Cross compiling VLC for ARM-Linux based platforms Marc Ariberti Jean-Paul Saman v0.0.2, 19 march 2004 This document describes all the steps to cross compile vlc for ARM based platforms. It describes how to build a cross compilation toolchain, how to build the libraries needed by vlc and the compilation of the vlc itself. Introduction

This document is only a first draft. It does not intend to cover all the subject. You may still have some problems at some steps or find better way to do them. If you have any comment do not hesitate to contact us.

Which platforms are targeted ?

I will describe here how to compile vlc for an ARM based PDA running linux. It includes for example : Compaq - iPaq (H36xx, H38xx,...), using Familiar Linux GNU Portable Environment (GPE) Opie YOPY/Linupy Zaurus

Requirements for cross-compilation Why cross-compiling ?

It is of course possible to compile directly on the targeted platform. But there are a lot of great advantages to cross-compile : The most important one is probably the speed, because a desktop computer is most of the time faster than a PDA for compilation. Another big problem is that a complete compilation toolchain does take a great amount of disk space. And this space is usually very limited on embedded systems. And there also may not be enough memory to compile big files.

Building the toolchain Prerequisite Importants paths

During this section, we will use the following paths :

I would personally advise to compile everything as a normal user and then install everything as root.


This is where the sources will be located and where the compilation will be done. (eg: /usr/src or /home/foobar/arm-src).


This is where you want to install your cross compilation toolchain. It can be either installed system-wide (in /usr/local/arm/2.95.3 for example). Installation steps (i.e. make install) will have to be done as root. Or it can be installed in user-land, for the user's own use (/home/foobar/arm/2.95.3 for example). In this paper, the chosen prefix is /usr/local/arm/2.95.3, you will have to adapt the commands to what you choose..

Files needed

Download the following files and put them in the ${SRCDIR}. Most of them are available on the . binutils-2.11.2.tar.gz linux-2.4.19.tar.bz2 patch-2.4.19-rmk4.bz2 gcc-2.95.3.tar.gz gcc-2.95.3.diff.bz2 gcc-2.95.3.diffbis.bz2 gcc-2.95.3.diff2 glibc-2.2.5.tar.gz glibc-linuxthreads-2.2.5.tar.gz SDL-1.2.5.tar.gz glib-1.2.10.tar.gz ffmpeg.tar.gz mad-0.14.2b.tar.gz flac-1.1.0.tar.gz libdvbpsi-0.1.2.tar.gz a52dec-0.7.4.tar.gz


Compiling binutils is pretty simple : tar -xzf binutils-2.11.2.tar.gz cd binutils-2.11.2 ./configure --target=arm-linux --prefix=/usr/local/arm/2.95.3 make make install

Preparing linux kernel

tar -xzf linux-2.4.19.tar.bz2 bunzip2 patch-2.4.19-rmk4.bz2 cd linux-2.4.19 patch -p1 < ../patch-2.4.19-rmk4.bz2 make clean ARCH=arm CROSS_COMPILE=arm-linux- make ARCH=arm h3600_config Do not forget to save the configuration even if no changes are made ! make ARCH=arm menuconfig make symlinks ARCH=arm CROSS_COMPILE=arm-linux- mkdir -p /usr/local/arm/2.95.3/arm-linux/include cp -Rf include/asm include/asm-arm include/linux \ /usr/local/arm/2.95.3/arm-linux/include cd /usr/local/arm/2.95.3/arm-linux ln -s include sys-linux

Basic cross compiler (gcc)

tar -xvzf gcc-2.95.3.tar.gz bunzip2 gcc-2.95.3.diff.bz2 bunzip2 gcc-2.95.3.diffbis.bz2 patch -p1 -d gcc-2.95.3 < gcc-2.95.3.diff patch -p1 -d gcc-2.95.3 < gcc-2.95.3.diffbis cd gcc-2.95.3 ./configure --target=arm-linux --disable-threads --enable-languages=c \ --prefix=/usr/local/arm/2.95.3 --with-headers=linux-2.4.19/include make make install

Compiling glibc

Depending on your target, you may choose another glibc version (eg: 2.1.3 for linupy 1.4) tar -xvzf glibc-2.2.5.tar.gz cd glibc-2.2.5 tar -xvzf ../glibc-linuxthreads-2.2.5.tar.gz CC=arm-linux-gcc ./configure arm-linux --target=arm-linux \ --prefix=/usr/local/arm/2.95.3/arm-linux --enable-add-ons The following step is quite long ! CC=arm-linux-gcc make If you have problems compiling glibc due to pread/pwrite, edit sysdeps/unix/sysv/linux/kernel-features.h and turn __ASSUME_PREAD_SYSCALL and __ASSUME_PWRITE_SYSCALL from 1 to 0. CC=arm-linux-gcc make install

