Travis is a open source continuous integration service which works together with GitHub. When the GitHub mirror is updated (or a pull request generated) Travis will kick of a build across a matrix of configurations. It will also run "make check" on the final build to run our set of unit tests.
You can see the current status of the qemu build at:
The Travis build environment is limited to a few configurations:
As a result it doesn't fully exercise the build system in the way our Buildbot used do. Fortunately patchew fills in the gaps.
See the Travis config file