https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91483
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Related test:
void
foo ()
{
constexpr int a = 0;
constexpr const int *p = &a;
}
We just say
error: ‘& a’ is not a constant expression
but that's inadequate. clang++ now says
note: address of non-static constexpr variable 'a' may differ on each
invocation of the enclosing function; add 'static' to give it a constant
address
