Abort when nvcc command is not found in the PATH (#3527)

CMakeLists.txt

@@ -49,6 +49,12 @@ endif()
 #
 append_cmake_prefix_path("torch" "torch.utils.cmake_prefix_path")
 
+# Ensure the 'nvcc' command is in the PATH
+find_program(NVCC_EXECUTABLE nvcc)
+if (NOT NVCC_EXECUTABLE)
+    message(FATAL_ERROR "nvcc not found")
+endif()
+
 #
 # Import torch cmake configuration.
 # Torch also imports CUDA (and partially HIP) languages with some customizations,