[llvm-bugs] [Bug 31781] -Wunused-const-variable doesn't warn for ObjC types if ARC is enabled

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31781

Saleem Abdulrasool <compnerd at compnerd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |dgregor at apple.com,
                   |                            |rjmccall at apple.com
         Resolution|---                         |INVALID

--- Comment #1 from Saleem Abdulrasool <compnerd at compnerd.org> ---
Doug and John can correct me if I am wrong, but I believe that the current
behavior is correct.

The lifetime is being extended here.  The type can have a dealloc method that
performs some operation with unknown side-effects.  By eliminating the type, we
have changed the semantics of the program.  Since this can occur by other means
at load time, we cannot actually determine if the type is actually unused.  So,
we would give a false warning here.

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