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From: "mattias.ellert at physics dot uu.se" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/104336] bogus -Wrestrict for std::string
 assignment with
Date: Mon, 25 Apr 2022 19:11:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104336

Mattias Ellert <mattias.ellert at physics dot uu.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mattias.ellert at physics =
dot uu.s
                   |                            |e

--- Comment #1 from Mattias Ellert <mattias.ellert at physics dot uu.se> ---
Created attachment 52872
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D52872&action=3Dedit
Proposed fix

Proposed fix:

``` {.diff}
--- usr/include/c++/12/bits/basic_string.tcc.orig       2022-04-14
01:23:43.000000000 +0200
+++ usr/include/c++/12/bits/basic_string.tcc    2022-04-25 16:18:57.0283521=
62
+0200
@@ -527,10 +527,10 @@
                    }
                  else
                    {
-                     const size_type __nleft =3D (__p + __len1) - __s;
-                     this->_S_move(__p, __s, __nleft);
-                     this->_S_copy(__p + __nleft, __p + __len2,
-                                   __len2 - __nleft);
+                     const size_type __nleft =3D (__s + __len2) - (__p +
__len1);
+                     this->_S_move(__p, __s, __len2 - __nleft);
+                     this->_S_copy(__p + __len2 - __nleft, __p + __len2,
+                                   __nleft);
                    }
                }
            }
```=