make follow source dependencies

alib2/makefile

-CC=g++
-LIBRARY=libalib2.so 
-TESTBIN=alib2test
-CCFLAGS= -std=c++11 -O2 -g -c -Wall -pedantic -Wextra -fPIC -I/usr/include/libxml2/ 
-LDFLAGS= -shared -lxml2
-TEST_CCFLAGS= -std=c++11 -O2 -g -c -Wall -pedantic -Wextra -I../alib2/src -I/usr/include/libxml2/ 
-TEST_LDFLAGS= -L../alib2/lib -lxml2 -lalib2 -lcppunit -Wl,-rpath,.
-SOURCES=$(shell find src/ -name *cpp)
-OBJECTS=$(patsubst src/%.cpp, obj/%.o, $(SOURCES))
-TEST_SOURCES=$(shell find test-src/ -name *cpp)
-TEST_OBJECTS=$(patsubst test-src/%.cpp, test-obj/%.o, $(TEST_SOURCES))
-.PHONY: all
-.PHONY: test
+SHELL:=/bin/bash
+LIBRARY:=libalib2.so 
+TESTBIN:=alib2test
+CXXFLAGS:= -std=c++11 -O2 -g -c -Wall -pedantic -Wextra -fPIC -I/usr/include/libxml2/ 
+LDFLAGS:= -shared -lxml2
+TEST_CXXFLAGS:= -std=c++11 -O2 -g -c -Wall -pedantic -Wextra -I../alib2/src -I/usr/include/libxml2/ 
+TEST_LDFLAGS:= -L../alib2/lib -lxml2 -lalib2 -lcppunit -Wl,-rpath,.
+SOURCES:=$(shell find src/ -name *cpp)
+OBJECTS:=$(patsubst src/%.cpp, obj/%.o, $(SOURCES))
+DEPENDENCIES:=$(patsubst src/%.cpp, obj/%.d, $(SOURCES))
+TEST_SOURCES:=$(shell find test-src/ -name *cpp)
+TEST_OBJECTS:=$(patsubst test-src/%.cpp, test-obj/%.o, $(TEST_SOURCES))
+TEST_DEPENDENCIES:=$(patsubst test-src/%.cpp, test-obj/%.d, $(TEST_SOURCES))
+.PHONY: all build test clean
+.PRECIOUS: $(DEPENDENCIES) $(TEST_DEPENDENCIES)
 all: build test
 lib/$(LIBRARY): $(OBJECTS)
-	mkdir -p lib
-	$(CC) $(OBJECTS) -o $@ $(LDFLAGS)
-obj/%.o: src/%.cpp
+	mkdir -p lib;
+	$(CXX) $(OBJECTS) -o $@ $(LDFLAGS);
+obj/%.d:
 	mkdir -p $(dir $@)
-	$(CC) $(CCFLAGS) $< -o $@
+	echo "$(shell sha1sum <<< "$@" | sed "s/  -//g") = \$$(shell \$$(CXX) -MM \$$(CXXFLAGS) $(patsubst obj/%.d,src/%.cpp, $@) | sed \"s/.*://g\" | sed \"s/\\\\\\\\//g\")" >> $@
+	echo "$(patsubst %.d,%.o, $@): \$$($(shell sha1sum <<< "$@" | sed "s/  -//g"))" >> $@
+	echo "	\$$(CXX) \$$(CXXFLAGS) \$$< -o $(patsubst %.d,%.o, $@)" >> $@
 build: lib/$(LIBRARY)
 test-bin/$(TESTBIN): $(TEST_OBJECTS) lib/$(LIBRARY)
-	mkdir -p test-bin
-	$(CC) $(TEST_OBJECTS) -o $@ $(TEST_LDFLAGS)
-test-obj/%.o: test-src/%.cpp
+	mkdir -p test-bin; \
+	$(CXX) $(TEST_OBJECTS) -o $@ $(TEST_LDFLAGS); \
+test-obj/%.d:
 	mkdir -p $(dir $@)
-	$(CC) $(TEST_CCFLAGS) $< -o $@
+	echo "$(shell sha1sum <<< "$@" | sed "s/  -//g") = \$$(shell \$$(CXX) -MM \$$(TEST_CXXFLAGS) $(patsubst test-obj/%.d,test-src/%.cpp, $@) | sed \"s/.*://g\" | sed \"s/\\\\\\\\//g\")" >> $@
+	echo "$(patsubst %.d,%.o, $@): \$$($(shell sha1sum <<< "$@" | sed "s/  -//g"))" >> $@
+	echo "	\$$(CXX) \$$(TEST_CXXFLAGS) \$$< -o $(patsubst %.d,%.o, $@)" >> $@
 test: test-bin/$(TESTBIN)
 	LD_LIBRARY_PATH=lib test-bin/$(TESTBIN)
 clean:
 	$(RM) -r *.o *.d lib obj test-bin test-obj
+
+-include $(DEPENDENCIES)
+-include $(TEST_DEPENDENCIES)
+