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I see (C99/C11 §6.3.2.3, #3). So the latter NULL definition only works poorly for variadic functions.

Is there any reason for an implementation to elect to use the non-casted version of NULL? It seems like an oversight.

Maybe arch with variable width pointer types like some embedded platforms?

How is integer zero better in that scenario, though? The (void-star)0 pointer can still be cast to the correct type (and will be for everything except variadic functions like printf).

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