Update Makefile

Makefile

-CXX = g++
-CXXFLAGS = -std=c++17 -Wall -Wextra -O0
+CXX = clang++
+CXXFLAGS = -std=c++17 -Wall -Wextra -O3 
 TARGET = main
-SRC = matrix_opencl.cpp main.cpp mlp_sgd.cpp globals.cpp
+SRC = matrix_opencl.cpp mlp_sgd.cpp globals.cpp
+LIBS = -lOpenCL
 
 all:
 	$(MAKE) clean && $(MAKE) run
 
 $(TARGET): $(SRC)
-	$(CXX) $(CXXFLAGS) -o $(TARGET) $(SRC) -lOpenCL
+	$(CXX) $(CXXFLAGS) -o $(TARGET)$(SUFFIX) $(SRC) main.cpp $(LIBS)
 
 run: $(TARGET)
 	./$(TARGET)
 
+fast: benchmark.cpp
+	$(CXX) $(CXXFLAGS) -DFAST_MATMUL -o benchmark$(SUFFIX) benchmark.cpp $(LIBS) $(SRC)
+
+naive: benchmark.cpp
+	$(CXX) $(CXXFLAGS) -o benchmark$(SUFFIX) benchmark.cpp $(LIBS) $(SRC)
+
 clean:
 	rm -f $(TARGET)
+	rm -f benchmark
+
 
 .PHONY: all run clean
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