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Last pushed: 2 years ago
Short Description
Docker Build for Cling (C++ Interpreter)
Full Description

Docker Build for Cling (C++ Interpreter)

  • Dockerized build of CERN's Cling.
  • Based on Ubuntu 14.04. (can be changed in the Dockerfile)


  1. Install docker
  2. Get the image from Docker Hub or build it yourself
  3. Use it like any other docker image

Get the Image from Docker Hub

# get the build from docker hub
docker pull maddouri/cling-ubuntu-docker
# run it ! (the entry point is cling)
docker run -it maddouri/cling-ubuntu-docker

Build It Yourself

# get the Dockerfile
git clone
cd cling-ubuntu-docker
# depending on your machine, this might take a while to finish building
docker build -t my_cling_image .
# run it ! (the entry point is cling)
docker run -it my_cling_image


Defining Aliases

alias cling='docker run -it maddouri/cling-ubuntu-docker'

Accessing the Host's File System

As with any other Docker images, you can access your file system from the container by attaching volumes to it:


docker run -v /path/to/host/folder:/path/to/container/folder -it maddouri/cling-ubuntu-docker

Usage example:

$ ls /media/data/myCode

$ cat func.cpp
#include <iostream>
void sayHi() {
    std::cout << "Hello Dockerized Cling !" << std::endl;

$ docker run -v /media/data/myCode:/code -it maddouri/cling-ubuntu-docker
****************** CLING ******************
* Type C++ code and press enter to run it *
*             Type .q to exit             *
[cling]$ .L /code/func.cpp
[cling]$ sayHi()
Hello Dockerized Cling !
[cling]$ .q
$ # back to the host machine

Using Pipes

# NB: use "-i" instead of "-it" when piping
echo -e '#include <iostream>\n std::cout <<  "Hello Dockerized Cling !" << std::endl;' | docker run -i maddouri/cling-ubuntu-docker

Run Bash in the Container

# use bash as the new entry point
docker run -it --entrypoint=/bin/bash maddouri/cling-ubuntu-docker

Why ?

Due to an issue, I couldn't get a precompiled version of cling for my Ubuntu 16.04 machine, neither did the current sources compile on my platform. (GCC 5 not supported)

Which Version of Cling is Available in the Docker Image ?

When building an image, clones the latest commit available from CERN's repository.

The exact commit SHA1 can be found in the ${CLING_COMMIT_SHA1} file:

docker run -it --entrypoint=/bin/bash maddouri/cling-ubuntu-docker

Automated Builds

After trying both Docker Hub's "Automated Builds" and Travis CI, it turns out that the images can't be built using those services -- in both cases, the build requires more time than the allowed amount.

For this reason, I will be pushing non-automated builds to Docker Hub. (until I figure out a better solution)


The content of the Github repository is available under the 3-Clause BSD license.

However, cling, llvm and clang (i.e. in the built docker image) have different licenses.

IANAL, so if the content of this repository does not comply with a given license, please contact me or create a Github issue in order to fix that :)

Docker Pull Command