Found the following significant warnings:
  ./lj_obj.h:185:4: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
  ./lj_obj.h:441:6: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
  ./lj_obj.h:442:4: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
  ./lj_ir.h:564:4: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
  ./lj_ir.h:575:4: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
  lj_obj.h:185:4: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
  lj_obj.h:441:6: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
  lj_obj.h:442:4: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
  lj_buf.h:28:4: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
  lj_ir.h:564:4: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
  lj_ir.h:575:4: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
  lj_cparse.h:36:4: warning: ISO C99 doesn't support unnamed structs/unions [-Wpedantic]
See 'd:/Rcompile/CRANpkg/local/4.2/luajr.Rcheck/00install.out' for details.