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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: 14.3 Install hooks</TITLE><META NAME="description" CONTENT="Autoconf, Automake, and Libtool: 14.3 Install hooks"><META NAME="keywords" CONTENT="Autoconf, Automake, and Libtool: 14.3 Install hooks"><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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This rule can be used to install things in ways thatAutomake usually does not support.</P><P>For instance, in <CODE>libgcj</CODE> we generate a number of header files, oneper Java class. We want to install them in <SAMP>`pkgincludedir'</SAMP>, but wewant to preserve the hierarchical structure of the headers (e.g., wewant <TT>`java/lang/String.h'</TT> to be installed as<TT>`$(pkgincludedir)/java/lang/String.h'</TT>, not<TT>`$(pkgincludedir)/String.h'</TT>), and Automake does not currentlysupport this. So we resort to a local rule, which is a bit morecomplicated than you might expect:</P><P><TABLE width=100%><tr><td> </td><td class=example bgcolor=#6688aa><br><pre>install-data-local: @for f in $(nat_headers) $(extra_headers); do \## Compute the install directory at runtime. d="echo $$f | sed -e s,/[^/]*$$,,'"; \## Make the install directory. $(mkinstalldirs) $(DESTDIR)$(includedir)/$$d; \## Find the header file -- in our case it might be in srcdir or## it might be in the build directory. "p" is the variable that## names the actual file we will install. if test -f $(srcdir)/$$f; then p=$(srcdir)/$$f; else p=$$f; fi; \## Actually install the file. $(INSTALL_DATA) $$p $(DESTDIR)$(includedir)/$$f; \ done</pre></td></tr></table></P><P>A hook is guaranteed to run after the install of objects in thisdirectory has completed. This can be used to modify files after theyhave been installed. There are two install hooks, named<CODE>install-data-hook</CODE> and <CODE>install-exec-hook</CODE>.</P><P>For instance, suppose you have written a program which must be<CODE>setuid</CODE> root. You can accomplish this by changing the permissionsafter the program has been installed:</P><P><TABLE width=100%><tr><td> </td><td class=example bgcolor=#6688aa><br><pre>bin_PROGRAMS = susu_SOURCES = su.cinstall-exec-hook: chown root $(bindir)/su chmod u+s $(bindir)/su</pre></td></tr></table></P><P>Unlike an install hook, and install rule is not guaranteed to be afterall other install rules are run. This lets it be run in parallel withother install rules when a parallel <CODE>make</CODE> is used. Ordinarilythis is not very important, and in practice you almost always see localhooks and not local rules.</P><P>The biggest caveat to using a local rule or an install hook is to makesure that it will work when the source and build directories are not thesame--many people forget to do this. This means being sure to look in<SAMP>`$(srcdir)'</SAMP> when the file is a source file.</P><P>It is also very important to make sure that you do not use a local rulewhen install order is important -- in this case, your <TT>`Makefile'</TT>will succeed on some machines and fail on others.</P><P></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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