Fix mac build

util/options_test.cc

@@ -470,12 +470,12 @@ TEST(OptionsTest, GetOptionsFromStringTest) {
       &new_options));
 
   ASSERT_EQ(new_options.write_buffer_size, 10U);
-  ASSERT_EQ(new_options.max_write_buffer_number, 16U);
+  ASSERT_EQ(new_options.max_write_buffer_number, 16);
   BlockBasedTableOptions new_block_based_table_options =
       dynamic_cast<BlockBasedTableFactory*>(new_options.table_factory.get())
           ->GetTableOptions();
   ASSERT_EQ(new_block_based_table_options.block_cache->GetCapacity(), 1U << 20);
-  ASSERT_EQ(new_block_based_table_options.block_size, 4);
+  ASSERT_EQ(new_block_based_table_options.block_size, 4U);
   // don't overwrite block based table options
   ASSERT_TRUE(new_block_based_table_options.cache_index_and_filter_blocks);