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BuildingCompilers.md

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Building compilers

Compiler Explorer builds its compilers using docker images. These images are each contained in their own Git Repos. The images are auto-built by Docker Hub on git checkins.

Daily images

There's an AWS instance (see setup-builder.sh) that is left shut down most of the time. It's used to build new compilers. Daily compilations are orchestrated via the admin node. It runs the admin-daily-build.sh on a daily schedule via cron (see crontab.admin). This script fires up the builder node, runs the various builds on it, and shuts down. The same crontab also updates the symlinks in /opt/compiler-explorer daily to point at the newest builds.

New compilers

New compilers are built by logging into the admin node (with ce admin), and then manually starting the build node (ce builder start).

Then compilations can be run with commands like:

ce builder exec -- \
  sudo docker run --rm --name clang.build \
    -v/home/ubuntu/.s3cfg:/root/.s3cfg:ro compilerexplorer/clang-builder \
    bash build.sh 6.0.0 s3://compiler-explorer/opt/

A clang build takes around 20 minutes.

Don't forget to shut the build node down with ce builder stop when you've finished!

Remember that after building a compiler you'll need to update the update_compilers/install_compilers.sh script to install it. And if you're updating an existing compiler, you'll need to do something like unpacking the compiler to the admin drive's /tmp/ and then rsync --delete-after -avz /tmp/compiler/ /opt/compiler-explorer/compiler/.