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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<section id="enea-linux-install-cc-toolchain">
<title>Install the Cross-Compilation Toolchain</title>
<para>Before cross-compiling<indexterm>
<primary>cross-compiling</primary>
</indexterm> applications for your target, you need to install the
Software Development Kit (SDK<indexterm>
<primary>SDK</primary>
</indexterm>) - which contains the cross-compilation toolchain<indexterm>
<primary>toolchain</primary>
</indexterm> - and set up the cross-compilation environment on your host.
The toolchain for each supported target contains a 32-bit and a 64-bit
library for gcc. The toolchain and the environment-setup script are wrapped
together inside a toolchain installer in the form of a shell script.</para>
<simplelist>
<member>Name of the installer:</member>
<member><literal><xi:include href="../../docsrc_common/pardoc-distro.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"
xpointer="element(EneaLinux_SDK_INSTALLER/1)" /></literal></member>
</simplelist>
<simplelist>
<member>Name of the environment-setup scripts:</member>
<member><literal><xi:include href="../../docsrc_common/pardoc-distro.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"
xpointer="element(EneaLinux_SDK_ENV_SCRIPT_32/1)" /></literal></member>
<member><literal><xi:include href="../../docsrc_common/pardoc-distro.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"
xpointer="element(EneaLinux_SDK_ENV_SCRIPT_64/1)" /></literal></member>
</simplelist>
<para>The cross-compilation toolchain for <literal>t4240rdb-64b</literal> is
packaged as follows:<itemizedlist spacing="compact">
<listitem>
<para>The toolchain contains two libs: <literal>lib</literal> (32-bit)
and <literal>lib64</literal> (64-bit).</para>
</listitem>
<listitem>
<para>The installer wraps two environment-setup scripts. Which script
you run selects which lib will be used by gcc. This way, both 32-bit
applications and 64-bit applications can be cross-compiled for
t4240rdb-64b.</para>
<note>
<para>There are currently problems with 32-bit applications on the
64-bit T4240, see "Known Problems" in the Release
Information.</para>
</note>
</listitem>
</itemizedlist>Do as in the example below to install the SDK and set up
the cross-compilation environment:</para>
<orderedlist>
<listitem>
<para>Get the cross-compilation toolchain installer; either a
precompiled one (A) or build it yourself (B).</para>
<orderedlist numeration="upperalpha">
<listitem>
<para>The quickest alternative is to use a precompiled installer for
your host and target. Download the appropriate installer from the
server appointed to you by Enea. You find the installer in the
<filename>sdk</filename> directory on the download site:</para>
<para><programlisting>$ wget <xi:include
href="../../docsrc_common/pardoc-distro.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"
xpointer="element(ULINK_ENEA_LINUX_URL/1)" />/t4240-64b/sdk/\
<xi:include href="../../docsrc_common/pardoc-distro.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"
xpointer="element(EneaLinux_SDK_INSTALLER/1)" /></programlisting></para>
</listitem>
<listitem>
<para>... or build your own cross-compilation toolchain. First
source the build environment setup script to create a
<build_dir> with conf files, then run bitbake with option
<literal>-c populate_sdk</literal> to build the toolchain and wrap
it inside an installer, saved in
<filename><build_dir>/tmp/deploy/sdk/</filename>.</para>
<programlisting>$ source enea-init-build-env -b build_t4240rdb
$ bitbake <xi:include href="../../docsrc_common/pardoc-distro.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"
xpointer="element(EneaLinux_SDK_IMAGE/1)" /> -c populate_sdk
$ cd ../build_t4240rdb/tmp/deploy/sdk/</programlisting>
</listitem>
</orderedlist>
</listitem>
<listitem>
<para>Run the installer to unpack the cross-compilation toolchain and
the environment-setup script:</para>
<programlisting>$ chmod 770 \
<xi:include href="../../docsrc_common/pardoc-distro.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"
xpointer="element(EneaLinux_SDK_INSTALLER/1)" />
$ ./<xi:include href="../../docsrc_common/pardoc-distro.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"
xpointer="element(EneaLinux_SDK_INSTALLER/1)" /></programlisting>
<para>When prompted, select to install the SDK in the desired directory,
referred to as <literal><sdkdir></literal>, by default
<filename>/opt/enea/<sdkver></filename>. The installer unpacks the
environment setup script in <filename><sdkdir></filename> and the
toolchain under <filename><sdkdir>/sysroots</filename>.</para>
<note>
<para>Choose a unique directory for each toolchain. Installing a
second toolchain of any type (buildtools toolchain or
cross-compilation toolchain) in the same directory as a previously
installed one will break the $PATH variable of the first one.</para>
</note>
</listitem>
<listitem>
<para>Setup the toolchain environment by sourcing the environment-setup
script, here exemplified for 32-bit toolchain:<programlisting>$ source <sdkdir>/<xi:include
href="../../docsrc_common/pardoc-distro.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"
xpointer="element(EneaLinux_SDK_ENV_SCRIPT_64/1)" /></programlisting></para>
</listitem>
</orderedlist>
<para>Once the cross-compilation toolchain is in place and the environment
set up, you can proceed with <link
linkend="enea-linux-cross-compile-from-command-line">Cross-Compiling
Applications from Command Line.</link>.</para>
<para>The above instructions and the files on the download site should
provide you with all you need to be able to cross-compile applications for
your target.</para>
<remark>INFO: Corresponding Yocto documentation is available at <xi:include
href="../../docsrc_common/pardoc-distro.xml"
xmlns:xi="http://www.w3.org/2001/XInclude"
xpointer="element(ULINK_YOCTO_ADT_TOOLCHAIN_URL/1)" />. Note that the file
names mentioned in the Yocto documentation differ from the ones in the Enea
Linux distribution.</remark>
</section>
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