https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100005
--- Comment #4 from Thiago Macieira <thiago at kde dot org> ---
That's an artificial (pun intended) limitation.
In C++:
template <typename Generator>
int fill_array(Generator generator, unsigned long long *rand_array)
Also errors out with the same error, but works if you do:
fill_array([](auto x) { return _rdrand64_step(x); }, rand_array);
The extra indirection shouldn't be required.
PS: clang compiles the same code just fine.
