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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: Language support</TITLE><META NAME="description" CONTENT="Autoconf, Automake, and Libtool: Language support"><META NAME="keywords" CONTENT="Autoconf, Automake, and Libtool: Language support"><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; 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Automakelets you handle these cases in a natural way.</P><P>Automake's notion of a `language' is tied to the suffix appended toeach source file written in that language. You must inform Automake ofeach new suffix you introduce. This is done by listing them in the<SAMP>`SUFFIXES'</SAMP> macro. For instance, suppose you are writing part ofyour program in the language <SAMP>`M'</SAMP>, which is compiled to object codeby a program named <CODE>mc</CODE>. The typical suffix for an <SAMP>`M'</SAMP>source file is <SAMP>`.m'</SAMP>. In your <TT>`Makefile.am'</TT> you would write:</P><P><TABLE width=100%><tr><td> </td><td class=example bgcolor=#6688aa><br><pre>SUFFIXES = .m</pre></td></tr></table></P><P>This differs from ordinary <CODE>make</CODE> usage, where you would use thespecial <CODE>.SUFFIX</CODE> target to list suffixes.</P><P>Now you need to tell Automake (and <CODE>make</CODE>) how to compile a<TT>`.m'</TT> file to a <TT>`.o'</TT> file. You do this by writing an ordinary<CODE>make</CODE> suffix rule:</P><P><TABLE width=100%><tr><td> </td><td class=example bgcolor=#6688aa><br><pre>MC = mc.m.o: $(MC) $(MCFLAGS) $(AM_MCFLAGS) -c $<</pre></td></tr></table></P><P>Note that we introduced the <SAMP>`MC'</SAMP>, <SAMP>`MCFLAGS'</SAMP>, and<SAMP>`AM_MCFLAGS'</SAMP> variables. While not required, this is good style incase you want to override any of these later (for instance from thecommand line).</P><P>Automake understands enough about suffix rules to recognize that<TT>`.m'</TT> files can be treated just like any file it alreadyunderstands, so now you can write:</P><P><TABLE width=100%><tr><td> </td><td class=example bgcolor=#6688aa><br><pre>bin_PROGRAMS = myprogrammyprogram_SOURCES = foo.c something.m</pre></td></tr></table></P><P>Note that Automake does not really understand chained suffix rules;however, frequently the right thing will happen anyway. For instance,if you have a <CODE>.m.c</CODE> rule, Automake will naively assume that<SAMP>`.m'</SAMP> files should be turned into <SAMP>`.o'</SAMP> files -- and then itwill proceed to rely on <CODE>make</CODE> to do the real work. In thisexample, if the translation takes three steps--from <SAMP>`.m'</SAMP> to<SAMP>`.x'</SAMP>, then from <SAMP>`.x'</SAMP> to <SAMP>`.c'</SAMP>, and finally to<SAMP>`.o'</SAMP>---then Automake's simplistic approach will break.Fortunately, these cases are very rare.</P><P><A NAME="Automatic dependency tracking"></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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