// compile-flags: -Z print-type-sizes --crate-type=lib
// build-pass
// ignore-pass
// ^-- needed because `--pass check` does not emit the output needed.
//     FIXME: consider using an attribute instead of side-effects.

// This file illustrates how packing is handled; it should cause
// the elimination of padding that would normally be introduced
// to satisfy alignment desirata.
//
// It avoids using u64/i64 because on some targets that is only 4-byte
// aligned (while on most it is 8-byte aligned) and so the resulting
// padding and overall computed sizes can be quite different.

#![allow(dead_code)]

#[derive(Default)]
#[repr(packed)]
pub struct Packed1 {
    a: u8,
    b: u8,
    g: i32,
    c: u8,
    h: i16,
    d: u8,
}

#[derive(Default)]
#[repr(packed(2))]
pub struct Packed2 {
    a: u8,
    b: u8,
    g: i32,
    c: u8,
    h: i16,
    d: u8,
}

#[derive(Default)]
#[repr(packed(2))]
#[repr(C)]
pub struct Packed2C {
    a: u8,
    b: u8,
    g: i32,
    c: u8,
    h: i16,
    d: u8,
}

#[derive(Default)]
pub struct Padded {
    a: u8,
    b: u8,
    g: i32,
    c: u8,
    h: i16,
    d: u8,
}