Time and date are... tolerable. There's SOURCE_DATE_EPOCH which should always be set to whack it into submission when used. ASLR of the _compiler being invoked_ resulting in a difference in the _program being compiled_ is nuts and would break any self-hosting compiler with consistency checks.

ASLR is important, but you should be able to provide the random seed (I don't know if it's possible or not)

Explicit is Better than Implicit.