Full cross compiler (gcc)

rm -Rf gcc-2.95.3 tar -xvzf gcc-2.95.3.tar.gz patch -p1 -d gcc-2.95.3 < gcc-2.95.3.diff patch -p1 -d gcc-2.95.3 < gcc-2.95.3.diff2 cd gcc-2.95.3 ./configure --target=arm-linux --prefix=/usr/local/arm/2.95.3 make make install

Compiling linux kernel Misc

Add /usr/local/arm/2.95.3/bin to your PATH. Add the following line (depends on your shell) to your shell's configuration file : export PATH=/usr/local/arm/2.95.3/bin:$PATH I would advise you to completely log out and then log in again, so that the change would be taken into account. You can now check that when you type arm-linux-gcc, it launches the cross-compiler.

Next are some packages that you may compile by yourself, but I found it was easier to use the precompiled packages. You can take them at . You may find packages with other version numbers which should not be a problem. libgcc1_3.1.1-1_arm.ipk This provides which is needed to compile some libraries. xlibs_4.1-5_arm.ipk, xlibs-dev_4.1.0-16_arm.ipk Those are the libraries ans the development files for X windows. zlib1g_1.1.4-3_arm.ipk, zlib1g-dev_1.1.3-fam1_arm.ipk These libraries are needed by some libraries to compile. Install these packages on your compiler box in /usr/local/arm/2.95.3/arm-linux : You can use the script : #!/bin/sh # script to install .ipk into the arm-toolchain # usage : ./ foobar.ipk if ! tar -xvzf $1 2> /dev/null then ar xv $1 2> /dev/null fi cp data.tar.gz /usr/local/arm/2.95.3/arm-linux cd /usr/local/arm/2.95.3/arm-linux tar -xvzf data.tar.gz

Setting up Opie cross-compile environment

Download the Opie SDK from the website using the menuitem "Download Opie SDK" or try the direct link here: . Download all files to your ${SOURCES}/opie directory.

Opie SDK

The Opie SDK does not come with a README file or installation instructions. I give them here instead. There are two tar files in the download a OpieSDK.tar.gz2 and a kdevelop_src.tar.bz2. The last file is a modified kdevelop for use with the OpieSDK. In this tutorial we will not use that. Unpack OpieSDK.tar.bz2 in your sources cd ${SOURCES}/opie directory. cd ${SOURCES}/opie tar -xjvf OpieSdk.tar.bz2 It creates a directories structure ${SOURCES}/opie/opt/OpieSDK. Inside that directory a script is present to start_kdevelop. Modify this script so that it uses the correct paths for you setup. #!/bin/sh source ${SOURCES}/opie/opt/OpieSdk/dev_env export KDEDIR=${SOURCES}/opie/opt/OpieSdk/kde export PATH=${SOURCES}/opie/opt/OpieSdk/kde/bin:$PATH kbuildsycoca kdevelop Save the script. Do the same with the script arm_source source ${SOURCES}/opie/opt/OpieSdk/dev_env export QTDIR=$QTDIR_ARM export OPIEDIR=$OPIEDIR_ARM Save the script and modify the script host_source in the same manner as above. source ${SOURCES}/opie/opt/OpieSdk/dev_env export QTDIR=$QTDIR_NAT export OPIEDIR=$OPIEDIR_NAT Save the script and modify the script dev_env in the same manner as above. export PYTHONPATH=${SOURCES}/opie/opt/OpieSdk/python/opie:${SOURCES}/opie/opt/OpieSdk/python/sip export PATH=/usr/local/arm/2.95.3/bin:/opt/OpieSdk/host_tools:${SOURCES}/opie/opt/OpieSdk/opie/x86/qt-2.3.7/bin:$PATH export PATH=${SOURCES}/opie/opt/OpieSdk/opie/x86/qmake:$PATH export QTDIR_NAT=${SOURCES}/opie/opt/OpieSdk/opie/x86/qt-2.3.7 export OPIEDIR_NAT=${SOURCES}/opie/opt/OpieSdk/opie/x86/sdk export QTDIR_ARM=${SOURCES}/opie/opt/OpieSdk/opie/arm/qt-2.3.7 export OPIEDIR_ARM=${SOURCES}/opie/opt/OpieSdk/opie/arm/sdk export OPIE_SDK_BASE=${SOURCES}/opie/opt/OpieSdk/ export OPIE_SDK_QMAKE_BASE=${SOURCES}/opie/opt/OpieSdk/opie/x86/sdk/mkspecs/qws/ export OPIE_DOC=${SOURCES}/opie/opt/OpieSdk/apidocs export LD_LIBRARY_PATH=${SOURCES}/opie/opt/OpieSdk/sip/lib:$OPIEDIR_NAT/lib:$QTDIR_NAT/lib:$LD_LIBRARY_PATH export OPIE_LANGUAGES=de:en:cz:da:dk:es:fr:hu:it:ja:ko:lv:mk:nl:no:pl:pt:pt_BR:ru:sl:zh_CN:zh_TW The symbolic linke to the tool qmake points now to the wrong place. We need to fix this symbolic link. Here is the way to do that. cd host_tools ln -sf /home/jpsaman/src/opie/opt/OpieSdk/opie/x86/sdk/qmake/qmake qmake cd ../ Now it is time to fire up our development environment and start hacking in Opie.

