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NIOS II linker cannot find function that is referenced in the main source file

Altera_Forum
Honored Contributor II
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Hello, 

 

Quite strange error appears while building project: 

 

undefined reference to `function1(unsigned long, unsigned long) 

 

function1 is located in one of the project source files and corresponding# include directive does present in the source file where function1 is referenced. 

 

Did someone experience such issues ? 

 

Thanks
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Altera_Forum
Honored Contributor II
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Problem is resolved but the cause of problem remains obscure. 

I changed extension of the file where function1 is defined ... from .c to .cpp

And it worked ... perhaps because the main source file (i.e. where is main function) is .cpp

Apparently, the g++ linker "doesn't like" mixing .c and .cpp sources.
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