Has that attack ever been observed in the wild?

While I don't know if the current incarnations of Nix/Guix will succeed, I think we are slowly making progress towards reproducible builds everywhere.

No one knows for sure, though compromised compilers are not far fetched - there has been an implicit trust on compiler toolchains. Reproducible builds are a few years out from full general adoption.

Assembly code can be read to see if it matches.

> Has that attack ever been observed in the wild?

Yes: https://www.quora.com/What-is-a-coders-worst-nightmare/answe...

Also, I remember in the 90's, people talking about a virus that infect pascal source code files. Memory is spotty about it.

> While I don't know if the current incarnations of Nix/Guix will succeed, I think we are slowly making progress towards reproducible builds everywhere.

Fortunately, the answer is also positive here.

Not with Guix and Mes.

Reproducible builds make an attack like this as likely as "the whole world is a big conspiracy".