diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9c2d328069..031efe676c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -89,6 +89,20 @@ Released YYYY/MM/DD
 
 * TODO (or remove section if none)
 
+
+--------------------------------------------------------------------------------
+
+# 0.48.0
+
+Released 2019/03/04
+
+## Changed
+
+* Default rust target was changed to 1.33, which means that bindgen can get much
+  more often the layout of structs right. [#1529][]
+
+[#1529]: https://github.com/rust-lang-nursery/rust-bindgen/issues/1529
+
 --------------------------------------------------------------------------------
 
 # 0.47.3
diff --git a/Cargo.lock b/Cargo.lock
index 4634e28e21..34e54e9b31 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -49,7 +49,7 @@ dependencies = [
 
 [[package]]
 name = "bindgen"
-version = "0.47.3"
+version = "0.48.0"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "cexpr 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index bebbbffe35..7e0b014b4d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ readme = "README.md"
 repository = "https://github.com/rust-lang/rust-bindgen"
 documentation = "https://docs.rs/bindgen"
 homepage = "https://rust-lang.github.io/rust-bindgen/"
-version = "0.47.3"
+version = "0.48.0"
 build = "build.rs"
 
 include = [
diff --git a/src/features.rs b/src/features.rs
index b5a6340246..50759c3189 100644
--- a/src/features.rs
+++ b/src/features.rs
@@ -114,7 +114,7 @@ rust_target_base!(rust_target_def);
 rust_target_base!(rust_target_values_def);
 
 /// Latest stable release of Rust
-pub const LATEST_STABLE_RUST: RustTarget = RustTarget::Stable_1_21;
+pub const LATEST_STABLE_RUST: RustTarget = RustTarget::Stable_1_33;
 
 /// Create RustFeatures struct definition, new(), and a getter for each field
 macro_rules! rust_feature_def {
diff --git a/tests/expectations/tests/16-byte-alignment.rs b/tests/expectations/tests/16-byte-alignment.rs
index 84383c3575..9f19d212d0 100644
--- a/tests/expectations/tests/16-byte-alignment.rs
+++ b/tests/expectations/tests/16-byte-alignment.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Copy, Clone)]
@@ -12,6 +15,7 @@ pub struct rte_ipv4_tuple {
     pub __bindgen_anon_1: rte_ipv4_tuple__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union rte_ipv4_tuple__bindgen_ty_1 {
     pub __bindgen_anon_1: rte_ipv4_tuple__bindgen_ty_1__bindgen_ty_1,
@@ -145,6 +149,7 @@ pub struct rte_ipv6_tuple {
     pub __bindgen_anon_1: rte_ipv6_tuple__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union rte_ipv6_tuple__bindgen_ty_1 {
     pub __bindgen_anon_1: rte_ipv6_tuple__bindgen_ty_1__bindgen_ty_1,
@@ -271,11 +276,12 @@ impl Default for rte_ipv6_tuple {
     }
 }
 #[repr(C)]
+#[repr(align(16))]
 #[derive(Copy, Clone)]
 pub union rte_thash_tuple {
     pub v4: rte_ipv4_tuple,
     pub v6: rte_ipv6_tuple,
-    _bindgen_union_align: [u8; 48usize],
+    _bindgen_union_align: [u128; 3usize],
 }
 #[test]
 fn bindgen_test_layout_rte_thash_tuple() {
@@ -284,6 +290,11 @@ fn bindgen_test_layout_rte_thash_tuple() {
         48usize,
         concat!("Size of: ", stringify!(rte_thash_tuple))
     );
+    assert_eq!(
+        ::std::mem::align_of::<rte_thash_tuple>(),
+        16usize,
+        concat!("Alignment of ", stringify!(rte_thash_tuple))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<rte_thash_tuple>())).v4 as *const _ as usize },
         0usize,
diff --git a/tests/expectations/tests/annotation_hide.rs b/tests/expectations/tests/annotation_hide.rs
index d59ed05cf7..49a771ac6b 100644
--- a/tests/expectations/tests/annotation_hide.rs
+++ b/tests/expectations/tests/annotation_hide.rs
@@ -9,6 +9,7 @@
 
