I was inspired while watching a talk by Kevin Ottens about refactoring OpenGL code in Qt to take a look at gcov & lcov. gcov is used to analyze code coverage – which lines of code have actually been executed while running an application. lcov is a tool that can produce HTML reports from the gcov output.
If you have a suite of unit tests that you run on your code, you can use these tools to see which the lines of code are covered by your tests and which are not.
I couldn’t find a decent primer on how to set this up properly for my Qt projects on macOS so I could run it from Qt Creator, so I thought I’d write up how I did it.