You would think so, but after close to 10 years as a package maintainer it's clear to me that people don't know how make works when you do start doing anything else than `-j1`.

The gcc compiler also fails to reproduce binaries with the LTO streamer backend if you use certain macros. This has the consequence of making cgo binaries unreproducible.

As for Debian, we don't really know how many packages are reproducible. The CI they show is for fuzzing out issues, there are no system currently reproducing distributed packages.

Usually they aren't because of timestamps, processor features etc. After quite a bit of work Debian is now at 96% (or 93% when varying a few more things)

https://tests.reproducible-builds.org/debian/reproducible.ht...