diff options
Diffstat (limited to 'gcc/stor-layout.c')
| -rw-r--r-- | gcc/stor-layout.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/gcc/stor-layout.c b/gcc/stor-layout.c index 0e7caa5450b..1a33b1c54d6 100644 --- a/gcc/stor-layout.c +++ b/gcc/stor-layout.c @@ -937,7 +937,9 @@ place_field (record_layout_info rli, tree field) && TREE_CODE (field) == FIELD_DECL && type != error_mark_node && DECL_BIT_FIELD (field) - && ! DECL_PACKED (field) + && (! DECL_PACKED (field) + /* Enter for these packed fields only to issue a warning. */ + || TYPE_ALIGN (type) <= BITS_PER_UNIT) && maximum_field_alignment == 0 && ! integer_zerop (DECL_SIZE (field)) && host_integerp (DECL_SIZE (field), 1) @@ -958,9 +960,21 @@ place_field (record_layout_info rli, tree field) /* A bit field may not span more units of alignment of its type than its type itself. Advance to next boundary if necessary. */ if (excess_unit_span (offset, bit_offset, field_size, type_align, type)) - rli->bitpos = round_up (rli->bitpos, type_align); + { + if (DECL_PACKED (field)) + { + if (warn_packed_bitfield_compat == 1) + inform + (input_location, + "Offset of packed bit-field %qD has changed in GCC 4.4", + field); + } + else + rli->bitpos = round_up (rli->bitpos, type_align); + } - TYPE_USER_ALIGN (rli->t) |= TYPE_USER_ALIGN (type); + if (! DECL_PACKED (field)) + TYPE_USER_ALIGN (rli->t) |= TYPE_USER_ALIGN (type); } #endif |