View source for Toolchain

From Openmoko

Jump to: navigation, search

You do not have permission to edit this page, for the following reasons:

  • The action you have requested is limited to users in the group: Administrators.
  • You must confirm your email address before editing pages. Please set and validate your email address through your user preferences.

You can view and copy the source of this page:

Templates used on this page:

Return to Toolchain.

Personal tools


A toolchain is a set of tools that allows you to compile code. For Openmoko, we have to differentiate between the following use-cases:

Developing a single application

For this, you should use a prebuilt toolchain from the Openmoko project. Here you can find a recipe to get started with this toolchain leading you through a series of steps to compile a project and run it on your target device. You might have heard about OpenEmbedded, however as an application programmer, you should not be using OpenEmbedded.

System Integration and customizing a distribution

For this task, you should use OpenEmbedded which builds its own cross compiler during the bootstrapping/build process. System Integration and customizing a distribution is out of scope of this page.

Basic toolchain usage


You should be reasonably familiar with Linux and its command line tools, have an x86-compatible computer with at least 1G of free disk space. You should have experience with compiling programs from source using your local compiler. The remainder of this document will also assume you have write access in your home directory (~) and /usr/local/ (becoming root if needed). If any of this is not the case, please call your local administrator for help.

Last but not least you should have a working setup that allows you to compile native software packages using the autotools build system (the triade of ./configure, make, make install).

A (partial) list of required packages -- please append as necessary:

  • For most Linux version you might only need to install the packages
    • autoconf, automake
    • binutils, gcc, gcc-c++
    • libtool
    • ccache
    • intltool
  • For Ubuntu 8.04 ( Previous versions don't support libmokoui2 ) the following is required:
sudo apt-get install gcc g++ autoconf automake binutils libtool libglib2.0-dev \
ccache libxrender-dev intltool libmokoui2-dev libgconf2-dev mtools
  • For Fedora-Core the following is required, while logged in as root:
yum install gcc gcc-c++ autoconf automake binutils libtool glib2-devel \
ccache libXrender-devel intltool GConf2-devel mtools

Fedora-Core does not appear to have libmokoui2 available.

Downloading and installing

NOTE: Debian and Ubuntu i386 users (or others who can install a .deb) may wish to skip the below and instead use:

Openmoko application development in 5 minutes by Andreas Dalsgaard.

The prebuilt toolchain can be downloaded from

  • Creating a destination directory can be anywhere, but for example:
 mkdir ~/sources
 cd ~/sources
  • Depending on your CPU type (x86_64 or i686) download the proper package:
NOTE: Several people have had problems with the latest toolchain built 20080521. If you experience errors, try an older version. (as of July 23, 2008)

Next, you want to extract it on your filesystem. This toolchain is not relocatable, it needs to be installed into /usr/local/openmoko/. Now you have the following options:

  • Extract it directly as root, so use command "su" first (or prefix the tar command with "sudo" when you are using Debian/Ubuntu):
  cd /
  tar -xjvf ~/sources/openmoko-XYZ-arm-linux-gnueabi-toolchain.tar.bz2
  • On Debian-based systems, you can use alien(+fakeroot) to create an easy-to-uninstall package from this .tar.bz2:
  bunzip2 openmoko-*-arm-linux-gnueabi-toolchain.tar.bz2
  gzip openmoko-*-arm-linux-gnueabi-toolchain.tar
  fakeroot alien -d openmoko-*-arm-linux-gnueabi-toolchain.tar.gz
  sudo dpkg -i openmoko_*-arm-linux-gnueabi-toolchain*.deb
  • The prebuilt toolchain is for x86_64 or i686. If you wanted, you could build it on your own with OE:
  bitbake meta-toolchain-openmoko

Finally, everytime you want to use this toolchain, you need to alter some environment variables, so that your tools will be found. The toolchain provides a script to do that, so the only thing you need to do is to source it. Note that if you are not using a "sh" or "bash" shell (check with "echo $SHELL") that you need to start "sh" or "bash" first.

. /usr/local/openmoko/arm/setup-env
  • At least, you should add /usr/local/openmoko/arm/bin to your $PATH variable, otherwise the next steps won't work (om-conf and make).

Building OpenMoko Kernel from git repo using Toolchain

git clone git:// linux-2.6
cd linux-2.6
git checkout origin/stable
cp defconfig-gta02 .config

Will fail with error message "arm-angstrom-linux-gnueabi-ld: unrecognized option '-Wl,-rpath-link,/usr/local/openmoko/arm/arm-angstrom-linux-gnueabi/lib'" until /usr/local/openmoko/arm/setup-env is modified. LDFLAGS should be changed from:

export LDFLAGS="-L${OMTOOL_DIR}/arm/arm-angstrom-linux-gnueabi/lib -Wl,-rpath-link,${OMTOOL_DIR}/arm/arm-angstrom-linux-gnueabi/lib -Wl,-O1"


export LDFLAGS="-L${OMTOOL_DIR}/arm/arm-angstrom-linux-gnueabi/lib -rpath-link ${OMTOOL_DIR}/arm/arm-angstrom-linux-gnueabi/lib -O1"

Building a sample project

In a chosen destination directory (in this example ~/):

  • copy the downloaded sample application source:
cp -r /usr/local/openmoko/source/openmoko-sample2 ~/
  • Remember to set the proper environment variables (again with "sh" or "bash") for openmoko:
. /usr/local/openmoko/arm/setup-env
  • You need to create a build configuration for this application. This also checks if all needed libraries, tools, etc.. is available on your system. If this fails see the notes about the needed packages in the section "Prerequisites" mentioned earlier.
om-conf openmoko-sample2
  • Optionally now you can modify the source code in openmoko-sample2/src. Before the next step, go into the sample directory.
cd openmoko-sample2
  • If you are using an older version of the toolchain, you may have to create the makefile by running "./". Otherwise, to build the application from the source code just type:
  • If there are errors (i.e. "You need to install gnome-common from the GNOME CVS") deal with them. Also see "Troubleshooting" section at the end of this page for known issues.

