add new combine tool as promised

tools/Makefile

@@ -0,0 +1,26 @@
+export CC  = gcc
+export CXX = g++
+export CFLAGS = -Wall -O3 -msse2  -Wno-unknown-pragmas -fopenmp
+
+# specify tensor path
+BIN = xgcombine_buffer
+OBJ = 
+.PHONY: clean all
+
+all: $(BIN) $(OBJ)
+export LDFLAGS= -pthread -lm 
+
+xgcombine_buffer : xgcombine_buffer.cpp
+
+
+$(BIN) : 
+	$(CXX) $(CFLAGS) $(LDFLAGS) -o $@ $(filter %.cpp %.o %.c, $^)
+
+$(OBJ) : 
+	$(CXX) -c $(CFLAGS) -o $@ $(firstword $(filter %.cpp %.c, $^) )
+
+install:
+	cp -f -r $(BIN)  $(INSTALL_PATH)
+
+clean:
+	$(RM) $(OBJ) $(BIN) *~