[llvm-bugs] [Bug 11876] missed null dereference warning

via llvm-bugs llvm-bugs at lists.llvm.org
Wed May 18 15:53:39 PDT 2016


https://llvm.org/bugs/show_bug.cgi?id=11876

Nick Lewycky <nlewycky at google.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |nlewycky at google.com
         Resolution|---                         |FIXED

--- Comment #1 from Nick Lewycky <nlewycky at google.com> ---
All better!

pr11876.cc:3:8: warning: reference cannot be bound to dereferenced null pointer
      in well-defined C++ code; comparison may be assumed to always evaluate to
      false [-Wtautological-undefined-compare]
  if (&obj == 0) return 0;
       ^~~    ~
pr11876.cc:7:7: warning: binding dereferenced null pointer to reference has
      undefined behavior [-Wnull-dereference]
  foo(*(Cls*)0);
      ^~~~~~~~
2 warnings generated.

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