3 files changed, 2 insertions, 5 deletions
diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 8ec624254..cdad39a2c 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -973,7 +973,7 @@ start:
 std::pair<bool, uint64_t> Blockchain::check_difficulty_checkpoints() const
 {
   uint64_t res = 0;
-  for (const std::pair<uint64_t, difficulty_type>& i : m_checkpoints.get_difficulty_points())
+  for (const std::pair<const uint64_t, difficulty_type>& i : m_checkpoints.get_difficulty_points())
   {
     if (i.first >= m_db->height())
       break;
@@ -3438,7 +3438,6 @@ bool Blockchain::check_tx_inputs(transaction& tx, tx_verification_context &tvc,
       bool failed = false;
       for (size_t i = 0; i < tx.vin.size(); i++)
       {
-        const txin_to_key& in_to_key = boost::get<txin_to_key>(tx.vin[i]);
         if(!failed && !results[i])
           failed = true;
       }
diff --git a/src/cryptonote_core/cryptonote_core.cpp b/src/cryptonote_core/cryptonote_core.cpp
index 12125fb9d..57104fd59 100644
--- a/src/cryptonote_core/cryptonote_core.cpp
+++ b/src/cryptonote_core/cryptonote_core.cpp
@@ -630,7 +630,7 @@ namespace cryptonote
 
           void operator()(std::uint64_t, epee::span<const block> blocks) const
           {
-            for (const block bl : blocks)
+            for (const block& bl : blocks)
               cmdline.notify("%s", epee::string_tools::pod_to_hex(get_block_hash(bl)).c_str(), NULL);
           }
         };
diff --git a/src/cryptonote_core/tx_pool.cpp b/src/cryptonote_core/tx_pool.cpp
index d059ab78f..a7e96e23a 100644
--- a/src/cryptonote_core/tx_pool.cpp
+++ b/src/cryptonote_core/tx_pool.cpp
@@ -383,7 +383,6 @@ namespace cryptonote
   bool tx_memory_pool::add_tx(transaction &tx, tx_verification_context& tvc, relay_method tx_relay, bool relayed, uint8_t version)
   {
     crypto::hash h = null_hash;
-    size_t blob_size = 0;
     cryptonote::blobdata bl;
     t_serializable_object_to_blob(tx, bl);
     if (bl.size() == 0 || !get_transaction_hash(tx, h))
@@ -1041,7 +1040,6 @@ namespace cryptonote
       return true;
     }, true, category);
 
-    txpool_tx_meta_t meta;
     for (const key_images_container::value_type& kee : m_spent_key_images) {
       const crypto::key_image& k_image = kee.first;
       const std::unordered_set<crypto::hash>& kei_image_set = kee.second;