The usual suspect GCC toolchain coverage tool is gcov
https://en.wikipedia.org/wiki/Gcov
I don't have any experience with it. My Company uses Bullseye, however
it is not free or open source.
There are code coverage tools around, though I don't know any of them.
As a first start I thought it would be enough to go just straight (aka
"human code coverage analyzer" ;-)) and then increase the coverage
later. But I don't mind using such tools from beginning on. Do you
know any such tools or shall I look around?
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