Cross compiling libraries needed by vlc

Download to ${SOURCES}. When downloading source tarballs copy them to your ${SOURCES} directory. Each section is supposed to begin with cd ${SOURCES}.


It is not clean at all but did not found a better working method. Using it compiles well, but when linking with vlc there are problems !

/usr/local/arm/2.95.3/arm-linux/bin should contain the cross compiler without the prefix arm-linux-. tar -xvzf SDL-1.2.5.tar.gz cd SDL-1.2.5 ./configure --enable-release --target=arm-linux --host=arm-linux \ --disable-esd \ --prefix=/usr/local/arm/2.95.3/arm-linux/usr \ --x-includes=/usr/local/arm/2.95.3/arm-linux/usr/X11R6/include \ --x-libraries=/usr/local/arm/2.95.3/arm-linux/usr/X11R6/lib \ --disable-video-opengl export PATH=/usr/local/arm/2.95.3/arm-linux/bin:$PATH make && make install


tar -xvzf glib-1.2.10.tar.gz cd glib-1.2.10 CONFIG_SITE=../ ./configure \ --prefix=/usr/local/arm/2.95.3/arm-linux/usr make make install cd .. tar -xvzf gtk+-1.2.10.tar.gz cd gtk+-1.2.10 CONFIG_SITE=../ ./configure \ --prefix=/usr/local/arm/2.95.3/arm-linux/usr --with-glib=../glib-1.2.10 make make install


tar -xvzf ffmpeg.tar.gz cd ffmpeg ./configure --cpu=armv4l --cc=arm-linux-gcc --disable-mmx \ --prefix=/usr/local/arm/2.95.3/arm-linux/usr --enable-shared cd libavcodec make Vlc does not require that you install ffmpeg.


tar -xvzf mad-0.14.2b.tar.gz cd mad-0.14.2b ./configure --enable-release --target=arm-linux --host=arm-linux \ --disable-esd \ --prefix=/usr/local/arm/2.95.3/arm-linux/usr \ --x-includes=/usr/local/arm/2.95.3/arm-linux/usr/X11R6/include \ --x-libraries=/usr/local/arm/2.95.3/arm-linux/usr/X11R6/lib \ --disable-video-opengl export PATH=/usr/local/arm/2.95.3/arm-linux/bin:$PATH make

gpe tremor

Tremor is an integer decoder for the vorbis audio codec. Download the source through CVS at the website.

Log into CVS using the password : anoncvs. cvs -d login cvs -d co Tremor cd Tremor CONFIG_SITE=../ ./configure \ --prefix=/usr/local/arm/2.95.3/arm-linux/usr make


For ogg, it is the same as Tremor. cvs -d login cvs -d co ogg cd ogg CONFIG_SITE=../ ./configure \ --prefix=/usr/local/arm/2.95.3/arm-linux/usr make


tar -xvzf flac-1.1.0.tar.gz cd flac-1.1.0 ./configure --enable-release --host=arm-linux --target=arm-linux \ --prefix=/usr/local/arm/2.95.3/arm-linux/usr It will probably fail (due to the xmms plugin), but it is not a problem, we will continue installation by hand. cp -Rf include/FLAC /usr/local/arm/2.95.3/arm-linux/include cd src/libFLAC make install


tar -xvzf libdvbpsi-0.1.2.tar.gz cd libdvbpsi-0.1.2 ./bootstrap ./configure --target=arm-linux --host=arm-linux make


tar -xvzf a52dec-0.7.4.tar.gz cd a52dec-0.7.4 ./configure --enable-release --host=arm-linux --target=arm-linux \ --prefix=/usr/local/arm/2.95.3/arm-linux/usr make && make install

Cross compiling vlc itself

First of all, run the ./bootstrap script. Then run one of the ipkg/rules.*, according to what you want to compile. Finally you just have to type make and you'll get a stand alone vlc.

Run arm-linux-strip to remove symbols and so the size of the file, and now you can test it easily on your PDA.

Enjoy !