Clang has two types of diagnostics, errors and warnings. Errors arise when the code does not conform to the language. Such things as missing semi-colons and mismatched braces prevent compilation and will cause Clang to emit an error message.
On the other hand, warnings are emitted on questionable constructs on language conforming code. Over time, certain patterns have been determined to have a strong likelihood of being a programming mistake. Some examples of these include: order of operations confusion, mistaking similarly named language features, and easily made typos that still result in valid code.
Although warnings may have false positives, the utility of finding bugs early usually outweigh their downsides. Keep reading for a demonstration of Clang's warnings, as well as a comparison to GCC's warnings.
