# Pre13 L-C2

The two planned zero-length on-disk tail arrays now use standard flexible array
declarators:

- `erofs_xattr_ibody_header::h_shared_xattrs`
- `erofs_xattr_long_prefix::infix`

The layout probe retains the previous `[0]` declarations and asserts equal
structure size/alignment and member offsets. Host Clang accepts both old and
new declarations with the same warning/error result and identical layouts.
The probe is also retained for the final FreeBSD guest compiler gate.

No KLD build, QEMU, smoke, or feature test was run for this batch.