134 lines
6.7 KiB
HTML
134 lines
6.7 KiB
HTML
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<!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 BFD library.
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Copyright (C) 1991-2016 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 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "GNU General Public License" and "Funding
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Free Software", the Front-Cover texts being (a) (see below), and with
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the Back-Cover Texts being (b) (see below). A copy of the license is
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included in the section entitled "GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Untitled Document: Adding symbols from an archive</title>
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<meta name="description" content="Untitled Document: Adding symbols from an archive">
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<meta name="keywords" content="Untitled Document: Adding symbols from an archive">
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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="BFD-Index.html#BFD-Index" rel="index" title="BFD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Adding-Symbols-to-the-Hash-Table.html#Adding-Symbols-to-the-Hash-Table" rel="up" title="Adding Symbols to the Hash Table">
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<link href="Performing-the-Final-Link.html#Performing-the-Final-Link" rel="next" title="Performing the Final Link">
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<link href="Adding-symbols-from-an-object-file.html#Adding-symbols-from-an-object-file" rel="prev" title="Adding symbols from an object file">
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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="Adding-symbols-from-an-archive"></a>
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<div class="header">
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<p>
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Previous: <a href="Adding-symbols-from-an-object-file.html#Adding-symbols-from-an-object-file" accesskey="p" rel="prev">Adding symbols from an object file</a>, Up: <a href="Adding-Symbols-to-the-Hash-Table.html#Adding-Symbols-to-the-Hash-Table" accesskey="u" rel="up">Adding Symbols to the Hash Table</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Adding-symbols-from-an-archive-1"></a>
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<h4 class="subsubsection">2.17.2.3 Adding symbols from an archive</h4>
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<p>When the <code>_bfd_link_add_symbols</code> routine is passed an
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archive, it must look through the symbols defined by the
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archive and decide which elements of the archive should be
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included in the link. For each such element it must call the
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<code>add_archive_element</code> linker callback, and it must add the
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symbols from the object file to the linker hash table. (The
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callback may in fact indicate that a replacement BFD should be
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used, in which case the symbols from that BFD should be added
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to the linker hash table instead.)
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</p>
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<a name="index-_005fbfd_005fgeneric_005flink_005fadd_005farchive_005fsymbols"></a>
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<p>In most cases the work of looking through the symbols in the
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archive should be done by the
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<code>_bfd_generic_link_add_archive_symbols</code> function.
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<code>_bfd_generic_link_add_archive_symbols</code> is passed a function
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to call to make the final decision about adding an archive
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element to the link and to do the actual work of adding the
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symbols to the linker hash table. If the element is to
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be included, the <code>add_archive_element</code> linker callback
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routine must be called with the element as an argument, and
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the element’s symbols must be added to the linker hash table
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just as though the element had itself been passed to the
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<code>_bfd_link_add_symbols</code> function.
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</p>
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<p>When the a.out <code>_bfd_link_add_symbols</code> function receives an
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archive, it calls <code>_bfd_generic_link_add_archive_symbols</code>
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passing <code>aout_link_check_archive_element</code> as the function
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argument. <code>aout_link_check_archive_element</code> calls
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<code>aout_link_check_ar_symbols</code>. If the latter decides to add
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the element (an element is only added if it provides a real,
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non-common, definition for a previously undefined or common
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symbol) it calls the <code>add_archive_element</code> callback and then
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<code>aout_link_check_archive_element</code> calls
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<code>aout_link_add_symbols</code> to actually add the symbols to the
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linker hash table - possibly those of a substitute BFD, if the
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<code>add_archive_element</code> callback avails itself of that option.
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</p>
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<p>The ECOFF back end is unusual in that it does not normally
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call <code>_bfd_generic_link_add_archive_symbols</code>, because ECOFF
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archives already contain a hash table of symbols. The ECOFF
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back end searches the archive itself to avoid the overhead of
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creating a new hash table.
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</p>
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<hr>
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<div class="header">
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<p>
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Previous: <a href="Adding-symbols-from-an-object-file.html#Adding-symbols-from-an-object-file" accesskey="p" rel="prev">Adding symbols from an object file</a>, Up: <a href="Adding-Symbols-to-the-Hash-Table.html#Adding-Symbols-to-the-Hash-Table" accesskey="u" rel="up">Adding Symbols to the Hash Table</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-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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