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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/96963] [10/11 Regression] -Wstringop-overflow
 false positive on -O3 or -O2 -ftree-vectorize when assigning
 consecutive char struct members
Date: Mon, 07 Dec 2020 10:43:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96963

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |10.2.0, 11.0
      Known to work|                            |9.3.0
   Target Milestone|---                         |10.3
            Summary|-Wstringop-overflow false   |[10/11 Regression]
                   |positive on -O3 or -O2      |-Wstringop-overflow false
                   |-ftree-vectorize when       |positive on -O3 or -O2
                   |assigning consecutive char  |-ftree-vectorize when
                   |struct members              |assigning consecutive char
                   |                            |struct members

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This produces tons of false positives for correct code that uses std::string
and std::vector, due to the empty std::allocator objects used as default
arguments of constructors.=