We are maintaining a list [1] of the packages needing changes and rebuilds.
Many of the cases were identified by a FTBFS, only on ppc64el, in a dependency of the package needing the rebuild. In Ubuntu, "no-change rebuilds" are handled as sourceful uploads, with only a new changelog entry and the reason, instead of binNMUs. One of the advantages of this approach is that autopkgtests are triggered, sometimes exposing additional packages needing attention. Because of the relatively low number of rebuilds required, I suggest this approach also be taken in Debian, instead of the usual binNMUs. [1] https://wiki.debian.org/ToolChain/IEEELongDouble
