[Bug tree-optimization/124183] Erroneous -Wformat-truncation= warning using -O3

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124183

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |INVALID

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So -O3 unswitches the loop as there is a condition about null check from
std::string construction. You can see the same warning via `-O2
-funswitch-loops ` too.