 /// <div rustbindgen opaque></div>
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct D {
     pub _bindgen_opaque_blob: u32,
diff --git a/tests/expectations/tests/anon_struct_in_union.rs b/tests/expectations/tests/anon_struct_in_union.rs
index 6916d5afe8..40c56b9ad2 100644
--- a/tests/expectations/tests/anon_struct_in_union.rs
+++ b/tests/expectations/tests/anon_struct_in_union.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Copy, Clone)]
@@ -10,6 +13,7 @@ pub struct s {
     pub u: s__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union s__bindgen_ty_1 {
     pub field: s__bindgen_ty_1_inner,
diff --git a/tests/expectations/tests/anon_union.rs b/tests/expectations/tests/anon_union.rs
index a9b6029234..c086e73813 100644
--- a/tests/expectations/tests/anon_union.rs
+++ b/tests/expectations/tests/anon_union.rs
@@ -33,6 +33,7 @@ pub struct TErrorResult_DOMExceptionInfo {
     _unused: [u8; 0],
 }
 #[repr(C)]
+#[repr(align(8))]
 pub union TErrorResult__bindgen_ty_1 {
     pub mMessage: *mut TErrorResult_Message,
     pub mDOMExceptionInfo: *mut TErrorResult_DOMExceptionInfo,
diff --git a/tests/expectations/tests/bitfield-enum-basic.rs b/tests/expectations/tests/bitfield-enum-basic.rs
index 2142776e65..7a3dd3562b 100644
--- a/tests/expectations/tests/bitfield-enum-basic.rs
+++ b/tests/expectations/tests/bitfield-enum-basic.rs
@@ -45,7 +45,7 @@ impl ::std::ops::BitAndAssign for Foo {
         self.0 &= rhs.0;
     }
 }
-#[repr(C)]
+#[repr(transparent)]
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct Foo(pub i32);
 impl Buz {
@@ -86,7 +86,7 @@ impl ::std::ops::BitAndAssign for Buz {
         self.0 &= rhs.0;
     }
 }
-#[repr(C)]
+#[repr(transparent)]
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct Buz(pub i8);
 pub const NS_FOO: _bindgen_ty_1 = _bindgen_ty_1(1);
@@ -117,7 +117,7 @@ impl ::std::ops::BitAndAssign for _bindgen_ty_1 {
         self.0 &= rhs.0;
     }
 }
-#[repr(C)]
+#[repr(transparent)]
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct _bindgen_ty_1(pub u32);
 #[repr(C)]
@@ -153,7 +153,7 @@ impl ::std::ops::BitAndAssign for Dummy__bindgen_ty_1 {
         self.0 &= rhs.0;
     }
 }
-#[repr(C)]
+#[repr(transparent)]
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct Dummy__bindgen_ty_1(pub u32);
 #[test]
diff --git a/tests/expectations/tests/bitfield-large.rs b/tests/expectations/tests/bitfield-large.rs
index 408c2a0ed5..1791cd32ca 100644
--- a/tests/expectations/tests/bitfield-large.rs
+++ b/tests/expectations/tests/bitfield-large.rs
@@ -90,6 +90,7 @@ where
     }
 }
 #[repr(C)]
+#[repr(align(16))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct HasBigBitfield {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 16usize], u64>,
@@ -101,8 +102,37 @@ fn bindgen_test_layout_HasBigBitfield() {
         16usize,
         concat!("Size of: ", stringify!(HasBigBitfield))
     );
+    assert_eq!(
+        ::std::mem::align_of::<HasBigBitfield>(),
+        16usize,
+        concat!("Alignment of ", stringify!(HasBigBitfield))
+    );
+}
+impl HasBigBitfield {
+    #[inline]
+    pub fn x(&self) -> i128 {
+        unsafe { ::std::mem::transmute(self._bitfield_1.get(0usize, 128u8) as u128) }
+    }
+    #[inline]
+    pub fn set_x(&mut self, val: i128) {
+        unsafe {
+            let val: u128 = ::std::mem::transmute(val);
+            self._bitfield_1.set(0usize, 128u8, val as u64)
+        }
+    }
+    #[inline]
+    pub fn new_bitfield_1(x: i128) -> __BindgenBitfieldUnit<[u8; 16usize], u64> {
+        let mut __bindgen_bitfield_unit: __BindgenBitfieldUnit<[u8; 16usize], u64> =
+            Default::default();
+        __bindgen_bitfield_unit.set(0usize, 128u8, {
+            let x: u128 = unsafe { ::std::mem::transmute(x) };
+            x as u64
+        });
+        __bindgen_bitfield_unit
+    }
 }
 #[repr(C)]
+#[repr(align(16))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct HasTwoBigBitfields {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 16usize], u64>,
@@ -114,4 +144,47 @@ fn bindgen_test_layout_HasTwoBigBitfields() {
         16usize,
