[cfe-dev] null pointer warning

[Chris Lattner]

Hi All,

I'm trying to implement a warning for PR7569, patch attached:

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The problem is that in SemaExpr, I don't know the surrounding context for a dereference, causing the warning to trigger on cases like this:

  void* t3 = &(*(void*)0);

While this is technically a null pointer dereference, warning about this isn't particularly useful.

Is there a better place to slot this into Sema?  I didn't follow the warning work John did, but it seems like it must have had to solve similar problems.

-Chris