kou commented on code in PR #36584:
URL: https://github.com/apache/arrow/pull/36584#discussion_r1257681400


##########
cpp/cmake_modules/FindgRPCAlt.cmake:
##########
@@ -36,7 +36,7 @@ if(GRPCPP_PC_FOUND)
   # gRPC's pkg-config file neglects to specify pthreads.
   find_package(Threads REQUIRED)
   if(ARROW_GRPC_USE_SHARED)
-    set(GRPCPP_LINK_LIBRARIES ${GRPCPP_PC_LINK_LIBRARIES} Threads::Threads)
+    list(APPEND GRPCPP_LINK_LIBRARIES ${GRPCPP_PC_LINK_LIBRARIES})

Review Comment:
   Could you use `set()` instead of `list(APPEND)` because we don't use any 
pre-defined `GRPCPP_LINK_LIBRARIES` here?
   
   ```suggestion
       set(GRPCPP_LINK_LIBRARIES ${GRPCPP_PC_LINK_LIBRARIES})
   ```



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