GCC linker can't find standard library?

Question

I\'ve been developing a school project in XCode. The final product has to be submitted in source code with a makefile, so I wrote a makefile and to start compiling that way,

Answer 1

    gcc main.o StackList.o world.o Farm.o -g -o Project1

What in this command line do you think tells gcc to link in the C++ standard library? There are no C++ files being linked. You haven't specified a language. And you invoke the compilter as gcc.