[Bug libstdc++/108554] [12 Regression] Warning "null pointer dereferece" raised when extracting a unique_ptr from a map and any "-O" flag

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108554

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |11.3.0
      Known to fail|                            |12.2.0
   Target Milestone|---                         |12.3
            Summary|Warning "null pointer       |[12 Regression] Warning
                   |dereferece" raised when     |"null pointer dereferece"
                   |extracting a unique_ptr     |raised when extracting a
                   |from a map and any "-O"     |unique_ptr from a map and
                   |flag                        |any "-O" flag

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on trunk, but this should be backported to gcc-12 too.

The warning is present on older branches but suppressed by default, so it's not
important to backport before to older branches.