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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<title>Cross-Compiling on Unix</title>
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<link rel="start" href="index.html" title="Berkeley DB Installation and Build Guide" />
<link rel="up" href="build_unix.html" title="Chapter 7. Building Berkeley DB for UNIX/POSIX" />
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<p>Library Version 12.1.6.1</p>
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<tr>
<th colspan="3" align="center">Cross-Compiling on
Unix</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="build_unix_flags.html">Prev</a> </td>
<th width="60%" align="center">Chapter 7. Building Berkeley DB for UNIX/POSIX
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<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="cross_compile_unix"></a>Cross-Compiling on
Unix</h2>
</div>
</div>
</div>
<p>
The purpose of cross-compiling is to build a Berkeley DB
library on one platform that is to be used on a different
platform. This section demonstrates how to build a library
compatible with the ARM platform from a 32-bit x86 Linux
platform. You will need to adjust the build tools and options
to match your particular platforms.
</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>
Download, install, and test a toolchain that can
build the desired target binaries. In this example, we
use the <code class="literal">arm-linux-gnueabi-gcc</code>
package.
</p>
</li>
<li>
<p>
Decide on your configuration options, and set up
your environment to use the appropriate compiler and
compiler tools. It is often easiest to set this up as
a small shell script. For example:
</p>
<pre class="programlisting">#!/bin/sh -f
env \
CC=/usr/bin/arm-linux-gnueabi-gcc \
STRIP=/usr/bin/arm-linux-gnueabi-strip \
../dist/configure \
--build=i686-pc-linux-gnu \
--host=arm-linux-gnueabi \
--enable-java \
--enable-sql \
--enable-jdbc \
--enable-smallbuild \
--enable-shared \
--enable-stripped_messages \
--prefix=$HOME/ARM-linux/install \
$* </pre>
<p>
The <code class="literal">--build</code> flag indicates the
system on which you are compiling and the
<code class="literal">--host</code> flag indicates the
target platform. Adjust or omit the
<code class="literal">--enable</code> and
<code class="literal">--prefix</code> flag settings as
dictated by your own needs.
</p>
</li>
<li>
<p>
Unpack your Berkeley DB distribution and go to the
<code class="literal">build_unix</code> directory.
Alternatively, you may create a more
appropriately-named directory at the same level and
build in it. For example,
<code class="literal">build_arm</code>.
</p>
</li>
<li>
<p>
In your build directory, configure by executing
your script, then <code class="literal">make</code> and
<code class="literal">make install</code>. Review any
compiler warnings and fix if necessary, repeating the
<code class="literal">configure</code> and
<code class="literal">make</code> steps until you are
satisfied. The resulting libraries and executables can
then be transferred to your target system.
</p>
</li>
</ol>
</div>
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<td width="20%" align="center">
<a accesskey="u" href="build_unix.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="build_unix_install.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">Changing compile or load
options </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> Installing Berkeley
DB</td>
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