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c++c++11makefile
Reblochon Masqué
Reblochon Masqué

Reputation: 55

Makefile with two C++ files : How can I choose the file to compile?

Let's say I have two C++ main files, project.cpp, and projectgraph.cpp. They both use the same header file functions.h, as well as the file functions.cpp.

To compile project.cpp, I'm using the following makefile :

CXX = g++
CXXFLAGS= -std=c++11 -w -Wall -g 

project: project.o functions.o 
    $(CXX) $(CXXFLAGS) -o project projet.o functions.o 

functions.o: functions.h

clean:
    rm -rf *.o

I would like to be able to choose between project.cpp and projectgraph.cpp to be compiled using the make command in the terminal. For example :

How can I change the makefile to get this result ?

Thanks !

Upvotes: 2

Views: 364

Answers (2)

Barmar
Barmar

Reputation: 781190

Just add a target for the additional program. Also, functions.cpp needs to be in the dependency list for functions.o, and functions.h should be in the dependency list of project and projectgraph.

CXX = g++
CXXFLAGS= -std=c++11 -w -Wall -g 

project: project.o functions.o functions.h
    $(CXX) $(CXXFLAGS) -o project projet.o functions.o 

functions.o: functions.cpp functions.h

projectgraph: projectgraph.o functions.o functions.h
    $(CXX) $(CXXFLAGS) -o project projet.o functions.o 

clean:
    rm -rf *.o

Then you can use

make projectgraph

Upvotes: 3

David
David

Reputation: 437

I believe all you need to do is : 

graph : project.o functions.o 
    $(CXX) $(CXXFLAGS) -o projectgraph projectgraph.o functions.o

At least, that is what I have done int he past. There is a whole lot more you can do to make project the default etc but the above should be what you asked for.

Upvotes: 0

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