foo &= EvenOddPrecOvDWFermActArrayEnv::registered;
bool linkage_hack(){  bool foo = true;  // 4D actions  foo &= EvenOddPrecWilsonFermActEnv::registered;  foo &= UnprecWilsonFermActEnv::registered;  // 5D actions  foo &= EvenOddPrecDWFermActArrayEnv::registered;  foo &= UnprecDWFermActArrayEnv::registered;  foo &= EvenOddPrecNEFFermActArrayEnv::registered;  foo &= UnprecNEFFermActArrayEnv::registered;    foo &= UnprecOvDWFermActArrayEnv::registered;  foo &= UnprecOvExtFermActArrayEnv::registered;  return foo;}