Already defined in obj file

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So what's going on here? I have read this answer , but it was no help, since it expects double inclusions. Take this fact into osideration before voting for duplicate, because this simply means beheading me without mercy. This is not a compiler error: the error is coming from the linker.

After compilation, the linker will merge the object files resulting from the compilation of each of your translation units.

The linker finds out that you have the same symbol defined multiple times in different translation units, and complains about it it is a violation of the One Definition Rule. The reason is most certainly that main. Therefore, all the symbols defined in the client. This is one of the reasons why you do not usually include. Put the definition of your class in a separate client. Finally, leave in client. By including it in other files, it will be compiled again and again!

Therefore it's contents will be included, not ifdef'd out. This is a highly unusual thing to want to do. Are both main. If so, then it's not at all surprising you get linker errors - the code in hello. This will change that line from a definition to a declaration. In exactly one. When you compile that.

Active Oldest Votes. Thanks, that worked for me when i excluded inckuded file from build. Good Luck, Bro! Nickolas Nickolas 8 8 silver badges 25 25 bronze badges. Lucas Zamboulis 2, 5 5 gold badges 23 23 silver badges 26 26 bronze badges. Otto Abildgaard Otto Abildgaard 1. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

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