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New section on external toolchain usage

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Thomas Petazzoni 2009-04-28 21:12:23 +00:00
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@ -36,6 +36,7 @@
same buildroot source tree</a></li>
<li><a href="#using_toolchain">Using the uClibc toolchain
outside Buildroot</a></li>
<li><a href="#external_toolchain">Use an external toolchain</a></li>
<li><a href="#downloaded_packages">Location of downloaded packages</a>
</li>
<li><a href="#add_software">Extending Buildroot with more
@ -840,7 +841,43 @@ ln -s &lt;shared download location&gt; dl
export BUILDROOT_DL_DIR &lt;shared download location&gt;
</pre>
<h2><a name="external_toolchain" id="external_toolchain"></a>Using
an external toolchain</h2>
<p>It might be useful not to use the toolchain generated by
Buildroot, for example if you already have a toolchain that is known
to work for your specific CPU, or if the toolchain generation feature
of Buildroot is not sufficiently flexible for you (for example if you
need to generate a system with <i>glibc</i> instead of
<i>uClibc</i>). Buildroot supports using an <i>external
toolchain</i>.</p>
<p>To enable the use of an external toolchain, go in the
<code>Toolchain</code> menu, and&nbsp;:</p>
<ul>
<li>Select the <code>External binary toolchain</code> toolchain
type</li>
<li>Adjust the <code>External toolchain path</code>
appropriately. It should be set to a path where a bin/ directory
contains your cross-compiling tools</li>
<li>Adjust the <code>External toolchain prefix</code>, so that the
prefix, suffixed with <code>-gcc</code> or <code>-ld</code> will
correspond to your cross-compiling tools</li>
</ul>
<p>If you are using an external toolchain based on <i>uClibc</i>, the
<code>Core C library from the external toolchain</code> and
<code>Libraries to copy from the external toolchain</code> options
should already have correct values. However, if your external
toolchain is based on <i>glibc</i>, you'll have to change these values
according to your cross-compiling toolchain.</p>
<p>To generate external toolchains, we recommend using <a
href="http://ymorin.is-a-geek.org/dokuwiki/projects/crosstool">Crosstool-NG</a>.
It allows to generate toolchains based on <i>uClibc</i>, <i>glibc</i>
and <i>eglibc</i> for a wide range of architectures, and has good
community support.</p>
<h2><a name="add_software" id="add_software"></a>Extending Buildroot with
more software</h2>