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<a name="Scripts"></a>
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<p>
Next: <a href="Machine-Dependent.html#Machine-Dependent" accesskey="n" rel="next">Machine Dependent</a>, Previous: <a href="Invocation.html#Invocation" accesskey="p" rel="prev">Invocation</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<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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<a name="Linker-Scripts"></a>
<h2 class="chapter">3 Linker Scripts</h2>

<a name="index-scripts"></a>
<a name="index-linker-scripts"></a>
<a name="index-command-files"></a>
<p>Every link is controlled by a <em>linker script</em>.  This script is
written in the linker command language.
</p>
<p>The main purpose of the linker script is to describe how the sections in
the input files should be mapped into the output file, and to control
the memory layout of the output file.  Most linker scripts do nothing
more than this.  However, when necessary, the linker script can also
direct the linker to perform many other operations, using the commands
described below.
</p>
<p>The linker always uses a linker script.  If you do not supply one
yourself, the linker will use a default script that is compiled into the
linker executable.  You can use the &lsquo;<samp>--verbose</samp>&rsquo; command-line option
to display the default linker script.  Certain command-line options,
such as &lsquo;<samp>-r</samp>&rsquo; or &lsquo;<samp>-N</samp>&rsquo;, will affect the default linker script.
</p>
<p>You may supply your own linker script by using the &lsquo;<samp>-T</samp>&rsquo; command
line option.  When you do this, your linker script will replace the
default linker script.
</p>
<p>You may also use linker scripts implicitly by naming them as input files
to the linker, as though they were files to be linked.  See <a href="Implicit-Linker-Scripts.html#Implicit-Linker-Scripts">Implicit Linker Scripts</a>.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="Basic-Script-Concepts.html#Basic-Script-Concepts" accesskey="1">Basic Script Concepts</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Basic Linker Script Concepts
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Script-Format.html#Script-Format" accesskey="2">Script Format</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Linker Script Format
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Simple-Example.html#Simple-Example" accesskey="3">Simple Example</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Simple Linker Script Example
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Simple-Commands.html#Simple-Commands" accesskey="4">Simple Commands</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Simple Linker Script Commands
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Assignments.html#Assignments" accesskey="5">Assignments</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Assigning Values to Symbols
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="SECTIONS.html#SECTIONS" accesskey="6">SECTIONS</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">SECTIONS Command
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="MEMORY.html#MEMORY" accesskey="7">MEMORY</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">MEMORY Command
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="PHDRS.html#PHDRS" accesskey="8">PHDRS</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">PHDRS Command
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="VERSION.html#VERSION" accesskey="9">VERSION</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">VERSION Command
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Expressions.html#Expressions">Expressions</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Expressions in Linker Scripts
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Implicit-Linker-Scripts.html#Implicit-Linker-Scripts">Implicit Linker Scripts</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Implicit Linker Scripts
</td></tr>
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