So far never had problems with programs compiled with Tanner's 4.4 (also no reports of programs failing due to libstdc++ incompatibility, but sample size is unreliable at best). It does seem that bugs from 4.2 are quite common and workarounds for those are non-trivial (in some cases -Ox does impact succesfull compilation still).

@Estel: unlikely this would get full attention from CSSU team, as binutils (and rest of compilation packages) is not part of standard system setup. Currently it is even required to add 'risky' SDK repos to get 4.2 running.