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I'm having this issue where the GCC compiler seems to be failing when it comes to linking two object files I have together. Both object files foo1.cc and foo2.cc include classes from a header file called foo1.hh . In addition, the header file foo.hh has as an external declaration of an object instance that appears in foo1.cc . It should be noted that the header file foo.hh will only be defined once between the two source files foo1.cc and foo2.cc . When I compile the source files using the following command, everything seems to work: g++ foo1.cc foo2.cc The above command will produce an executable called a.out . When I try to compile the source files into object files independently: g++ -c foo1.cc g++ -c foo2.cc g++ -o foo1.o foo2.o The GCC compiler complains that there are undefined references to functions in foo2.cc . These functions should be defined in foo1.cc ; however, the linker doesn't recognize that. I was wondering if there was a way to get around this issue with the GCC compiler.

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