guarding blackwell build against cuda < 12.8

Author: kushanam

CMakeLists.txt

@@ -22,7 +22,10 @@ set(ignoreMe "${VLLM_PYTHON_PATH}")
 set(PYTHON_SUPPORTED_VERSIONS "3.8" "3.9" "3.10" "3.11" "3.12")
 
 # Supported NVIDIA architectures.
-set(CUDA_SUPPORTED_ARCHS "8.0;8.6;8.9;9.0;10.0;10.1;12.0")
+set(CUDA_SUPPORTED_ARCHS "8.0;8.6;8.9;9.0")
+if(${CMAKE_CUDA_COMPILER_VERSION} VERSION_GREATER_EQUAL 12.8)
+    list(APPEND CUDA_SUPPORTED_ARCHS "10.0" "10.1" "12.0")
+endif()
 
 # Supported AMD GPU architectures.
 set(HIP_SUPPORTED_ARCHS "gfx906;gfx908;gfx90a;gfx940;gfx941;gfx942;gfx1030;gfx1100")