[REVIEW] Serializer for mdspans

cpp/CMakeLists.txt

@@ -1,5 +1,5 @@
 # =============================================================================
-# Copyright (c) 2020-2022, NVIDIA CORPORATION.
+# Copyright (c) 2020-2023, NVIDIA CORPORATION.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 # in compliance with the License. You may obtain a copy of the License at
@@ -218,6 +218,15 @@ target_link_libraries(
 
 target_compile_features(raft INTERFACE cxx_std_17 $<BUILD_INTERFACE:cuda_std_17>)
 
+# Endian detection
+include(TestBigEndian)
+test_big_endian(BIG_ENDIAN)
+if(BIG_ENDIAN)
+  target_compile_definitions(raft INTERFACE RAFT_SYSTEM_LITTLE_ENDIAN=0)
+else()
+  target_compile_definitions(raft INTERFACE RAFT_SYSTEM_LITTLE_ENDIAN=1)
+endif()
+
 if(RAFT_COMPILE_DIST_LIBRARY OR RAFT_COMPILE_NN_LIBRARY)
   file(
     WRITE "${CMAKE_CURRENT_BINARY_DIR}/fatbin.ld"