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While we are at it, here are some more useful warning flags I have used: https://github.com/cpp-best-practices/cppbestpractices/blob/.... Some C++-only though, some are a bit opinionated (like -Wsign-conversion) and some useful C-only flags might be missing.

Few C-specific references I found just now, but haven't tried myself yet:

https://github.com/systemd/systemd/blob/0885e4a6e7ca93d3aef8... https://github.com/airbus-seclab/c-compiler-security

Also a good idea to regularly run the program with sanitizers, using them in tests is a good way to do that I think. Why not during development as well if the performance is acceptable for that specific program.