* Szabolcs Nagy <nsz@port70.net> [2015-11-29 16:30:51 +0100]:
> -extern void (*const __init_array_start)(void), (*const __init_array_end)(void);
> +extern void (*const __init_array_start[])(void), (*const __init_array_end[])(void);

Alexander Monakov pointed out that the compiler may
consider arrays to be separate objects and then
f<__init_array_end would be ub.

attached an updated version, the same code is generated
on x86_64 as before, except there is no xor %eax,%eax
now before the call (because there is prototype).