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Failing to link my own function

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Join Date: May 2006

Posts: 7

Reputation: grautu is an unknown quantity at this point

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grautu

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Failing to link my own function

Jun 3rd, 2006

Hi!
As a beginner in Borland C++ Builder I'm facing a Linker Error message which I have no idea of how to deal with. Concretely, my console project called as "my_proj" is calling the function my_func() whose code definition is included in the source file source.cpp (this source file is included in the directory C:\PROGRAMS\my_proj\ together with all the files related to my_proj project). Well, when compiling the project, the following error message appears:

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[Linker Error]Error:Unresolved external 'my_func()' referenced from C:\PROGRAMS\MY_PROJ\DEBUG_BUILD\SOURCE.OBJ
[Linker Error]Error:Unresolved external 'my_func()' referenced from C:\PROGRAMS\MY_PROJ\DEBUG_BUILD\SOURCE.OBJ

As for the relevant content of my source file, it looks something like that

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void my_func(); 
int main() 
{ 
    my_func(); 
    return 0; 
} 
void my_func() 
{ 
   ... 
}
void my_func(); 
int main() 
{ 
    my_func(); 
    return 0; 
} 
void my_func() 
{ 
   ... 
}

A certain IDE setting might be relevant. Concretely, at "Tools > Options > C++ Options", the C:\PROGRAMS directory is set to be both the BPI/LIB output directory and the Package output directory as well. I've chosen that setting since seemed to me in accordance with my intention that C:\PROGRAMS host all my C++ projects.
Could anybody please tell me something useful about how to overcome the mentioned linker error?
Notice this is my first program that involves user-built functions.
Thanks for any idea!

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Join Date: Apr 2004

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Dave Sinkula Dave Sinkula is offline

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long time no c

Re: Failing to link my own function

Jun 3rd, 2006

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Originally Posted by grautu

Could anybody please tell me something useful about how to overcome the mentioned linker error?

Usually this means that much to your chagrin, you have not actually told the toolchain to build the file into your project.

"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand

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Join Date: Nov 2005

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sabuj

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Re: Failing to link my own function

Jun 7th, 2006

Make sure that the input locations(directories) that you have specified in the tools-options are correctly pointing to the required libraries and resources. Also check whether you missed a '\' in the directory name.(that is entering c:name instead of c:\name). Good luck