CMake 3.30: Ignore SM 10.0+

The legacy CMake logic we have fails the moment that CUDA
Toolkit advertises SMs >= 10.0. While we work on a
modernization, this breaks all CUDA builds, even for older SMs.

Exclude newer SMs for now from our build logic.

Author: ax3l

Tools/CMake/AMReXUtils.cmake

@@ -222,15 +222,22 @@ endfunction ()
 function (convert_cuda_archs  _cuda_archs)
 
    foreach (_item IN LISTS ${_cuda_archs})
+      # remove -real suffixes
+      string(REGEX REPLACE "\\-real$" "" _item "${_item}")
+
       string(REGEX MATCH "\\." _has_decimal "${_item}")
-      string(REGEX MATCH "[0-9]+" _is_number "${_item}")
+      string(REGEX MATCH "^[0-9]+\\.?[0-9]*$" _is_number "${_item}")
 
       if (NOT _has_decimal AND _is_number)
          math(EXPR _int "${_item}/10" OUTPUT_FORMAT DECIMAL)
          math(EXPR _mod "${_item}%10" OUTPUT_FORMAT DECIMAL)
-         list(APPEND _tmp "${_int}.${_mod}")
+         if(_int LESS 10)  # CMake 3.30 does not support SM 10.0+ in cuda_select_nvcc_arch_flags
+             list(APPEND _tmp "${_int}.${_mod}")
+         endif()
       else ()
-         list(APPEND _tmp ${_item})
+         if(_item LESS 10)  # CMake 3.30 does not support SM 10.0+ in cuda_select_nvcc_arch_flags
+            list(APPEND _tmp ${_item})
+        endif()
       endif()
    endforeach ()