If you want to install this project on host for staging usage later, a shared library, for example, you can do the following to install it into a given configured prefix.

PKG_CONFIG_PATH="PKG_CONFIG_PATH:/usr/lib/pkgconfig" om-conf --prefix=/usr/local/openmoko openmoko-sample2
cd openmoko-sample2
make install

How to modify the sample project

In order to build your own project by using openmoko-sample2 files, some changes are needed:

  • copy the downloaded sample application source
cp -r /usr/local/openmoko/source/openmoko-sample2 ~/

  • rename the folder with the name of your project (in this example your-project-name) and delete old sample files
mv openmoko-sample2 your-project-name
cd your-project-name
cd src
rm *.c
  • copy your sources (in this example your-sources) into src/
cp your-sources .
cd ..
  • now in the main folder modify by updating the following lines
  • modify by updating the following lines ('main.c' should be the main file in your project)
AC_INIT(your-project-name, 0.0.1,    
  • go into data/ folder and rename these files with the name of your project
cd data
mv openmoko-sample.png your-project-name.png
mv openmoko-sample.desktop your-project-name.desktop
  • modify inside data/ by updating the following lines
dist_desktop_DATA = your-project-name.desktop
dist_appicon_DATA = your-project-name.png
  • modify inside data/ by updating the following lines
dist_desktop_DATA = your-project-name.desktop
dist_appicon_DATA = your-project-name.png
  • modify your-project-name.desktop by updating the following lines
  • and by adding the following line
  • move into src/ folder
cd ..
cd src
  • modify by updating the following lines
bin_PROGRAMS = your-project-name	
your_project_name_SOURCES = \				
your_project_name_LDADD  = @DEPENDENCIES_LIBS@
  • be sure to put instead of main.c all your .c and .h files and modify all the '-' characters with '_' in the variable names

Packaging your application

We have included a script to make an ipkg out of your application. Note that this is not needed to test your application on the Neo (for that you can just scp the resulting binary and data over), however it's very handy if you want to distribute your application to others.

om-make-ipkg openmoko-sample2

Now you got openmoko-sample2_0.1_armv4t.ipk , you can `scp' it to your Neo and install it:

scp openmoko-sample2_0.1_armv4t.ipk root@
ssh root@ opkg install openmoko-sample2_0.1_armv4t.ipk

Note that while you can redistribute the generated ipkg, be aware that this is a bare-bones ipk that contains no further information, i.e. you will lack library dependencies. See below how to fix this.

You can also supply the version number, a description, and an author / contacts string in a control file:

om-make-ipkg myapp myapp_control

A template of myapp_control:

Package: $appname
Version: 0.1
Description: package built by openmoko toolchain
Section: openmoko/applications
Priority: optional
Maintainer: $USER
Architecture: armv4t
Source: ${SRC}

Where to go from here

Using the external toolchain is an easy way to build applications for your Neo. If you are familiar with this procedure, you might also want to look into

Advanced topics

Using toolchain provided libraries

Add the necessary libraries to the _LDADD field in src/, for example:

openmoko_sample2_LDADD  = @DEPENDENCIES_LIBS@ -lmokogsmd2

make sure to run om-conf again after this.

Installing additional libraries into the toolchain

Sooner or later you will want to compile an application that has dependencies which can't be fulfilled by the precompiled toolchain, e.g. some obscure libraries.

In that case, feel free to request the inclusion of additional libraries into the next release of the OpenMoko toolchain. Until then, here is how you enhance your already installed toolchain. Say, we want to add the library called liburiparse:

cd ~/source
./configure --host=arm-angstrom-linux-gnueabi \
make install

That's it.

Getting your application packaged by OE

If you have written a cool application which you want to share with others, the best way to do that is to

  1. upload your application source code to a public location
  2. submit a BitBake recipe to OpenEmbedded, preferably via the OpenEmbedded bugtracker.

See also Customizing the Openmoko Distribution.


  • Some Versions of the Toolchain have corrupt .la files. If you compile an application using the Toolchain and you receive a '/space/fic/openmoko-daily/neo1973/work/armv4t-angstrom-linux-gnueabi/pango-1.18.3-r0/pango-1.18.3/pango/' error, you are affected. To fix that you should go to your "/usr/local/openmoko/arm/arm-angstrom-linux-gnueabi/usr/lib" directory and open the affected .la files and change "/space/fic..." to "/usr/local/openmoko/arm/arm-angstrom-linux-gnueabi/usr/lib". You have to fix more than one .la file. For the pango error you have to change "", but there are more corrupt .la files.