[megous]

Have you ever been an upstream? What you're suggesting is awfully wasteful. You'd get endless requests for "please add build for XXX" if you ever distribute any binary. Where XXX is anything from arbitrary versions of arbitrary distribution, or any kind of non-linux OSes. And all that for i686, x86_64, various ARMs,... Who has time for that? If you state you only distribute source code and perhaps binary for Windows, you will not get bothered ever again.

Better let the building be done by people who are doing building all day en masse for a single arch, or have infrastructures set up to do builds for multiple archs easilly, than to expect every upstream to have this setup.