Sunday, 24 January 2010

Cross Development Environment on Debian GNU/Linux

http://www.mobilab.unina.it/Resources/crosscompilerHOWTO.html

Introduction

In this HOWTO, we will explain how to set up a cross development environment for the ARM platform including the use of libglib2.0. The ARM processor can be found in a number of embedded devices and PDAs, e.g. the Zaurus and the iPAQ.

Note

All packages and versions are related to Debian SID.

Preparations


First, install toolchain-source and dpkg-cross. Because toolchain-source depends on dpkg-cross, the following command will do:
# apt-get install toolchain-source
The toolchain-source package contains the source code of the current gcc and binutils. Additionally, it provides commands assisting in building cross compilers and binutils.
Optionally, install the package toolchain-source-gdb, if you believe in debugging.
The dpkg-cross package is a tool for installing libraries and headers for cross compiling in special directories.
We had a problem with building gcc with autoconf version 2.54, so we recommend to:
# apt-get install autoconf2.13
For building the actual cross development packages, you will need fakeroot or a similar program. Because fakeroot will be used by default, just do this:
# apt-get install fakeroot
The only configuration, that is necessary now, is to change the crossbase in the file /etc/dpkg/cross-compile. The default value /usr/local should be changed:
crossbase = /usr

Setting up binutils, libc and the compiler


binutils



# cd /usr/src/; tpkg-make arm-linux
New directories binutils-arm-linux-2.13.90.x.y/ and gcc-arm-linux-3.2.z/ appear.
Adjust the user name in {binutils-arm-linux-2.13.90.x.y,gcc-arm-linux-3.2.z}/debian/{changelog,control}, if necessary. You might get an error when signing the package, if the user name is not correct. You may use pga tool for creating a secret key, if you haven't one.
If you have to pass parameters to the configure or make process of binutils, change the files binutils-arm-linux-2.13.90.x.y/debian/rules.

# cd binutils-arm-linux-2.13.90.0.4/; debuild -uc -us
# debi

libc



# tpkg-install-libc arm-linux
This command will download the libraries for the arm-linux platform from the british Debian server ftp.uk.debian.org, but the server can be changed via the environment variable TPKG_SERVER. The downloaded packages will automatically converted and installed by dpkg-cross.

Creating dummy packages


The dependencies of libc6 and libc6-dev are already fulfilled by libc6-arm-cross and libc6-dev-arm-cross, the dependency libglib2.0-0 will be fulfilled anyway. That leaves pkg-config. A cross version of pkg-config does not make sense, because the only important thing is the output of the command itself. This depends on the contents of the .pc files. Therefore it is sufficient to create a dummy package that depends on pkg-config. Install the equivs package:

# apt-get install equivs

(just fix your address and the target platform), you can build the dummy package:
<a name="mkXdummy"></a>#!/bin/sh<br /><br /><span lang="en">EMAIL='You <you@your.isp>'</span><br /><span lang="en">TARGET=arm-cross</span><br /><br /><span lang="en">if [ -z "$1" ]; then echo "no package"; exit -1; fi</span><br /><br /><span lang="en">PACKAGE=$1</span><br /><span lang="en">VERSION=`dpkg-query -W --showformat='${Version}' $PACKAGE | sed 's/-.*/-1/'`</span><br /><br /><span lang="en">echo "Section: devel</span><br /><span lang="en">Priority: optional</span><br /><span lang="en">Standards-Version: 3.6.1.0</span><br /><br /><span lang="en">Package: $PACKAGE-$TARGET</span><br /><span lang="en">Version: $VERSION</span><br /><span lang="en">Maintainer: $EMAIL</span><br /><span lang="en">Depends: $PACKAGE</span><br /><span lang="en">Architecture: all</span><br /><span lang="en">Description: Dummy $PACKAGE for $TARGET" > $PACKAGE-$TARGET.$</span><br /><br /><span lang="en">equivs-build $PACKAGE-$TARGET.$ && rm -rf ./equivs/ $PACKAGE-$TARGET.$</span><br />
$ mkXdummy pkg-config
Then, you have to install the dummy package:
# dpkg -i pkg-config-arm-cross_0.15.0-2_all.deb
Similar actions are necessary for tools, that are not platform-dependent, such as bison, flex, indent.

gcc



# cd ../gcc-arm-linux-3.3.z/<br /><span lang="en"># debuild</span>
# debi

g++



--enable-languages=c++
# debuild<br /><span lang="en"># debi</span>

# cd /usr/arm-linux/lib<br /><span lang="en"># tar xvzf <PATH>/libstdc++.tar.gz</span>
Install templates and header files:
# cd /usr/arm-linux/include<br /><span lang="en"># tar xvzf <PATH>/include_g++.tar.gz</span>
Now you should have a cross development environment for C++ language.

Setting up additional cross development libraries


There are not many programs a user really wants without the need for more library dependencies than just the standard C library. A typical additional library is glib2 which is used by GTK+ and GNOME.
Before you can start with the library, you have to analyse its dependencies:
$ apt-cache show libglib2.0-0|grep ^Depends:<br /><span lang="en">Depends: libc6 (>= 2.3.1-1)</span><br /><span lang="en">$apt-cache show libglib2.0-dev|grep ^Depends:</span><br /><span lang="en">Depends: libglib2.0-0 (= 2.0.7-1), libc6-dev | libc-dev, pkg-config</span>
The dependency on pkg-config-arm-cross can be fulfilled by a dummy package (see above). The output of pkg-config depends only on the contents of the .pc files.

Install libraries



# tpkg-install-libc arm-linux 'libglib2.0-0$ libglib2-dev

Reference



The dollar signs are necessary for the tool as are the single quotes.
The cross compilation environment should now be complete.

Try it out



$ PKG_CONFIG_PATH=/usr/arm-linux/lib/pkgconfig pkg-config --cflags glib-2.0<br /><span lang="en">-I/usr/arm-linux/include/glib-2.0 -I/usr/arm-linux/lib/glib-2.0/include</span>
For packages, that come with a simple Makefile, use CC and CFLAGS=`pkg-config --cflags glib-2.0` etc., compilation is straight forward:

$ CC=/usr/bin/arm-linux-gcc \<br /><span lang="en">PKG_CONFIG_PATH=/usr/arm-linux/lib/pkgconfig make</span>
$ CC=/usr/bin/arm-linux-gcc \<br /><span lang="en">PKG_CONFIG_PATH=/usr/arm-linux/lib/pkgconfig ./configure; make</span>

Reference




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