Add force mining to client.

eth/main.cpp

@@ -100,6 +100,7 @@ void help()
         << "    -c,--client-name <name>  Add a name to your client's version string (default: blank)." << endl
         << "    -d,--db-path <path>  Load database from path (default:  ~/.ethereum " << endl
         << "                         <APPDATA>/Etherum or Library/Application Support/Ethereum)." << endl
+		<< "    -f,--force-mining  Mine even when there are no transaction to mine (Default: off)" << endl
 		<< "    -h,--help  Show this help message and exit." << endl
         << "    -i,--interactive  Enter interactive mode (default: non-interactive)." << endl
 #if ETH_JSONRPC
@@ -185,6 +186,7 @@ int main(int argc, char** argv)
 #endif
 	string publicIP;
 	bool upnp = true;
+	bool forceMining = false;
 	string clientName;
 
 	// Init defaults
@@ -256,6 +258,8 @@ int main(int argc, char** argv)
 				return -1;
 			}
 		}
+		else if (arg == "-f" || arg == "--force-mining")
+			forceMining = true;
 		else if (arg == "-i" || arg == "--interactive")
 			interactive = true;
 #if ETH_JSONRPC
@@ -294,6 +298,8 @@ int main(int argc, char** argv)
     Client c("Ethereum(++)/" + clientName + "v" + eth::EthVersion + "/" ETH_QUOTED(ETH_BUILD_TYPE) "/" ETH_QUOTED(ETH_BUILD_PLATFORM), coinbase, dbPath);
 	cout << credits();
 
+	c.setForceMining(forceMining);
+
 	cout << "Address: " << endl << toHex(us.address().asArray()) << endl;
 	c.startNetwork(listenPort, remoteHost, remotePort, mode, peers, publicIP, upnp);