fix gcc-8 / g++-8 build

src/chain.h

@@ -335,7 +335,7 @@ public:
         nSolution      = block.nSolution;
     }
 
-    int32_t SetHeight(int32_t height)
+    void SetHeight(int32_t height)
     {
         this->chainPower.nHeight = height;
     }

src/consensus/params.h

@@ -115,8 +115,8 @@ struct Params {
     int64_t AveragingWindowTimespan() const { return nPowAveragingWindow * nPowTargetSpacing; }
     int64_t MinActualTimespan() const { return (AveragingWindowTimespan() * (100 - nPowMaxAdjustUp  )) / 100; }
     int64_t MaxActualTimespan() const { return (AveragingWindowTimespan() * (100 + nPowMaxAdjustDown)) / 100; }
-    int32_t SetSaplingHeight(int32_t height) { vUpgrades[Consensus::UPGRADE_SAPLING].nActivationHeight = height; }
-    int32_t SetOverwinterHeight(int32_t height) { vUpgrades[Consensus::UPGRADE_OVERWINTER].nActivationHeight = height; }
+    void SetSaplingHeight(int32_t height) { vUpgrades[Consensus::UPGRADE_SAPLING].nActivationHeight = height; }
+    void SetOverwinterHeight(int32_t height) { vUpgrades[Consensus::UPGRADE_OVERWINTER].nActivationHeight = height; }
     uint256 nMinimumChainWork;
 };
 } // namespace Consensus

src/crypto/verus_hash.h

@@ -86,6 +86,7 @@ class CVerusHashV2
             result = buf2;
             curPos = 0;
             std::fill(buf1, buf1 + sizeof(buf1), 0);
+            return *this; 
         }
 
         int64_t *ExtraI64Ptr() { return (int64_t *)(curBuf + 32); }