[Bug malloc/20137] aligned_alloc should fail for bad size / alignment [DR#460]

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20137

--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
To be clear, the use case I'm thinking about is allocating storage for an
object of this type:

  struct flexible
  {
     _Decimal128 value;
     char formatted[];
  };

Doing something like this (with error checking) looks reasonable to me:

  size_t length = strlen (formatted);
  struct flexible *p = aligned_alloc (_Alignof (struct flexible),
                                      offsetof (struct flexible, formatted)
                                      + length + 1);
  p->value = value;
  memcpy (p->formatted, formatted, length + 1);

I'm surprised this isn't recognized as a useful coding pattern.

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