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.
Compilers are built using a Github workflow, running on our own builders, in the compiler-workflows repo.
Some legacy builds use a dedicated AWS instance (see setup-builder.sh) that is left shut down most of the time. These 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.
New compilers can be built by triggering a Github action build - use the Custom compiler build and then click "Run workflow". A clang build takes around 20 minutes.
Remember that after building a compiler you'll need to update the YAML configuration to install it.