These instructions explain how Linux users set up their Cobalt development environment, fetch a copy of the Cobalt code repository, and build a Cobalt binary. Note that the binary has a graphical client and must be run locally on the machine that you are using to view the client. For example, you cannot SSH into another machine and run the binary on that machine.
Choose where you want to put the
depot_toolsdirectory, which is used by the Cobalt code. An easy option is to put them in
~/depot_tools. Clone the tools by running the following command:
$ cd ~/ $ git clone https://cobalt.googlesource.com/depot_tools
depot_toolsdirectory to the end of your
PATHvariable. We recommend adding something like this to your
Run the following command to install packages needed to build and run Cobalt on Linux:
$ sudo apt-get install build-essential coreutils git gperf \ libasound2-dev libavformat-dev libavresample-dev \ libdirectfb-dev libdirectfb-extra libpulse-dev \ libgl1-mesa-dev libgles2-mesa-dev libx11-dev \ libxcomposite-dev libxcomposite1 libxrender-dev libxrender1 \ libxpm-dev m4 ruby tar xserver-xephyr xz-utils yasm
Install the latest version of the standard C++ header files (
libstdc++). For example:
sudo apt-get install libstdc++-4.8-dev
bison-2.7. Note that this series of commands uninstalls any version of
bisonthat you already have installed to ensure that the desired version is installed.
$ sudo apt-get remove bison $ cd /tmp $ wget http://ftp.gnu.org/gnu/bison/bison-2.7.1.tar.gz $ tar zxf bison-2.7.1.tar.gz $ cd bison-2.7.1 $ sh configure && make && sudo make install $ which bison /usr/local/bin/bison $ bison --version bison (GNU Bison) 2.7.12-4996
Clone the Cobalt code repository. The following
gitcommand creates a
cobaltdirectory that contains the repository:
$ git clone https://cobalt.googlesource.com/cobalt
Modify your path to include the version of Clang that is downloaded in the next step of the instructions. The next step will return an error if this version of Clang is not in your path before it runs.
Build the code by navigating to the
srcdirectory in your new
cobaltdirectory and running the following command. You must specify a platform when running this command. On goobuntu, the canonical platform is
You can also use the
-Ccommand-line flag to specify a
build_type. Valid build types are
gold. If you specify a build type, the command finishes sooner. Otherwise, all types are built.
$ cobalt/build/gyp_cobalt [-C <build_type>] <platform>
Compile the code from the
$ ninja -C out/<platform>_<build_type> <target_name>
The previous command contains three variables:
<platform>is the platform configuration that identifies the platform. As described in the Starboard porting guide, it contains a
linux) and a
x64x11), separated by a hyphen.
<build_type>is the build you are compiling. Possible values are
gold. These values are also described in the Starboard porting guide under the required file modifications for the
<target_name>is the name assigned to the compiled code and it is used to run the code compiled in this step. The most common names are
cobaltbuilds the Cobalt app.
nplbbuilds Starboard's platform verification test suite to ensure that your platform's code passes all tests for running Cobalt.
allbuilds all targets.
ninja -C out/linux-x64x11_debug cobalt
This command compiles the Cobalt
debugconfiguration for the
linux-x64x11platform and creates a target named
cobaltthat you can then use to run the compiled code.
Run the compiled code to launch the Cobalt client:
# Note that 'cobalt' was the <target_name> from the previous step. $ out/linux-x64x11_debug/cobalt [--url=<url>]
The flags in the following table are frequently used, and the full set of flags that this command supports are in
Indicates that you want to use `http` instead of `https`.
Indicates that you want to connect to an
httpshost that doesn't have a certificate that can be validated by our set of root CAs.
Defines the startup URL that Cobalt will use. If no value is set, then Cobalt uses a default URL. This option lets you point at a different app than the YouTube app.