How to go from linker error to line of code in the sources?

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http://stackoverflow.com – The linker produces this kind of output /var/tmp/ccITB4j2.o: In function `main': /var/tmp/ccITB4j2.o(.text+0x4): undefined reference to `myFunction(void)' How can I find out the line of source code corresponding to the instruction at .text+0x4 where the function is actually invoked? (HowTos)