[Bug c++/77388] Reference to a packed structure member

[andre.simoesdiasvieira at arm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77388

--- Comment #3 from Andre Vieira <andre.simoesdiasvieira at arm dot com> ---
Thank you Richard!

I have a follow up question. Why is this only a problem when passing by
reference and not when passing a pointer?

So say:
#define PACKED __attribute__ ((packed))

#define TYPE_C short

typedef struct {
    TYPE_C c;
} PACKED test_struct;

class A
{
  const TYPE_C * c;
public:
  A (const TYPE_C * _c) :
    c(_c) {};
};

class B
{
public:
  B();
  A foo ();
private:
  test_struct * s;
};

A B::foo ()
{
  return A (&(s->c));
}

Wouldn't there still be an alignment mismatch between A::c and s->c?