In the end you would build your compiler directly in assembler, so no compiling would be needed.
But if you run your compiler on compromised hardware it would still be possible to insert a backdoor in your programs without you knowing.
To mitigate this vector you would be required to build your own chips... with self developed and assembled machines all the way down starting at growing your own silicon crystals.
I'm in the name after location and function fraction. All but my printer, he's named Cthulhu because printers are a menace to humanity and it supports wake-on-LAN.