https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79572

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |NEW
                 CC|                            |dodji at gcc dot gnu.org,
                   |                            |dvyukov at gcc dot gnu.org,
                   |                            |jakub at gcc dot gnu.org,
                   |                            |kcc at gcc dot gnu.org
          Component|c++                         |sanitizer
         Resolution|INVALID                     |---
            Summary|[6/7 Regression] Segfault   |[6/7 Regression] reference
                   |with -O1 and higher on null |binding to null pointer not
                   |reference                   |reported with
                   |                            |-fsanitize=undefined

--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
This is an -fsanitize=undefined regression.

5.4.1 gives:
  runtime error: reference binding to null pointer of type 'const int
6 and trunk:
 No runtime error is reported.

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