Restore Quark proof-of-work mining

contrib/build-linux.sh

@@ -4,6 +4,7 @@ set -euo pipefail
 ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 JOBS="${JOBS:-1}"
 MODE="${MODE:-daemon}"
+DAEMON_TARGETS="${DAEMON_TARGETS:-agrariand agrarian-cli agrarian-tx}"
 HOST="${HOST:-$("$ROOT/depends/config.guess")}"
 PREFIX="$ROOT/depends/$HOST"
 BASE_CONFIG="$PREFIX/share/config.site"
@@ -65,5 +66,9 @@ case "$MODE" in
     ;;
 esac
 
-make -j"$JOBS"
+if [[ "$MODE" == "daemon" ]]; then
+  make -j"$JOBS" $DAEMON_TARGETS
+else
+  make -j"$JOBS"
+fi
 echo "Linux $MODE build complete."

src/primitives/block.cpp

@@ -15,10 +15,7 @@
 
 uint256 CBlockHeader::GetHash() const
 {
-    if(nVersion < 4)
     return HashQuark(BEGIN(nVersion), END(nNonce));
-
-    return Hash(BEGIN(nVersion), END(nAccumulatorCheckpoint));
 }
 
 uint256 CBlock::BuildMerkleTree(bool* fMutated) const

src/rpc/mining.cpp

@@ -605,6 +605,7 @@ UniValue getblocktemplate(const UniValue& params, bool fHelp)
     result.push_back(Pair("curtime", pblock->GetBlockTime()));
     result.push_back(Pair("bits", strprintf("%08x", pblock->nBits)));
     result.push_back(Pair("height", (int64_t)(pindexPrev->nHeight + 1)));
+    result.push_back(Pair("acc_checkpoint", pblock->nAccumulatorCheckpoint.GetHex()));
     result.push_back(Pair("votes", aVotes));