Essence: I need a confirmation that the testsuite setup as presented in:
https://github.com/abebeos/avr-gnu works fine. The problem with the avr target is that the testsuite cannot be run easily, mainly because of the need for a special simulated-target setup, which does not work for avr as documented. This led developers to a dead-end with their non-cc0-avr-backends (the non-cc0 backend is needed thus avr is not dropped from gcc11). I integrated a toolchain/testsetup to be able to run the gcc testsuite against a simulated avr target. I then used this toolchain to test 2 different existent non-cc0-avr-backends (from pipcet and saaadhu, both github). The result is that saaadhu's backend seems to be working 100%. It has identical testsuite results with the existing (but deprecated) cc0-backend, which means that it can be used "as-is" for inclusion in gcc11. Please note that I did this work in context of a bounty @ bountysouce, more information within the issue: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92729#c35
