[pjkundert]

Check out Nix. Deterministic source derivations of pretty much anything you might want to build, trivially re-buildable from source by anyone. It takes seconds to install the "Nix Shell" on pretty much any of the modern OSes.

Now, to avoid the "Reflections On Trusting Trust" exploit, building the C compiler toolchain from known-good "root" compiler/linker toolchains, and then comparing the output vs. self-compilation is quite a bit harder.