Split compilation lines for SYCL Stream

The Makefile for SYCL Stream compilation is now split with
individual lines for each file. This facilitates identifying
compile time errors and avoids warnings on unused symbols.

SYCL.make

@@ -1,12 +1,18 @@
 
 COMPUTECPP_FLAGS = $(shell $(COMPUTECPP_PACKAGE_ROOT_DIR)/bin/computecpp_info --dump-device-compiler-flags)
 
-sycl-stream: main.cpp SYCLStream.cpp SYCLStream.sycl
-	$(CXX) -O3 -std=c++11 -DSYCL main.cpp SYCLStream.cpp -I$(COMPUTECPP_PACKAGE_ROOT_DIR)/include -include SYCLStream.sycl $(EXTRA_FLAGS) -L$(COMPUTECPP_PACKAGE_ROOT_DIR)/lib -lComputeCpp -lOpenCL -Wl,--rpath=$(COMPUTECPP_PACKAGE_ROOT_DIR)/lib/ -o $@
+sycl-stream: main.o SYCLStream.o SYCLStream.sycl
+	$(CXX) -O3 -std=c++11 -DSYCL main.o SYCLStream.o $(EXTRA_FLAGS) -L$(COMPUTECPP_PACKAGE_ROOT_DIR)/lib -lComputeCpp -lOpenCL -Wl,--rpath=$(COMPUTECPP_PACKAGE_ROOT_DIR)/lib/ -o $@ 
+
+main.o: main.cpp
+	$(CXX) -O3 -std=c++11 -DSYCL main.cpp -c -I$(COMPUTECPP_PACKAGE_ROOT_DIR)/include  $(EXTRA_FLAGS) -o $@ 
+
+SYCLStream.o: SYCLStream.cpp SYCLStream.sycl
+	$(CXX) -O3 -std=c++11 -DSYCL SYCLStream.cpp -c -I$(COMPUTECPP_PACKAGE_ROOT_DIR)/include -include SYCLStream.sycl $(EXTRA_FLAGS) -o $@ 
 
 SYCLStream.sycl: SYCLStream.cpp
-	$(COMPUTECPP_PACKAGE_ROOT_DIR)/bin/compute++ SYCLStream.cpp $(COMPUTECPP_FLAGS) -c -I$(COMPUTECPP_PACKAGE_ROOT_DIR)/include -o $@
+	$(COMPUTECPP_PACKAGE_ROOT_DIR)/bin/compute++ -DSYCL SYCLStream.cpp $(COMPUTECPP_FLAGS) -c -I$(COMPUTECPP_PACKAGE_ROOT_DIR)/include -o $@ 
 
 .PHONY: clean
 clean:
-	rm -f sycl-stream SYCLStream.sycl SYCLStream.bc
+	rm -f sycl-stream SYCLStream.sycl main.o SYCLStream.o