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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107087] bits/stl_algobase.h:431: warning:
 'void* __builtin_memcpy(void*, const void*, unsigned int)' reading between 8
 and 2147483644 bytes from a region of size 4 [-Wstringop-overread]
Date: Thu, 09 Mar 2023 20:48:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107087

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 54628
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54628&action=3Dedit
Gzipped preprocessed output

Similar errors for this code with -std=3Dc++20 -O2:

#include <vector>=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20

void test01()
{
  std::vector<int> v1, v2{5, 6};
  int n =3D 0;
  std::vector<int>::iterator it =3D v1.insert(v1.cbegin(), n);
  it =3D v1.insert(v1.cbegin(), 1);
  it =3D v1.insert(v1.cbegin(), {2, 3});
  it =3D v1.insert(v1.cbegin(), 1, 4);
  it =3D v1.insert(v1.cbegin(), v2.begin(), v2.end());
}=