One of the benefits of this new QBE feature of supporting windows could be that this allows a language like Hare to be used for windows too, all the more power to Hare and other programming languages built on top of QBE!
The Linux kernel ABI, while stable, is not simpler than libc and not portable at all. You can build the modern computing environment on mingw.
However, if they chose to target Linux–only to show how low–level Hare is, that's understandable as well —no shade.
To take it to its logical conclusion, they're saying libc will be a package you install on your Hare/Linux system for compatibility with obsolete systems, which to me implies willingness to work on ports to other platforms —you're not going to replace libc otherwise.
The main issue on that OS is that it is neither ABI or API stable.
https://github.com/graemeg/blaise
Having Blaise work on Windows, could be interesting... Though of course only in the long tail of already built Delphi apps... that still have source.... that are reasonably written... that don't rely on now unsupported libraries...
Hmmm... Ah yes. These may be some of the reasons people might not do Delphi as much anymore. Still, Delphi was great for me and helped me get a mortgage and things like that.
The Blaise author is progressing his development along nicely using QBE for the compiler. To me, Blaise looks like a team progressing things nicely, but I think it's mostly the original author.
Blaise could be a neat Pascal compiler with a great deal of old cruft cleaned out and is quite quick.
Ada, as it continues to evolve as ISO standard, and there is an official open source compiler (among 7 vendors), and Modula-2 as it got added to the set of GCC frontends, and being the language Wirth actually designed for systems stuff (the uppercase keywords are a downer if not using a proper IDE though).
Naturally Delphi still has lots of goodies.