116 lines
5.2 KiB
HTML
116 lines
5.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU linker LD
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(GNU Toolchain for the A-profile Architecture 10.3-2021.07 (arm-10.29))
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version 2.36.1.
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Copyright (C) 1991-2021 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License". -->
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<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>LD: libdep Plugin</title>
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<meta name="description" content="LD: libdep Plugin">
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<meta name="keywords" content="LD: libdep Plugin">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="LD-Index.html#LD-Index" rel="index" title="LD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Plugins.html#Plugins" rel="up" title="Plugins">
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<link href="Machine-Dependent.html#Machine-Dependent" rel="next" title="Machine Dependent">
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<link href="Plugins.html#Plugins" rel="previous" title="Plugins">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.indentedblock {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style:oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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ul.no-bullet {list-style: none}
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="libdep-Plugin"></a>
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<div class="header">
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<p>
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Up: <a href="Plugins.html#Plugins" accesskey="u" rel="up">Plugins</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="LD-Index.html#LD-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Static-Library-Dependencies-Plugin"></a>
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<h3 class="section">4.1 Static Library Dependencies Plugin</h3>
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<a name="index-static-library-dependencies"></a>
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<p>Originally, static libraries were contained in an archive file consisting
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just of a collection of relocatable object files. Later they evolved to
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optionally include a symbol table, to assist in finding the needed objects
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within a library. There their evolution ended, and dynamic libraries
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rose to ascendance.
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</p>
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<p>One useful feature of dynamic libraries was that, more than just collecting
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multiple objects into a single file, they also included a list of their
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dependencies, such that one could specify just the name of a single dynamic
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library at link time, and all of its dependencies would be implicitly
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referenced as well. But static libraries lacked this feature, so if a
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link invocation was switched from using dynamic libraries to static
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libraries, the link command would usually fail unless it was rewritten to
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explicitly list the dependencies of the static library.
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</p>
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<p>The GNU <code>ar</code> utility now supports a <samp>--record-libdeps</samp> option
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to embed dependency lists into static libraries as well, and the <samp>libdep</samp>
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plugin may be used to read this dependency information at link time. The
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dependency information is stored as a single string, carrying <samp>-l</samp>
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and <samp>-L</samp> arguments as they would normally appear in a linker
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command line. As such, the information can be written with any text
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utility and stored into any archive, even if GNU <code>ar</code> is not
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being used to create the archive. The information is stored in an
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archive member named ‘<samp>__.LIBDEP</samp>’.
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</p>
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<p>For example, given a library <samp>libssl.a</samp> that depends on another
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library <samp>libcrypto.a</samp> which may be found in <samp>/usr/local/lib</samp>,
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the ‘<samp>__.LIBDEP</samp>’ member of <samp>libssl.a</samp> would contain
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</p>
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<div class="smallexample">
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<pre class="smallexample">-L/usr/local/lib -lcrypto
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</pre></div>
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<hr>
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<div class="header">
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<p>
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Up: <a href="Plugins.html#Plugins" accesskey="u" rel="up">Plugins</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="LD-Index.html#LD-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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