DATA_ALIGNMENT vs. DECL_USER_ALIGNMENT

[David Edelsohn]

>>>>> Richard Kenner writes:

Richard> If only to objects, saying that an object is 1-byte aligned allows
Richard> *any* alignment.

	Yes.  64-bit S/390 requires 2-byte alignment.  The alignment can
be 2 or anything stricter than 2 for 64-bit S/390.  GNU Ada currently is
setting USER_ALIGN to 1 for some objects, which is breaking GNU Ada on
64-bit S/390.

Richard> But I can't find a macro that specifies an minimum alignment.  What is
Richard> it called?

	This would be a new macro, or result of querying an existing macro
with a test alignment of 1 byte to examine what modification to that
alignment a GCC port currently produces.

David