Mutation testing has been out there for a while now, and it seems there are at least one or two commercial mutation testing frameworks for C/C++. Have you used them? What are yo
Mull is LLVM-based and seems to be actively developed and easy to use.
dextool mutate also LLVM-based and actively developed, more complicated to use but has more features like re-running alive mutants and only mutate introduced changes based on a git diff