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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: User-Provided Input Files</TITLE><META NAME="description" CONTENT="Autoconf, Automake, and Libtool: User-Provided Input Files"><META NAME="keywords" CONTENT="Autoconf, Automake, and Libtool: User-Provided Input Files"><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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Theremainder of the files needed to build the package are generated by theGNU Autotools (see section <A HREF="autobook_25.html#SEC25">5.2 Generated Output Files</A>).</P><P><UL><LI><TT>`Makefile.am'</TT> is an input to <CODE>automake</CODE>.<LI><TT>`configure.in'</TT> is an input to <CODE>autoconf</CODE>.</UL><P>I like to think of <TT>`Makefile.am'</TT> as a high-level, bare-bonesspecification of a project's build requirements: what needs to be built,and where does it go when it is installed? This is probably Automake'sgreatest strength--the description is about as simple as it couldpossibly be, yet the final product is a <TT>`Makefile'</TT> with an array ofconvenient <CODE>make</CODE> targets.</P><P>The <TT>`configure.in'</TT> is a template of macro invocations and shellcode fragments that are used by <CODE>autoconf</CODE> to produce a<TT>`configure'</TT> script (see section <A HREF="autobook_276.html#SEC276">C. Generated File Dependencies</A>).<CODE>autoconf</CODE> copies the contents of <TT>`configure.in'</TT> to<TT>`configure'</TT>, expanding macros as they occur in the input. Othertext is copied verbatim.</P><P>Let's take a look at the contents of the user-provided input files thatare relevant to this minimal project. Here is the <TT>`Makefile.am'</TT>:</P><P><TABLE width=100%><tr><td> </td><td class=example bgcolor=#6688aa><br><pre>bin_PROGRAMS = foonlyfoonly_SOURCES = main.c foo.c foo.h nly.c scanner.l parser.yfoonly_LDADD = @LEXLIB@</pre></td></tr></table></P><P>This <TT>`Makefile.am'</TT> specifies that we want a program called<TT>`foonly'</TT> to be built and installed in the <TT>`bin'</TT> directory when<CODE>make install</CODE> is run. The source files that are used to build<TT>`foonly'</TT> are the C source files <TT>`main.c'</TT>, <TT>`foo.c'</TT>,<TT>`nly.c'</TT> and <TT>`foo.h'</TT>, the <CODE>lex</CODE> program in<TT>`scanner.l'</TT> and a <CODE>yacc</CODE> grammar in <TT>`parser.y'</TT>. Thispoints out a particularly nice aspect about Automake: because<CODE>lex</CODE> and <CODE>yacc</CODE> both generate intermediate C programsfrom their input files, Automake knows how to build such intermediatefiles and link them into the final executable. Finally, we mustremember to link a suitable <CODE>lex</CODE> library, if <TT>`configure'</TT>concludes that one is needed.</P><P>And here is the <TT>`configure.in'</TT>:</P><P><TABLE width=100%><tr><td> </td><td class=example bgcolor=#6688aa><br><pre>dnl Process this file with autoconf to produce a configure script.AC_INIT(main.c)AM_INIT_AUTOMAKE(foonly, 1.0)AC_PROG_CCAM_PROG_LEXAC_PROG_YACCAC_OUTPUT(Makefile)</pre></td></tr></table></P><P>This <TT>`configure.in'</TT> invokes some mandatory Autoconf and Automakeinitialization macros, and then calls on some Autoconf macros from the<CODE>AC_PROG</CODE> family to find suitable C compiler, <CODE>lex</CODE>, and<CODE>yacc</CODE> programs. Finally, the <CODE>AC_OUTPUT</CODE> macro is used tocause the generated <TT>`configure'</TT> script to output a<TT>`Makefile'</TT>---but from what? It is processed from<TT>`Makefile.in'</TT>, which Automake produces for you based on your<TT>`Makefile.am'</TT> (see section <A HREF="autobook_276.html#SEC276">C. Generated File Dependencies</A>).</P><P><A NAME="Generated Output Files"></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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