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111 lines
4.9 KiB
HTML
111 lines
4.9 KiB
HTML
4 years ago
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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 GNU linker LD
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(SiFive Binutils 2.32.0-2020.04.1)
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version 2.32.
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Copyright (C) 1991-2019 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 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>BFD (LD)</title>
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<meta name="description" content="BFD (LD)">
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<meta name="keywords" content="BFD (LD)">
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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="index.html#Top" rel="up" title="Top">
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<link href="BFD-outline.html#BFD-outline" rel="next" title="BFD outline">
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<link href="Xtensa.html#Xtensa" rel="prev" title="Xtensa">
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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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div.display {margin-left: 3.2em}
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div.example {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.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="BFD"></a>
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<div class="header">
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<p>
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Next: <a href="Reporting-Bugs.html#Reporting-Bugs" accesskey="n" rel="next">Reporting Bugs</a>, Previous: <a href="Machine-Dependent.html#Machine-Dependent" accesskey="p" rel="prev">Machine Dependent</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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="BFD-1"></a>
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<h2 class="chapter">5 BFD</h2>
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<a name="index-back-end"></a>
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<a name="index-object-file-management"></a>
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<a name="index-object-formats-available"></a>
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<a name="index-objdump-_002di"></a>
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<p>The linker accesses object and archive files using the BFD libraries.
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These libraries allow the linker to use the same routines to operate on
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object files whatever the object file format. A different object file
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format can be supported simply by creating a new BFD back end and adding
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it to the library. To conserve runtime memory, however, the linker and
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associated tools are usually configured to support only a subset of the
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object file formats available. You can use <code>objdump -i</code>
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(see <a href="http://sourceware.org/binutils/docs/binutils/objdump.html#objdump">objdump</a> in <cite>The GNU Binary Utilities</cite>) to
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list all the formats available for your configuration.
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</p>
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<a name="index-BFD-requirements"></a>
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<a name="index-requirements-for-BFD"></a>
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<p>As with most implementations, BFD is a compromise between
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several conflicting requirements. The major factor influencing
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BFD design was efficiency: any time used converting between
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formats is time which would not have been spent had BFD not
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been involved. This is partly offset by abstraction payback; since
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BFD simplifies applications and back ends, more time and care
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may be spent optimizing algorithms for a greater speed.
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</p>
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<p>One minor artifact of the BFD solution which you should bear in
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mind is the potential for information loss. There are two places where
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useful information can be lost using the BFD mechanism: during
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conversion and during output. See <a href="BFD-information-loss.html#BFD-information-loss">BFD information loss</a>.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="BFD-outline.html#BFD-outline" accesskey="1">BFD outline</a>:</td><td> </td><td align="left" valign="top">How it works: an outline of BFD
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</td></tr>
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</table>
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</body>
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</html>
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