GPU CMake: Raise required CUDA version to 12.6

Author: davidrohr

dependencies/FindO2GPU.cmake

@@ -105,8 +105,8 @@ if(ENABLE_CUDA)
       message(${FAILURE_SEVERITY} "CUDA found but thrust not available")
       set(CMAKE_CUDA_COMPILER OFF)
     endif()
-    if (NOT CMAKE_CUDA_COMPILER_VERSION VERSION_GREATER_EQUAL "11.4")
-      message(${FAILURE_SEVERITY} "CUDA Version too old: ${CMAKE_CUDA_COMPILER_VERSION}, 11.4 required")
+    if (NOT CMAKE_CUDA_COMPILER_VERSION VERSION_GREATER_EQUAL "12.6")
+      message(${FAILURE_SEVERITY} "CUDA Version too old: ${CMAKE_CUDA_COMPILER_VERSION}, 12.6 required")
       set(CMAKE_CUDA_COMPILER OFF)
     endif()
   endif()
@@ -115,9 +115,6 @@ if(ENABLE_CUDA)
     if(GPUCA_KERNEL_RESOURCE_USAGE_VERBOSE)
       string(APPEND CMAKE_CUDA_FLAGS " -Xptxas -v")
     endif()
-    if(CMAKE_CUDA_COMPILER_VERSION VERSION_GREATER_EQUAL "12.3")
-      string(APPEND CMAKE_CUDA_FLAGS " -Xcudafe --diag_suppress=20257") # TODO: Cleanup
-    endif()
     if (NOT ENABLE_CUDA STREQUAL "AUTO")
       string(APPEND CMAKE_CUDA_FLAGS " --allow-unsupported-compiler")
     endif()