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Interesting, I wasn't aware of that and thought the compiler would at least throw up a warning if it had seen that function prototype.

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It's not intuitive, although arguably conforms to the general C philosophy of not getting in the way unless the code has no chance of being right.

For example, both compilers do complain if you try to pass a literal NULL to `f1` (because that can't possibly be right), the same way they warn about division by a literal zero but give no warnings about dividing by a number that is not known to be nonzero.

Right, so if the value is known at compile time it will flag the error but if it only appears at runtime it will happily consume the null and wreak whatever havoc that will lead to further down the line. Ok, thank you for pointing this out, I must have held that misconception for a really long time.

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