make is a very useful tool

I try to use Makefile in my small C or Fortran projects (for java projects I like to use maven with its pom.xml). And the more I get to know it the more I like it. This post shows an example of a Makefile created for a small project that I am trying to maintain and improve. The example demonstrates how to use if, how to compile sources from different directories and gather obtained object files to a common directory, how to avoid caveats using the wildcard function, how to get file name using notdir function. Of course all of this can be found using Google search, StackOverflow and GNU manual, those are my actual sources while creating this make file. Enjoy, and, please, comment if you see ways of improvement.

	SUITE = gcc
	#librmn = $(ARMNLIB)/lib/Linux/librmn.a
	#@echo "using suite $(SUITE) for build"
	ifeq ($(SUITE), pgi)
	boost_root = /rech/huziy/Programs/boost
	#@echo "using suite $(SUITE) for build"
	NETCDF = $(HOME)/rech_progs_40Gb/Programs/netcdf
	CXX_FLAGS = -O0 -g -c -I$(NETCDF)/include -I/software/libraries/boost-1.47/include
	endif
	ifeq ($(SUITE),gcc)
	#module load NETCDF/4.1.3-gcc
	NETCDF = /sb/software/CentOS-5/libraries/netcdf/4.1.3-gcc
	endif
	ifeq ($(SUITE), pgi)
	CXX = pgCC
	FC = pgf90
	FORTRAN_FLAGS = -i8 -r8 -byteswapio -c -Mpreprocess -g -Mbounds
	#for boost
	boost_include = -I$(boost_root)/include -L$(boost_root)/lib
	LIBS = $(CLIMLIB)/lib/losub.a -lm $(NETCDF)/lib/libnetcdf_c++.a $(NETCDF)/lib/libnetcdf.a -lcurl -lhdf5_hl -lhdf5 -pgf90libs -lboost_date_time
	endif
	ifeq ($(SUITE), gcc)
	CXX = /software/CentOS-5/compilers/gcc-4.7.2/bin/g++
	FC = /software/CentOS-5/compilers/gcc-4.7.2/bin/gfortran
	FORTRAN_FLAGS = -i8 -c -g -fbounds-check
	LIBS = -L/software/tools/hdf5/1.8.7-gcc/lib \
	-L/software/libraries/boost-1.47/lib \
	-L/software/CentOS-5/compilers/gcc-4.7.2/lib64 \
	-L/software/CentOS-5/compilers/gcc-4.7.2/lib \
	-L$(NETCDF)/lib -lnetcdf_c++ -lcurl -lhdf5_hl -lhdf5
	LINK_FLAGS = -g -v -fsignaling-nans
	CXX_FLAGS = -O0 -g -c -I$(NETCDF)/include -I/software/libraries/boost-1.47/include -fsignaling-nans
	endif
	CPP_FILES := $(wildcard *.cpp) \
	$(wildcard boost/date_time/gregorian/*.cpp boost/date_time/posix_time/*.cpp) #boost/filesystem/*/*.cpp
	OBJ_DIR = obj
	OBJS = $(patsubst %.cpp, $(OBJ_DIR)/%.o, $(notdir $(CPP_FILES)))
	FORTRANFILES = $(wildcard *.f90)
	TARGET = meshroute.exe
	test :
	@echo $(CPP_FILES)
	@echo "=================================================================="
	@echo $(OBJS)
	#compile .cpp and .f90 files
	#$(OBJS):
	#@echo Boost libs $(LIBS_BOOST)
	# @echo NETCDF=$(NETCDF)
	# $(CXX) $(CXX_FLAGS) $(CPP_FILES)
	#$(FC) $(FORTRAN_FLAGS) $(FORTRANFILES)
	#resultfile: inputfile
	# action
	$(TARGET): $(OBJS)
	@echo $(OBJS)
	$(CXX) -o $@ $^ $(LIBS) $(LINK_FLAGS)
	obj/%.o: %.cpp
	mkdir -p $(OBJ_DIR)
	$(CXX) $(CXX_FLAGS) $< -o $@
	obj/%.o: boost/date_time/gregorian/%.cpp
	mkdir -p $(OBJ_DIR)
	$(CXX) $(CXX_FLAGS) $< -o $@
	obj/%.o: boost/date_time/posix_time/%.cpp
	mkdir -p $(OBJ_DIR)
	$(CXX) $(CXX_FLAGS) $< -o $@
	all: $(TARGET)
	rm -f *.o
	clean:
	rm -f $(OBJS) $(TARGET)

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