fix warnings: unused variable 'XX' [-Wunused-variable]

src/net.cpp

@@ -1233,8 +1233,6 @@ void ThreadOpenConnections2(void* parg)
         if (fShutdown)
             return;
 
-        bool fAddSeeds = false;
-
         // Add seed nodes if IRC isn't working
         bool fTOR = (fUseProxy && addrProxy.GetPort() == 9050);
         if (addrman.size()==0 && (GetTime() - nStart > 60 || fTOR) && !fTestNet)
@@ -1260,7 +1258,6 @@ void ThreadOpenConnections2(void* parg)
         // Choose an address to connect to based on most recently seen
         //
         CAddress addrConnect;
-        int64 nBest = std::numeric_limits<int64>::min();
 
         // Only connect to one address per a.b.?.? range.
         // Do this here so we don't have to critsect vNodes inside mapAddresses critsect.

src/qt/bitcoinstrings.cpp

@@ -1,6 +1,11 @@
 #include <QtGlobal>
 // Automatically generated by extract_strings.py
-static const char *bitcoin_strings[] = {QT_TRANSLATE_NOOP("bitcoin-core", ""
+#ifdef __GNUC__
+#define UNUSED __attribute__((unused))
+#else
+#define UNUSED
+#endif
+static const char UNUSED *bitcoin_strings[] = {QT_TRANSLATE_NOOP("bitcoin-core", ""
 "Unable to bind to port %d on this computer.  Bitcoin is probably already "
 "running."),
 QT_TRANSLATE_NOOP("bitcoin-core", "Warning: Disk space is low  "),

src/script.cpp

@@ -1443,7 +1443,6 @@ bool ExtractAddresses(const CScript& scriptPubKey, txnouttype& typeRet, vector<C
     if (typeRet == TX_MULTISIG)
     {
         nRequiredRet = vSolutions.front()[0];
-        int n = vSolutions.back()[0];
         for (int i = 1; i < vSolutions.size()-1; i++)
         {
             CBitcoinAddress address;