fix mac compile on clang++13

CMakeLists.txt

@@ -23,6 +23,9 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
         -Wno-return-std-move -Wno-unused-private-field -Wno-unused-lambda-capture -Wno-sign-compare \
         -Wno-overloaded-virtual -Wno-unneeded-internal-declaration -Wno-unused-variable -Wno-pessimizing-move \
         -Wno-inconsistent-missing-override -DHALF_ENABLE_CPP11_USER_LITERALS=0 -D_FORTIFY_SOURCE=2")
+    if("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 13.1)
+        set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -Wno-unused-but-set-variable")
+    endif()
 elseif(ENABLE_SYM_FILE)
     set(CMAKE_CXX_FLAGS_RELEASE "$ENV{CXXFLAGS} -O2 -g -ggdb -Wl,--allow-shlib-undefined \
         -DHALF_ENABLE_CPP11_USER_LITERALS=0 -D_FORTIFY_SOURCE=2")

mindspore/ccsrc/minddata/dataset/engine/cache/cache_service.cc

@@ -102,7 +102,6 @@ Status CacheService::CacheRow(const std::vector<const void *> &buf, row_id_type
       *row_id_generated = msg->row_id();
     }
     auto size_of_this = msg->size_of_this();
-    size_t total_sz = size_of_this;
     auto column_hdr = msg->column();
     // Number of tensor buffer should match the number of columns plus one.
     if (buf.size() != column_hdr->size() + 1) {
@@ -116,7 +115,6 @@ Status CacheService::CacheRow(const std::vector<const void *> &buf, row_id_type
     all_data.emplace_back(fb, size_of_this);
     for (auto i = 0; i < column_hdr->size(); ++i) {
       all_data.emplace_back(buf.at(i + 1), msg->data_sz()->Get(i));
-      total_sz += msg->data_sz()->Get(i);
     }
     // Now we cache the buffer.
     Status rc = cp_->Insert(*row_id_generated, all_data);