Found the following significant warnings:
  reg-lib/cpu/_reg_maths.cpp:127:93: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:127:97: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:127:103: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:127:107: warning: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:240:97: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:240:101: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:240:107: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:240:111: warning: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:266:97: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:266:101: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:266:107: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:266:111: warning: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:297:97: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:297:101: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:297:107: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:297:111: warning: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:319:97: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:319:101: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:319:107: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths.cpp:319:111: warning: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths_eigen.cpp:193:71: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
  reg-lib/cpu/_reg_maths_eigen.cpp:193:75: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'long long unsigned int'} [-Wformat=]
See 'd:/Rcompile/CRANpkg/local/4.3/RNiftyReg.Rcheck/00install.out' for details.