Nothing per se. I was confused in that both Adacore and FSF offer a compiler with the same name but different licensing.
As to my specific situation, I cannot release source code and so the Adacore GPL licensed product is a no-go.
As to my specific situation, I cannot release source code and so the Adacore GPL licensed product is a no-go.
(I am not a lawyer; do not rely on my advice without thoroughly verifying it.)