We currently test meta-mingw by building a SDK with it. This is a good start but doesn't verify that it *actually* works. We need a SDK test that actually installs the generated SDK and tries to build a binary with it. I suspect the easiest way to do this would be to use Wine to run the compiler as then we don't need a Windows machine but can run it as part of the standard QA process on the autobuilder.
CCing Josh as it appears he uses meta-mingw, so might have an interest in pushing this.
meta-mingw SDK is now tested on the aautobuilder as part of the "a-full" builds