> > If the old cluster used extensions those same extensions must be > > installed in the new cluster via installation procedures specific > > to, and documented by, each extension. For contrib extensions it is > > usually enough to install the -contrib package via the same method > > you used to install the PostgreSQL server. > > Well this is not strictly true. There are many extensions that would > work just fine with the current pg_upgrade. It may not even be > necessary to recompile them.
It is always necessary to recompile because of the PG_MODULE_MAGIC declaration, which is mandatory and contains a check that the major version matches. Copying the original shared object never works.
Thx, I knew I was on shaky ground with that last statement :)
