remake the wrapper

Makefile

@@ -5,17 +5,23 @@ export CFLAGS = -Wall -O3 -msse2  -Wno-unknown-pragmas
 # specify tensor path
 BIN = xgboost
 OBJ = io.o
+SLIB = python/libxgboostwrapper.so
 .PHONY: clean all
 
-all: $(BIN) $(OBJ)
+all: $(BIN) $(OBJ) $(SLIB)
 export LDFLAGS= -pthread -lm 
 
 xgboost: src/xgboost_main.cpp io.o src/data.h src/tree/*.h src/tree/*.hpp src/gbm/*.h src/gbm/*.hpp src/utils/*.h src/learner/*.h src/learner/*.hpp 
 io.o: src/io/io.cpp src/data.h src/utils/*.h
+# now the wrapper takes in two files. io and wrapper part
+python/libxgboostwrapper.so: python/xgboost_wrapper.cpp src/io/io.cpp src/*.h src/*/*.hpp src/*/*.h
 
 $(BIN) : 
 	$(CXX) $(CFLAGS) $(LDFLAGS) -o $@ $(filter %.cpp %.o %.c, $^)
 
+$(SLIB) :
+	$(CXX) $(CFLAGS) -fPIC $(LDFLAGS) -shared -o $@ $(filter %.cpp %.o %.c, $^)
+
 $(OBJ) : 
 	$(CXX) -c $(CFLAGS) -o $@ $(firstword $(filter %.cpp %.c, $^) )