Found the following significant warnings:
  Gprop-odds-subdist.c:534:31: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  Gprop-odds-subdist.c:569:44: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  Gprop-odds.c:529:31: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  Gprop-odds.c:564:44: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  breslow.c:206:21: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  breslow.c:262:60: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  breslow.c:320:46: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  breslow.c:670:12: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  comprisk.c:833:10: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  cox-aalen-lwy-resamp.c:742:71: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  cox-aalen-lwy-resamp.c:766:57: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  cox-aalen.c:964:69: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  cox-aalen-stratum.c:754:71: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  cox-aalen.c:996:57: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  cox-aalen-stratum.c:781:57: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  ipcw-residualmean.c:471:14: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  pred.c:142:17: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  pred.c:157:14: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-excess.c:159:42: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-excess.c:220:65: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-excess.c:329:20: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-excess.c:372:68: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-excess.c:437:40: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-excess.c:584:33: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-excess.c:656:18: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-excess.c:680:30: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-excess.c:733:17: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-excess.c:738:40: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-odds-subdist2.c:569:31: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-odds-subdist2.c:591:44: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-odds.c:496:31: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  prop-odds.c:518:44: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  timecox.c:144:23: warning: invalid UTF-8 in comment [-Winvalid-utf8]
  timecox.c:307:14: warning: invalid UTF-8 in comment [-Winvalid-utf8]
See ‘/data/gannet/ripley/R/packages/tests-clang/timereg.Rcheck/00install.out’ for details.