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You'll get "redacted"

Yes, you can go out of your way to make your builds non-deterministic. That should break in Make as well.

I don't know enough about bazel to answer your question definitively, but "stamping" is what you want to search for.

The better question is, what if you change a comment?

It checksums the preprocessed files, so neither `__DATE__`, no comment changes should affect your build times.

I think __DATE__ without redaction pushes the dependency change 1 level down, to the .o file.

The .a/.so/.exe would no longer match the inputs (the .o files), causing a re-link.