Found the following significant warnings:
  assign.c:470:83: warning: format specifies type 'int' but the argument has type 'R_xlen_t' (aka 'long') [-Wformat]
  assign.c:518:22: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  assign.c:794:96: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  forder.c:107:30: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:121:19: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:255:27: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:270:23: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:272:21: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:283:18: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:284:23: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:304:25: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:322:17: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:340:14: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:404:3: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:426:7: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:428:7: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:430:7: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:443:5: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:445:5: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:447:5: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:453:7: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:455:7: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:459:5: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:462:5: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:465:5: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:467:5: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:495:5: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:511:9: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:553:7: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:599:11: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:706:8: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:720:47: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:725:57: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:1045:36: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:1154:15: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:1261:38: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:1265:57: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:1270:29: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:1302:7: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:1315:29: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:1332:7: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  forder.c:1366:9: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  fread.c:1888:54: warning: format specifies type 'int' but the argument has type 'int64_t' (aka 'long') [-Wformat]
  fsort.c:168:102: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  fsort.c:245:49: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  fsort.c:249:54: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  fwrite.c:626:28: warning: format specifies type 'int' but the argument has type 'const void *' [-Wformat]
  fwrite.c:711:68: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  fwrite.c:731:15: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  fwrite.c:746:64: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  fwrite.c:814:10: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  fwrite.c:825:10: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  fwrite.c:915:21: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  gsumm.c:90:38: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  gsumm.c:90:48: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  gsumm.c:90:56: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  gsumm.c:90:67: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  gsumm.c:609:90: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  gsumm.c:612:93: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  gsumm.c:638:92: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  gsumm.c:1411:72: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  ijoin.c:323:89: warning: data argument not used by format string [-Wformat-extra-args]
  init.c:153:139: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:168:71: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:169:77: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:171:83: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:172:106: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:173:105: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:173:119: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:174:81: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:175:79: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:176:87: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:177:77: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:178:79: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:179:79: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:180:81: warning: format specifies type 'int' but the argument has type 'unsigned long' [-Wformat]
  init.c:184:95: warning: format specifies type 'int' but the argument has type 'R_xlen_t' (aka 'long') [-Wformat]
  rbindlist.c:212:37: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  rbindlist.c:233:50: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  rbindlist.c:234:48: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  rbindlist.c:494:31: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  reorder.c:17:115: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  reorder.c:27:136: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]
  snprintf.c:217:136: warning: format specifies type 'char *' but the argument has type 'int' [-Wformat]
  subset.c:270:26: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
See ‘/data/gannet/ripley/R/packages/tests-clang/data.table.Rcheck/00install.out’ for details.
* used C compiler: ‘clang version 17.0.5’