+Thu Oct 16 15:43:26 1997 Mike Stump (mrs@wrs.com)
+
+ * c-decl.c (start_struct): Ensure that structs with forward
+ declarations are in fact packed when -fpack-struct is given.
+
+ * stor-layout.c (layout_record): Ignore STRUCTURE_SIZE_BOUNDARY if
+ we are packing a structure. This allows a structure with only
+ bytes to be aligned on a byte boundary and have no padding on a
+ m68k.
+
Thu Oct 16 15:17:54 1997 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* rs6000.h (ROUND_TYPE_ALIGN): Don't blow up if no fields in record.
if (ref && TREE_CODE (ref) == code)
{
C_TYPE_BEING_DEFINED (ref) = 1;
+ TYPE_PACKED (ref) = flag_pack_struct;
if (TYPE_FIELDS (ref))
error ((code == UNION_TYPE ? "redefinition of `union %s'"
: "redefinition of `struct %s'"),
tree rec;
{
register tree field;
-#ifdef STRUCTURE_SIZE_BOUNDARY
- unsigned record_align = MAX (STRUCTURE_SIZE_BOUNDARY, TYPE_ALIGN (rec));
-#else
unsigned record_align = MAX (BITS_PER_UNIT, TYPE_ALIGN (rec));
-#endif
/* These must be laid out *after* the record is. */
tree pending_statics = NULL_TREE;
/* Record size so far is CONST_SIZE + VAR_SIZE bits,
that we know VAR_SIZE has. */
register int var_align = BITS_PER_UNIT;
+#ifdef STRUCTURE_SIZE_BOUNDARY
+ /* Packed structures don't need to have minimum size. */
+ if (! TYPE_PACKED (rec))
+ record_align = MAX (record_align, STRUCTURE_SIZE_BOUNDARY);
+#endif
for (field = TYPE_FIELDS (rec); field; field = TREE_CHAIN (field))
{
tree rec;
{
register tree field;
-#ifdef STRUCTURE_SIZE_BOUNDARY
- unsigned union_align = STRUCTURE_SIZE_BOUNDARY;
-#else
unsigned union_align = BITS_PER_UNIT;
-#endif
/* The size of the union, based on the fields scanned so far,
is max (CONST_SIZE, VAR_SIZE).
register int const_size = 0;
register tree var_size = 0;
+#ifdef STRUCTURE_SIZE_BOUNDARY
+ /* Packed structures don't need to have minimum size. */
+ if (! TYPE_PACKED (rec))
+ union_align = STRUCTURE_SIZE_BOUNDARY;
+#endif
+
/* If this is a QUAL_UNION_TYPE, we want to process the fields in
the reverse order in building the COND_EXPR that denotes its
size. We reverse them again later. */