibrary architecture that will prevent Libtool from ever being able tobuild DLLs completely transparently. The details are extremelytechnical and beyond the scope of this book.</P><P>As noted in <A HREF="autobook_274.html#SEC274">A.3 Installing the tools</A>, things will only work correctlyif each of Autoconf, Automake and Libtool are installed with the same<SAMP>`--prefix'</SAMP> argument, since they all share a macro directory in<TT>`$prefix/share/aclocal'</TT>.</P><P><A NAME="Writing A Cygwin Friendly Package"></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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