I don't understand why, but starting over with host Ubuntu 20.04 works fine.
Someone posted that on another forum, but that didn't make sense to me. And, since it takes a LONG time to recompile everything that's needed to get to the link stage, I was hesitant to even try. Seemed like all I should need was the right toolchain.
But, spent a couple of days trying various gcc and g++ versions, including the version on the target (Bullseye aarch rpi) and the version on Ubuntu 20.04 on the Ubuntu 22 host.
I followed the guide exactly--on Ubuntu 22 there were several issues I was able to work-around just to get to the "show-stopper" at link time.
On Ubuntu 20.04, worked first time, zero issues!
Go figure.
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