[Bug c++/71892] Recent optimization changes introduce bugs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71892

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
-fno-delete-null-pointer-checks

For the not deleting null pointer checks.  The other bug report has the other
option specified already.

C++ and C have undefined behavior in them.  Learning this for the first time
sometimes can be a shock but once you learn the optimizing compiler optimizes
code better you will understand why.

Also For the null pointer check, you can use -fsantizer=undefined to find the
undefined behavior in your code.