Warnings to determine unsafe casts clang?

I don't think that clang directly warns about the situation you are looking for. However, it is reasonably simple to create a plug-in detecting all uses of C-style casts and/or reinterpret_cast() s. There is an example of how to create a plug-in in the tools/clang/examples/PrintFunctionNames directory if you have a source tree.

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Well the easiest way which comes in mind is simply find/replace all reinterpret_cast with static_cast and compile - GCC will give you a bunch of errors about invalid static_cast.

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