makefile

# Define common variables
CLASS_PATH = ../bin
JAVA_SRC_PATH = ../src
JAVA_HOME=/usr/lib/jvm/jdk-8-oracle-arm-vfp-hflt

#Paths to libmcp23s17 and libpifacecad
LIB_MCP23S17=../../libmcp23s17
LIB_PIFACECAD=../../libpifacecad


# Define a virtual path for .class in the bin directory
vpath %.class $(CLASS_PATH)

all : libhello.so

run :
	java -cp $(CLASS_PATH) -Djava.library.path=../jni java_exercises8_1_1.HelloJNI

java_exercises8_1_1/HelloJNI.class: $(JAVA_SRC_PATH)/java_exercises8_1_1/HelloJNI.java
	javac -cp $(CLASS_PATH) -d $(CLASS_PATH) $(JAVA_SRC_PATH)/java_exercises8_1_1/HelloJNI.java

# Targets for java_exercises8_1_1
# $@ matches the target, $< matches the first dependancy
libhello.so : HelloJNI.o
	gcc -shared -o $@ $< -L$(LIB_PIFACECAD) -lpifacecad -L$(LIB_MCP23S17) -lmcp23s17

# $@ matches the target, $< matches the first dependancy
HelloJNI.o : HelloJNI.c HelloJNI.h
	gcc -Wall -fPIC -I"$(JAVA_HOME)/include" -I"$(JAVA_HOME)/include/linux" -I$(LIB_PIFACECAD)/src -I$(LIB_MCP23S17)/src -c $< -o $@ -L$(LIB_PIFACECAD) -lpifacecad -L$(LIB_MCP23S17) -lmcp23s17

# $* matches the target filename without the extension
HelloJNI.h : java_exercises8_1_1/HelloJNI.class
	javah -o HelloJNI.h -classpath $(CLASS_PATH) java_exercises8_1_1.$*

clean :
	rm -rf HelloJNI.h HelloJNI.o libhello.so $(CLASS_PATH)/*