What languages are more suited for long term projects (will have to be recompiled in 20 years, with the minimum amount of changes in the source code), in terms of minimal amount of rewriting what's already written due to changing of the versions of the language & changing of compilers & OSs (i.e. backward compatibility), as far as we can judge from past references?
(we can't tell what the future will bring, so no predictions here - just base your answer on so far known ones)
IMHO, yes, *nix oriented ones will have some advantage in here.
Perl (good, AFAIK), vs.
Python (bad with it's v2.5 -> v3.x rather large backward compatibility breakup - it has also been said that back compatibility will not be kept in future versions).
If you could explain your arguments as to why did you choose a particular language, along with what were the larger changes in it.