         concat!("Size of: ", stringify!(HasTwoBigBitfields))
     );
+    assert_eq!(
+        ::std::mem::align_of::<HasTwoBigBitfields>(),
+        16usize,
+        concat!("Alignment of ", stringify!(HasTwoBigBitfields))
+    );
+}
+impl HasTwoBigBitfields {
+    #[inline]
+    pub fn x(&self) -> i128 {
+        unsafe { ::std::mem::transmute(self._bitfield_1.get(0usize, 80u8) as u128) }
+    }
+    #[inline]
+    pub fn set_x(&mut self, val: i128) {
+        unsafe {
+            let val: u128 = ::std::mem::transmute(val);
+            self._bitfield_1.set(0usize, 80u8, val as u64)
+        }
+    }
+    #[inline]
+    pub fn y(&self) -> i128 {
+        unsafe { ::std::mem::transmute(self._bitfield_1.get(80usize, 48u8) as u128) }
+    }
+    #[inline]
+    pub fn set_y(&mut self, val: i128) {
+        unsafe {
+            let val: u128 = ::std::mem::transmute(val);
+            self._bitfield_1.set(80usize, 48u8, val as u64)
+        }
+    }
+    #[inline]
+    pub fn new_bitfield_1(x: i128, y: i128) -> __BindgenBitfieldUnit<[u8; 16usize], u64> {
+        let mut __bindgen_bitfield_unit: __BindgenBitfieldUnit<[u8; 16usize], u64> =
+            Default::default();
+        __bindgen_bitfield_unit.set(0usize, 80u8, {
+            let x: u128 = unsafe { ::std::mem::transmute(x) };
+            x as u64
+        });
+        __bindgen_bitfield_unit.set(80usize, 48u8, {
+            let y: u128 = unsafe { ::std::mem::transmute(y) };
+            y as u64
+        });
+        __bindgen_bitfield_unit
+    }
 }
diff --git a/tests/expectations/tests/bitfield_align.rs b/tests/expectations/tests/bitfield_align.rs
index c7758c5a04..35e9479bab 100644
--- a/tests/expectations/tests/bitfield_align.rs
+++ b/tests/expectations/tests/bitfield_align.rs
@@ -90,12 +90,12 @@ where
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct A {
     pub x: ::std::os::raw::c_uchar,
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 2usize], u8>,
     pub y: ::std::os::raw::c_uchar,
-    pub __bindgen_align: [u32; 0usize],
 }
 #[test]
 fn bindgen_test_layout_A() {
@@ -290,10 +290,10 @@ impl A {
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct B {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 4usize], u32>,
-    pub __bindgen_align: [u32; 0usize],
 }
 #[test]
 fn bindgen_test_layout_B() {
@@ -421,11 +421,11 @@ impl C {
     }
 }
 #[repr(C)]
+#[repr(align(2))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Date1 {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 3usize], u8>,
     pub __bindgen_padding_0: u8,
-    pub __bindgen_align: [u16; 0usize],
 }
 #[test]
 fn bindgen_test_layout_Date1() {
@@ -514,10 +514,10 @@ impl Date1 {
     }
 }
 #[repr(C)]
+#[repr(align(2))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Date2 {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 4usize], u8>,
-    pub __bindgen_align: [u16; 0usize],
 }
 #[test]
 fn bindgen_test_layout_Date2() {
@@ -622,11 +622,11 @@ impl Date2 {
     }
 }
 #[repr(C)]
+#[repr(align(2))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Date3 {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 3usize], u8>,
     pub byte: ::std::os::raw::c_uchar,
-    pub __bindgen_align: [u16; 0usize],
 }
 #[test]
 fn bindgen_test_layout_Date3() {
diff --git a/tests/expectations/tests/bitfield_align_2.rs b/tests/expectations/tests/bitfield_align_2.rs
index 39ab0eeff8..6f93397fc6 100644
--- a/tests/expectations/tests/bitfield_align_2.rs
+++ b/tests/expectations/tests/bitfield_align_2.rs
@@ -98,10 +98,10 @@ pub enum MyEnum {
     FOUR = 3,
 }
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Debug, Copy, Clone)]
 pub struct TaggedPtr {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 8usize], u64>,
-    pub __bindgen_align: [u64; 0usize],
 }
 #[test]
 fn bindgen_test_layout_TaggedPtr() {
diff --git a/tests/expectations/tests/bitfield_large_overflow.rs b/tests/expectations/tests/bitfield_large_overflow.rs
index e5b254cf76..7df5b937f8 100644
--- a/tests/expectations/tests/bitfield_large_overflow.rs
+++ b/tests/expectations/tests/bitfield_large_overflow.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct _bindgen_ty_1 {
