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<th width="60%" align="center">Chapter 7.
Building Berkeley DB for UNIX/POSIX
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<h2 class="title" style="clear: both"><a id="cross_compile_unix"></a>Cross-Compiling on Unix</h2>
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<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.
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