make file: header including another header C++

Question

I have 3 files

main.cpp
a.h
b.h

main.cpp includes both a.h and b.h b.h includes a.h

could anyone explain me how should I write a make file for this?

Is this correct?

objects = main.o 
sources = main.cpp

myProj: $(objects) 
    g++ -o myProj $(objects)

main.o: a.h b.h 


$(objects): $(sources)
    g++ -c $(sources)

clean:
    rm $(objects) myProj

I dont know how to specify the dependency of b.h on a.h

Sergey Kalinichenko · Accepted Answer · 2012-07-02 01:45:20Z

2

Since headers are always compiled as part of .c/.cpp file, there is no need to specify header-to-header dependency. The dependency that you have specified already is sufficient, because main.cpp will recompile when a.h and/or b.h change.

answered Jul 2, 2012 at 1:45

Sergey Kalinichenko

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3 Comments

user1344389 Over a year ago

so my make file is correcct??

Sergey Kalinichenko Over a year ago

@user1344389 Yes, I think it's correct. You can check that the dependencies are OK by modifying one or both headers, and checking if it triggers a recompile; it should.

Reinier Torenbeek Over a year ago

@user1344389 It might be educational to read about Automatic Variables to improve your makefile. For example, in stead of g++ -o myProj $(objects) it would be better to use g++ -o $@ $^

harmonickey · Accepted Answer · 2012-07-02 05:52:53Z

1

If you are at all any more confused on makefile concepts, I would recommend checking out this helpful tutorial.

http://www.cs.umd.edu/class/fall2002/cmsc214/Tutorial/makefile.html

answered Jul 2, 2012 at 5:52

harmonickey

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