Do not print soft-fork-script warning with -promiscuousmempool

src/validation.cpp

@@ -784,8 +784,20 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
         unsigned int currentBlockScriptVerifyFlags = GetBlockScriptFlags(chainActive.Tip(), Params().GetConsensus());
         if (!CheckInputs(tx, state, view, true, currentBlockScriptVerifyFlags, true, true, txdata))
         {
-            return error("%s: BUG! PLEASE REPORT THIS! ConnectInputs failed against MANDATORY but not STANDARD flags %s, %s",
-                __func__, hash.ToString(), FormatStateMessage(state));
+            // If we're using promiscuousmempoolflags, we may hit this normally
+            // Check if current block has some flags that scriptVerifyFlags
+            // does not before printing an ominous warning
+            if (!(~scriptVerifyFlags & currentBlockScriptVerifyFlags)) {
+                return error("%s: BUG! PLEASE REPORT THIS! ConnectInputs failed against latest-block but not STANDARD flags %s, %s",
+                    __func__, hash.ToString(), FormatStateMessage(state));
+            } else {
+                if (!CheckInputs(tx, state, view, true, MANDATORY_SCRIPT_VERIFY_FLAGS, true, false, txdata)) {
+                    return error("%s: ConnectInputs failed against MANDATORY but not STANDARD flags due to promiscuous mempool %s, %s",
+                        __func__, hash.ToString(), FormatStateMessage(state));
+                } else {
+                    LogPrintf("Warning: -promiscuousmempool flags set to not include currently enforced soft forks, this may break mining or otherwise cause instability!\n");
+                }
+            }
         }
 
         // Remove conflicting transactions from the mempool