How to create a make file

Recently I had to deal with mixed c++ and fortran project, and decided to use eclipse for development, created managed make C/C++ project, and wrote Makefile. I used eclipse in order to speed up. I like the navigation and auto completion features, pretty lazy to type everything. I am aware of the perl script mkmf which is very good and I also used it, but for the simple project like this one I decided that it is easier to do it by hand.

How this works.
It is very simple you just have to specify input and output files and actions which should be performed to obtain the output. Schematically it looks like this:

resultfile(s): inputfile(s)
              action

Note that the tabs are important.
Also you can specify ierarchical dependance, I like this feature very much:

 ...
result2 : result1
        action2

result : result1
       action1

all : result

Here is the example Makefile that I've created for that project.

##############Makefile

#set variables, compilers, libs, and others if you'll need them
CXX = pgCC 
FC = pgf90

CXXFLAGS =      -O2 -g -c
FCFLAGS = -i8 -r8 -byteswapio -c

OBJS =          meshrouteX11.o readccc.o
CFILES = meshrouteX11.cpp
FORTRANFILES = readccc.f90

LIBS = -lg2c  -pgf90libs  $(CLIMLIB)/lib/losub.a -lm

TARGET =        meshroute.exe

#create object files
$(OBJS): $(CFILES) $(FORTRANFILES)
                        $(CXX) $(CXXFLAGS) $(CFILES)
                        $(FC) $(FCFLAGS) $(FORTRANFILES)

#resultfile: inputfile
#                       action
$(TARGET): $(OBJS)
                        $(CXX) -o $(TARGET) $(OBJS) $(LIBS)

all:    $(TARGET)

clean:
        rm -f $(OBJS) $(TARGET)

Another simple example of the Makefile
##############Makefile

FC = gfortran

*.o : *.f90
 $(FC) -c *.f90

all :  *.o
 $(FC) *.o -o demo.exe 
 
clean:
 rm -rf *.exe
 rm -rf *.o