In function `main':: undefined reference to ...

[Sriharsha]

Graf LĂĄszlĂł wrote:

> Another question.
> I did inherit a class Page from class Base:
>
> and I modified the Makefile:
>
> ------------- Makefile ------------------
> compile :
>     g++ -c base.cpp -o base.o
>     g++ -c page.cpp base.o -o page.o      <-------- this line is new
>     g++ axf.cpp base.o page.o -o axf.o    <-------- added the page.o
>
> clear :
>     clear
>     
> clean :
>     rm *.o
>
> run :
>     ./axf.o
>
> The result is:
>     rm *.o
>     g++ -c base.cpp -o base.o
>     g++ -c page.cpp base.o -o page.o
>     g++: cannot specify -o with -c or -S and multiple compilations
>     make: *** [compile] Error 1
> Why?

It says exactly why. You _CANNOT_ specify -o when you are using -c.
Change that to
g++ -c page.cpp base.o


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