The file might be a part of a static library. Normally checking the output in the View->Output window should help find the full path of the files with both definitions.
Alternatively please try disabling syscall implementations via the first page of VisualGDB Project Properties.
Thank you for your reply. I have to tell you. Very few of these examples actually run properly on the STM32F7. For someone rushing to get up to speed on this platform it is extremely difficult.
Sorry about that. We do actually test our example projects and they do work out-of-the-box. Perhaps you have modified the default settings in a way the causes conflicts?
Either way, if you could attach the screenshots of the wizard steps you go through in order to create the project, we can advise you on what is going on.