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| <h2 class="chapter">3 Linker Scripts</h2> |
| |
| <p><a name="index-scripts-334"></a><a name="index-linker-scripts-335"></a><a name="index-command-files-336"></a>Every link is controlled by a <dfn>linker script</dfn>. This script is |
| written in the linker command language. |
| |
| <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>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 ‘<samp><span class="samp">--verbose</span></samp>’ command line option |
| to display the default linker script. Certain command line options, |
| such as ‘<samp><span class="samp">-r</span></samp>’ or ‘<samp><span class="samp">-N</span></samp>’, will affect the default linker script. |
| |
| <p>You may supply your own linker script by using the ‘<samp><span class="samp">-T</span></samp>’ command |
| line option. When you do this, your linker script will replace the |
| default linker script. |
| |
| <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>. |
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| <ul class="menu"> |
| <li><a accesskey="1" href="Basic-Script-Concepts.html#Basic-Script-Concepts">Basic Script Concepts</a>: Basic Linker Script Concepts |
| <li><a accesskey="2" href="Script-Format.html#Script-Format">Script Format</a>: Linker Script Format |
| <li><a accesskey="3" href="Simple-Example.html#Simple-Example">Simple Example</a>: Simple Linker Script Example |
| <li><a accesskey="4" href="Simple-Commands.html#Simple-Commands">Simple Commands</a>: Simple Linker Script Commands |
| <li><a accesskey="5" href="Assignments.html#Assignments">Assignments</a>: Assigning Values to Symbols |
| <li><a accesskey="6" href="SECTIONS.html#SECTIONS">SECTIONS</a>: SECTIONS Command |
| <li><a accesskey="7" href="MEMORY.html#MEMORY">MEMORY</a>: MEMORY Command |
| <li><a accesskey="8" href="PHDRS.html#PHDRS">PHDRS</a>: PHDRS Command |
| <li><a accesskey="9" href="VERSION.html#VERSION">VERSION</a>: VERSION Command |
| <li><a href="Expressions.html#Expressions">Expressions</a>: Expressions in Linker Scripts |
| <li><a href="Implicit-Linker-Scripts.html#Implicit-Linker-Scripts">Implicit Linker Scripts</a>: Implicit Linker Scripts |
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