Found the following significant warnings:
  bayesxsrc/bib/data.cpp:939:36: warning: ISO C++20 requires return type of selected 'operator==' function for rewritten '!=' comparison to be 'bool', not 'int' [-Wrewrite-not-bool]
  bayesxsrc/bib/data.cpp:939:36: warning: ISO C++20 considers use of overloaded operator '!=' (with operand types 'value_type' (aka 'realob::realobs') and 'realobs') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
  bayesxsrc/bib/data.cpp:1385:16: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'realobs' and 'realobs') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
  bayesxsrc/bib/data.cpp:1578:16: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'realobs' and 'realobs') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
  bayesxsrc/bib/data.cpp:1596:20: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'realobs' and 'realobs') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
  bayesxsrc/bib/data.cpp:1656:16: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'realobs' and 'realobs') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
  bayesxsrc/bib/data.cpp:1674:20: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'realobs' and 'realobs') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
  bayesxsrc/bib/vectorn.cpp:276:18: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'realob::realobs' and 'realob::realobs') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
  bayesxsrc/bib/vectorn.cpp:314:18: warning: ISO C++20 requires return type of selected 'operator==' function for rewritten '!=' comparison to be 'bool', not 'int' [-Wrewrite-not-bool]
  bayesxsrc/bib/vectorn.cpp:314:18: warning: ISO C++20 considers use of overloaded operator '!=' (with operand types 'realob::realobs' and 'realob::realobs') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
  bayesxsrc/bib/realvar.cpp:195:25: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'value_type' (aka 'realob::realobs') and 'realobs') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
  bayesxsrc/bib/realvar.cpp:205:25: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'value_type' (aka 'realob::realobs') and 'realobs') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
  bayesxsrc/dag/adjacency.cpp:832:26: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'Matrix<unsigned int>' and 'Matrix<unsigned int>') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
  bayesxsrc/psplines/fullcond_pspline_stepwise.cpp:485:35: warning: ISO C++20 considers use of overloaded operator '==' (with operand types 'datamatrix' (aka 'statmatrix<double>') and 'datamatrix') to be ambiguous despite there being a unique best viable function [-Wambiguous-reversed-operator]
See ‘/data/gannet/ripley/R/packages/tests-clang/BayesXsrc.Rcheck/00install.out’ for details.