buildinfo question

[James Addison]

Hi folks,

As Debian's buildinfo[1] wiki page hints, it's difficult to determine
whether a build dependency is genuinely required at build-time,
compared to: it was required in the past, but has become dependency
cruft.

I was wondering: are there reproducible-builds efforts underway (in
Debian or other ecosystems) to determine the packages that were
involved (first-pass approximation: at least one file belonging to the
package was read from the filesystem by a child of the build process
-- anything else?) during a reproducible package build?

Thanks,
James

[1] - https://wiki.debian.org/ReproducibleBuilds/BuildinfoFiles