On Symbian, I used BullseyeCoverage and Testwell CTC ++ . It is impossible to describe their pros and cons. In the end, they did their job. Both required some effort with customization and integration with an automated test suite. Both contain errors, for example, a downstream compiler crashed with slightly broken source code.
In Maemo, since the toolchain is based on GCC, I would suggest that gcov would be a good starting point. Although I have not worked on Maemo for a long time, and there was no coverage.
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