[Bug c/118233] -Werror=stringop-overflow __builtin___memcpy_chk

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118233

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>18446744073709551608 and 18446744073709551613
-8 and -3 .


Some how GCC decided the range of new_path.len is [-8, -3].
   new_path.type = 2;
   new_path.len = pathlen - bMatch - 2;

   memcpy(new_path.value, &(path[bMatch + 2]), new_path.len);


I have not exactly looked into why though.

It would mean that `pathlen < bMatch`