[Bug c++/102022] incorrect code with -O2

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102022

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
You could use *(void **) which GCC(!) treats conservative.  But yes, *(char
**)&head should use memcpy to be truly portable.