Set OpenCL sealer when -G is selected

libethereum/Client.cpp

@@ -461,6 +461,14 @@ void Client::setShouldPrecomputeDAG(bool _precompute)
 	sealEngine()->setOption("precomputeDAG", _precompute ? trueBytes: falseBytes);
 }
 
+void Client::setTurboMining(bool _enable)
+{
+	m_turboMining = _enable;
+	sealEngine()->setSealer("opencl");
+	if (isMining())
+		startMining();
+}
+
 bool Client::isMining() const
 {
 	return Ethash::isWorking(m_sealEngine.get());

libethereum/Client.h

@@ -135,7 +135,7 @@ public:
 	/// Are we allowed to GPU mine?
 	bool turboMining() const { return m_turboMining; }
 	/// Enable/disable GPU mining.
-	void setTurboMining(bool _enable = true) { m_turboMining = _enable; if (isMining()) startMining(); }
+	void setTurboMining(bool _enable = true);
 	/// Enable/disable precomputing of the DAG for next epoch
 	void setShouldPrecomputeDAG(bool _precompute);