Found the following significant warnings:
  ./crit.h:1272:20: warning: enumeration value 'NoCrit' not handled in switch [-Wswitch]
  ./crit.h:1358:20: warning: enumeration value 'NoCrit' not handled in switch [-Wswitch]
  ./crit.h:1554:20: warning: enumeration value 'NoCrit' not handled in switch [-Wswitch]
  ./crit.h:1641:20: warning: enumeration value 'NoCrit' not handled in switch [-Wswitch]
  ./dist.h:312:12: warning: enumeration value 'NotUsed' not handled in switch [-Wswitch]
  ./dist.h:524:20: warning: enumeration value 'NotUsed' not handled in switch [-Wswitch]
  ./extended.h:293:20: warning: enumeration value 'NotUsed' not handled in switch [-Wswitch]
  ./extended.h:734:20: warning: enumeration value 'NotUsed' not handled in switch [-Wswitch]
  ./impute.h:557:12: warning: enumeration value 'Prop' not handled in switch [-Wswitch]
  ./impute.h:583:12: warning: enumeration value 'Same' not handled in switch [-Wswitch]
  ./isoforest.h:620:20: warning: enumeration value 'Fail' not handled in switch [-Wswitch]
  ./isoforest.h:684:20: warning: enumeration value 'Fail' not handled in switch [-Wswitch]
  ./mult.h:777:20: warning: enumeration value 'Divide' not handled in switch [-Wswitch]
  ./mult.h:959:20: warning: enumeration value 'Divide' not handled in switch [-Wswitch]
  ./predict.h:491:40: warning: enumeration value 'Weighted' not handled in switch [-Wswitch]
  ./predict.h:445:20: warning: enumeration value 'NotUsed' not handled in switch [-Wswitch]
  ./predict.h:717:48: warning: enumeration value 'Random' not handled in switch [-Wswitch]
  ./predict.h:581:20: warning: enumeration value 'NotUsed' not handled in switch [-Wswitch]
  ./predict.h:909:24: warning: enumeration value 'NotUsed' not handled in switch [-Wswitch]
  ./extended.h:462:12: warning: enumeration value 'NotUsed' not handled in switch [-Wswitch]
  sql.cpp:310:12: warning: enumeration value 'NotUsed' not handled in switch [-Wswitch]
  sql.cpp:483:16: warning: enumeration value 'NotUsed' not handled in switch [-Wswitch]
See '/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/isotree.Rcheck/00install.out' for details.