Computer Science Canada error LNK2005: _Function already defined in student.obj |
| Author: | Srlancelot39 [ Thu Jul 10, 2014 11:46 am ] | ||
| Post subject: | error LNK2005: _Function already defined in student.obj | ||
I have a C project with 3 files: a .c file with main(), a header file, and another .c file containing functions. main() calls functions in the .c file containing the functions. This .c file #includes the header file which contains a structure used by the functions as well as by main(). My header file is surrounded with
however, I get the error: error LNK2005: _Function already defined in student.obj as well as: error LNK1169: one or more multiply defined symbols found (I assume the second is related to the first.) Apparently, according to other sources, this is due to the function being compiled twice. I am not sure what would be causing that though since that file is only #included once (by main()). What am I doing wrong or missing? What is the correct way to use structures and functions across multiple files? Thanks! EDIT: I removed the #include for the .c file and added function declarations before main() and it now seems to work! Is the lesson here, "Don't #include .c files"? |
|||
| Author: | DemonWasp [ Thu Jul 10, 2014 4:59 pm ] |
| Post subject: | RE:error LNK2005: _Function already defined in student.obj |
That's basically the lesson. The overall idea is that there may be several different implementations of a header (.h, .hpp, etc) file. For example, you might have a Windows version and a GNU/Linux version; or you might have a real version and a mocked version (for testing). Your code should only #include header files because the header files should contain only the interface for each module. The choice of which implementation to use occurs at compile-time. ...I think. I don't program C/C++ much. |
|
| Author: | Srlancelot39 [ Fri Jul 11, 2014 9:00 am ] |
| Post subject: | RE:error LNK2005: _Function already defined in student.obj |
That sounds about right. Okay, thanks! |
|