Found the following significant warnings:
  assign.c:470:15: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘R_xlen_t’ {aka ‘long int’} [-Wformat=]
  assign.c:650:17: warning: format ‘%d’ expects a matching ‘int’ argument [-Wformat=]
  assign.c:794:21: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  assign.c:1142:13: warning: format ‘%p’ expects argument of type ‘void *’, but argument 4 has type ‘struct SEXPREC **’ [-Wformat=]
  assign.c:1142:13: warning: format ‘%p’ expects argument of type ‘void *’, but argument 5 has type ‘R_len_t *’ {aka ‘int *’} [-Wformat=]
  fread.c:1887:32: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘int64_t’ {aka ‘long int’} [-Wformat=]
  fsort.c:168:26: warning: format ‘%d’ expects argument of type ‘int’, but argument 5 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  fsort.c:245:17: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  fsort.c:249:17: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  fwrite.c:625:15: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘const void *’ [-Wformat=]
  fwrite.c:711:23: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  fwrite.c:746:18: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  fwrite.c:813:12: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  fwrite.c:824:14: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  gsumm.c:89:13: warning: format ‘%d’ expects argument of type ‘int’, but argument 6 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  gsumm.c:89:13: warning: format ‘%d’ expects argument of type ‘int’, but argument 7 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  gsumm.c:89:13: warning: format ‘%d’ expects argument of type ‘int’, but argument 8 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  gsumm.c:89:13: warning: format ‘%d’ expects argument of type ‘int’, but argument 9 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  gsumm.c:609:19: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long unsigned int’ [-Wformat=]
  gsumm.c:612:19: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long unsigned int’ [-Wformat=]
  gsumm.c:638:22: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long unsigned int’ [-Wformat=]
  gsumm.c:1411:19: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long unsigned int’ [-Wformat=]
  ijoin.c:323:22: warning: too many arguments for format [-Wformat-extra-args]
  init.c:153:33: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:168:33: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:169:36: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:171:39: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:172:59: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:173:47: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:173:47: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long unsigned int’ [-Wformat=]
  init.c:174:38: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:175:37: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:176:41: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:177:36: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:178:37: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:179:37: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:180:38: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
  init.c:184:35: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘R_xlen_t’ {aka ‘long int’} [-Wformat=]
  reorder.c:17:17: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  reorder.c:27:15: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  snprintf.c:217:93: warning: format ‘%s’ expects argument of type ‘char *’, but argument 3 has type ‘int’ [-Wformat=]
See ‘/home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/data.table.Rcheck/00install.out’ for details.
* used C compiler: ‘gcc-13 (Debian 13.2.0-5) 13.2.0’