Merge #6328: backport: bitcoin/bitcoin#30131, #23258, #30504 - fix bild for Ubuntu 24.10 + clang

e994691e2d Merge bitcoin/bitcoin#30504: doc: use proper doxygen formatting for CTxMemPool::cs (merge-script)
a3e6378108 Merge bitcoin/bitcoin#23258: doc: Fix outdated comments referring to ::ChainActive() (fanquake)
dcbf671551 Merge bitcoin/bitcoin#30131: wallet, tests: Avoid stringop-overflow warning in PollutePubKey (merge-script)

Pull request description:

  ## Issue being fixed or feature implemented
  It fixes build with clang 19.1.1 (default clang version on Ubuntu 24.10)

  ## What was done?
  Backport 30131, 30504 to fix compilation error and warning; 23258 to reduce conflicts.
  See commit messages for details

  ## How Has This Been Tested?
  Build and succeed
  ```
  CC=clang CXX=clang++ ./configure --prefix=$(pwd)/depends/x86_64-pc-linux-gnu --enable-suppress-external-warnings   --enable-debug  --enable-stacktraces --enable-werror --enable-crash-hooks --enable-maintainer-mode --enable-multiprocess
  ```

  ## Breaking Changes
  N/A

  ## Checklist:
  - [x] I have performed a self-review of my own code
  - [x] I have commented my code, particularly in hard-to-understand areas
  - [x] I have added or updated relevant unit/integration/functional/e2e tests
  - [x] I have made corresponding changes to the documentation
  - [x] I have assigned this pull request to a milestone

ACKs for top commit:
  PastaPastaPasta:
    utACK e994691e2d
  UdjinM6:
    utACK e994691e2d

Tree-SHA512: 82623030c164c0852d87e8497a59157630f87a385050b6c58d79bf5a8f32462fb26cb02e61b1062afdf9f835e10b9baf4590c326c0fb41bbdd79c82e9d105513

src/index/base.cpp

@@ -331,7 +331,7 @@ bool BaseIndex::BlockUntilSyncedToCurrentChain() const
 
     {
         // Skip the queue-draining stuff if we know we're caught up with
-        // ::ChainActive().Tip().
+        // m_chain.Tip().
         LOCK(cs_main);
         const CBlockIndex* chain_tip = m_chainstate->m_chain.Tip();
         const CBlockIndex* best_block_index = m_best_block_index.load();

src/policy/fees.cpp

@@ -554,7 +554,7 @@ void CBlockPolicyEstimator::processTransaction(const CTxMemPoolEntry& entry, boo
     if (txHeight != nBestSeenHeight) {
         // Ignore side chains and re-orgs; assuming they are random they don't
         // affect the estimate.  We'll potentially double count transactions in 1-block reorgs.
-        // Ignore txs if BlockPolicyEstimator is not in sync with ::ChainActive().Tip().
+        // Ignore txs if BlockPolicyEstimator is not in sync with ActiveChain().Tip().
         // It will be synced next time a block is processed.
         return;
     }

src/txmempool.h

@@ -494,17 +494,14 @@ public:
      * that are guarded by it.
      *
      * @par Consistency guarantees
-     *
      * By design, it is guaranteed that:
-     *
      * 1. Locking both `cs_main` and `mempool.cs` will give a view of mempool
-     *    that is consistent with current chain tip (`::ChainActive()` and
+     *    that is consistent with current chain tip (`ActiveChain()` and
      *    `CoinsTip()`) and is fully populated. Fully populated means that if the
      *    current active chain is missing transactions that were present in a
      *    previously active chain, all the missing transactions will have been
      *    re-added to the mempool and should be present if they meet size and
      *    consistency constraints.
-     *
      * 2. Locking `mempool.cs` without `cs_main` will give a view of a mempool
      *    consistent with some chain that was active since `cs_main` was last
      *    locked, and that is fully populated as described above. It is ok for

src/validation.h

@@ -101,7 +101,7 @@ static const bool DEFAULT_SYNC_MEMPOOL = true;
 
 /** Default for -stopatheight */
 static const int DEFAULT_STOPATHEIGHT = 0;
-/** Block files containing a block-height within MIN_BLOCKS_TO_KEEP of ::ChainActive().Tip() will not be pruned. */
+/** Block files containing a block-height within MIN_BLOCKS_TO_KEEP of ActiveChain().Tip() will not be pruned. */
 static const unsigned int MIN_BLOCKS_TO_KEEP = 288;
 static const signed int DEFAULT_CHECKBLOCKS = 6;
 static const unsigned int DEFAULT_CHECKLEVEL = 3;

src/wallet/test/wallet_tests.cpp

@@ -531,8 +531,10 @@ static void TestWatchOnlyPubKey(LegacyScriptPubKeyMan* spk_man, const CPubKey& a
 // Cryptographically invalidate a PubKey whilst keeping length and first byte
 static void PollutePubKey(CPubKey& pubkey)
 {
-    std::vector<unsigned char> pubkey_raw(pubkey.begin(), pubkey.end());
-    std::fill(pubkey_raw.begin()+1, pubkey_raw.end(), 0);
+    assert(pubkey.size() >= 1);
+    std::vector<unsigned char> pubkey_raw;
+    pubkey_raw.push_back(pubkey[0]);
+    pubkey_raw.insert(pubkey_raw.end(), pubkey.size() - 1, 0);
     pubkey = CPubKey(pubkey_raw);
     assert(!pubkey.IsFullyValid());
     assert(pubkey.IsValid());

src/wallet/wallet.cpp

@@ -1366,7 +1366,7 @@ void CWallet::updatedBlockTip()
 void CWallet::BlockUntilSyncedToCurrentChain() const {
     AssertLockNotHeld(cs_wallet);
     // Skip the queue-draining stuff if we know we're caught up with
-    // chainActive.Tip(), otherwise put a callback in the validation interface queue and wait
+    // chain().Tip(), otherwise put a callback in the validation interface queue and wait
     // for the queue to drain enough to execute it (indicating we are caught up
     // at least with the time we entered this function).
     uint256 last_block_hash = WITH_LOCK(cs_wallet, return m_last_block_processed);