Cannot Step Through Source Code
This problem is solved. This is what I did to solve it:
With the project selected in the Project Explorer panel I did these settings:
Project => Properties => C/C++ Build (Tree) => Settings => Tool Settings (Tab) => MCU GCC Compiler (Tree) => Optimization
In the "Optimization Level" list box field I selected "Optimize for Debug (-Og)
Project => Properties => C/C++ Build (Tree) => Settings => Tool Settings (Tab) => MCU GCC Compiler (Tree) => Debugging
In the "Debug Level" list box field I selected "Maximum (-g3)"