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This is correct, it compiled main.cpp file into an object file, main.o, then linked it into an executable file, 'hello'.

It didn't print "hello world" because you didn't actually run ./hello

So don't give it -cpp.

gcc will happily compile c++ objects but can't tell the difference between C .o files and c++ .o files. So when you try and link a c++ program with gcc, it won't link in the C++ libraries and things...