[Bug target/114615] spurious warning on mingw-w64: 'memcpy' reading 4 or more bytes from a region of size 2 with std::wstring{L""} and -flto -O1 [Wstringop-overread]

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114615

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The dumb part is that __n here comes from wcslen(__s2), so the compiler is able
to track that __s2 is only two bytes, but not capable of tracking that __n ==
0.

Specifically, __n is (__s2 + wcslen(__s2)) - __s2 which is just wcslen(L"")
which is 0.