[LLVMbugs] [Bug 22636] Generated code crashes in -O2/-O3 because of template expansion

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Feb 19 14:41:05 PST 2015


Hal Finkel <hfinkel at anl.gov> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Hal Finkel <hfinkel at anl.gov> ---
Unfortunately, the source code provided is not valid. Specifically, binding a
null pointer to a reference in C++ produces undefined behavior. GCC does not
take advantage of this fact, but Clang does.

There was a note about this in the Clang 3.5 release notes. It says:

C++ Language Changes in Clang

- Reference parameters and return values from functions are more aggressively
  assumed to refer to valid objects when optimizing. Clang will attempt to
  issue a warning by default if it sees null checks being performed on
  references, and `-fsanitize=null` can be used to detect null references
  being formed at runtime.

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