Found the following significant warnings:
  dataStore.cpp:271:8: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  dataStore.cpp:292:12: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  dataStore.cpp:298:10: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  dataStore.cpp:353:16: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  dataStore.cpp:363:14: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  dataStore.cpp:372:16: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  dataStore.cpp:451:6: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  dataStore.cpp:470:9: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  dataStore.cpp:818:5: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  dataStore.cpp:911:9: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1326:2: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1333:5: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1337:5: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1338:5: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1356:9: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1358:2: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1372:4: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1378:4: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1389:4: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1398:6: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1402:6: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1411:4: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1417:5: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1423:5: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1428:5: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1444:6: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1446:6: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1448:6: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1453:5: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1470:5: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1472:5: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  rndforest.cpp:1474:6: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
  utils.cpp:464:7: warning: ignoring return value of function declared with 'warn_unused_result' attribute [-Wunused-result]
See '/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/CORElearn.Rcheck/00install.out' for details.