Nios II IDE shows “Source not found” during debugging

Description

When you are debugging a project in Nios II IDE and attempt to step into the printf() function, you might see an error message saying Source not found.

Resolution

Port your project to the Nios II SBT for Eclipse for future software development and debugging purposes, as described in the Using the Nios II Integrated Development Environment appendix of the Nios II Software Developer’s Handbook.