organize project and specify directory for object files in Makefile

This is a discussion on organize project and specify directory for object files in Makefile within the C++ Programming forums, part of the General Programming Boards category; Hi, Here are my two questions: 1. I am now learning to manage my code with CVS, and I just ...

  1. #1
    Registered User
    Join Date
    Jan 2009
    Posts
    159

    organize project and specify directory for object files in Makefile

    Hi,
    Here are my two questions:

    1. I am now learning to manage my code with CVS, and I just want to make a repository for my C++ files, Makefile and bash and python scripts only, not the object files and executables. So I made several subdirectories under my project directory: src, bin, scripts, results and data. I put C++ files and Makefile under ~/myproject/src, bash and python scripts under ~/myproject/scripts and object and executables under ~/myproject/bin. I am hoping only the files under src and scripts will be updated via CVS. I wonder how you guys organize your projects? Just hope to follow some good habits

    2. Since I put my C++ files and Makefile into ~/myproject/src and object and executable files into ~/myproject/bin, I have to specify the directories in Makefile. Here is what I am doing
    Code:
    ...
    BIN_DIR=/home/myproject/bin/
    
    all: $(BIN_DIR)myexecutable TAGS
    
    TAGS: *.cc *.h
    	etags --members --declarations -l c++ *.cc *.h
    
    $(BIN_DIR)myexecutable: $(BIN_DIR)myobject.o
    	$(CXX) $(CXXFLAGS) -o $@ $^ $(LDFLAGS)
    
    Makefile.depend: *.h *.cc Makefile
    	$(CXX) -M $(CXXFLAGS) *.cc > Makefile.depend
    
    clean:
    	\rm -f $(BIN_DIR)myexecutable $(BIN_DIR)*.o Makefile.depend TAGS
    However this will give error
    make: *** No rule to make target `/home/myproject/bin/myobject.o', needed by `/home/myproject/bin/myexecutable'.
    How to specify a different directory for object and executable files from C++ files in Makefile?

    Thanks and regards!

  2. #2
    Ex scientia vera
    Join Date
    Sep 2007
    Posts
    478
    What's the problem? "myobject.o" is a dependency, but you do not have a make rule for it. It isn't being compiled. Add a rule and it's fixed.
    "What's up, Doc?"
    "'Up' is a relative concept. It has no intrinsic value."

  3. #3
    Registered User
    Join Date
    Jan 2009
    Posts
    159
    I think
    Code:
    $(CXX) $(CXXFLAGS) -o $@ $^ $(LDFLAGS)
    is to generate the object files from C++ files. But how to specify that I want the object files to be generated under /home/myproject/bin?

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