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Create a new compiler warning. My guess is that it wouldn't be that difficult to add: add a warning for using sizeof() on a value whose type is the result of array-pointer decay. If you really want the size of the pointer, then you can change the function parameter's type to the pointer type, or use a cast.

There is/was a refactoring DSL for parsing and modifying C code accurately, but I don't recall the name. If I remember correctly, it was produced by a French organization or university.

You're probably thinking of http://coccinelle.lip6.fr/sp.php?

Yes, I think that's right.

Clang plugins are pretty cool. The LibreOffice project uses them reasonably extensively.