     pub _bindgen_opaque_blob: [u64; 10usize],
diff --git a/tests/expectations/tests/bitfield_method_mangling.rs b/tests/expectations/tests/bitfield_method_mangling.rs
index 0089d2c7af..8ebb778d69 100644
--- a/tests/expectations/tests/bitfield_method_mangling.rs
+++ b/tests/expectations/tests/bitfield_method_mangling.rs
@@ -90,10 +90,10 @@ where
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct mach_msg_type_descriptor_t {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 4usize], u32>,
-    pub __bindgen_align: [u32; 0usize],
 }
 #[test]
 fn bindgen_test_layout_mach_msg_type_descriptor_t() {
diff --git a/tests/expectations/tests/class.rs b/tests/expectations/tests/class.rs
index f52f0f8580..3fda629b7b 100644
--- a/tests/expectations/tests/class.rs
+++ b/tests/expectations/tests/class.rs
@@ -335,6 +335,7 @@ impl Default for IncompleteArrayNonCopiable {
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union Union {
     pub d: f32,
diff --git a/tests/expectations/tests/class_with_inner_struct.rs b/tests/expectations/tests/class_with_inner_struct.rs
index 265d7c5bfc..d055cfbc20 100644
--- a/tests/expectations/tests/class_with_inner_struct.rs
+++ b/tests/expectations/tests/class_with_inner_struct.rs
@@ -1,6 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Copy, Clone)]
@@ -49,6 +54,7 @@ fn bindgen_test_layout_A_Segment() {
     );
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union A__bindgen_ty_1 {
     pub f: ::std::os::raw::c_int,
@@ -83,6 +89,7 @@ impl Default for A__bindgen_ty_1 {
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union A__bindgen_ty_2 {
     pub d: ::std::os::raw::c_int,
@@ -226,6 +233,7 @@ pub struct C {
     pub __bindgen_anon_1: C__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union C__bindgen_ty_1 {
     pub mFunc: C__bindgen_ty_1__bindgen_ty_1,
diff --git a/tests/expectations/tests/convert-floats.rs b/tests/expectations/tests/convert-floats.rs
index e6abee16d6..325fc267e4 100644
--- a/tests/expectations/tests/convert-floats.rs
+++ b/tests/expectations/tests/convert-floats.rs
@@ -19,7 +19,7 @@ pub struct foo {
     pub bar: ::std::os::raw::c_float,
     pub baz: ::std::os::raw::c_float,
     pub bazz: ::std::os::raw::c_double,
-    pub bazzz: *mut f64,
+    pub bazzz: *mut u128,
     pub complexFloat: __BindgenComplex<::std::os::raw::c_float>,
     pub complexDouble: __BindgenComplex<::std::os::raw::c_double>,
 }
diff --git a/tests/expectations/tests/derive-debug-mangle-name.rs b/tests/expectations/tests/derive-debug-mangle-name.rs
index fbf518bdf7..ca9e7e213f 100644
--- a/tests/expectations/tests/derive-debug-mangle-name.rs
+++ b/tests/expectations/tests/derive-debug-mangle-name.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Copy, Clone)]
@@ -12,6 +15,7 @@ pub struct perf_event_attr {
     pub __bindgen_anon_1: perf_event_attr__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union perf_event_attr__bindgen_ty_1 {
     pub b: ::std::os::raw::c_int,
@@ -104,9 +108,7 @@ impl ::std::fmt::Debug for perf_event_attr {
         write!(
             f,
             "perf_event_attr {{ type: {:?}, a: {:?}, __bindgen_anon_1: {:?} }}",
-            self.type_,
-            self.a,
-            self.__bindgen_anon_1
+            self.type_, self.a, self.__bindgen_anon_1
         )
     }
 }
diff --git a/tests/expectations/tests/derive-debug-opaque.rs b/tests/expectations/tests/derive-debug-opaque.rs
index d7f8878b94..bc7d9fd6be 100644
--- a/tests/expectations/tests/derive-debug-opaque.rs
+++ b/tests/expectations/tests/derive-debug-opaque.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(4))]
 pub struct Opaque {
     pub _bindgen_opaque_blob: [u32; 41usize],
 }
diff --git a/tests/expectations/tests/derive-partialeq-anonfield.rs b/tests/expectations/tests/derive-partialeq-anonfield.rs
index 73972d70d7..1d38b0b627 100644
--- a/tests/expectations/tests/derive-partialeq-anonfield.rs
+++ b/tests/expectations/tests/derive-partialeq-anonfield.rs
@@ -1,15 +1,20 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(64))]
 #[derive(Copy, Clone)]
 pub struct rte_mbuf {
     pub __bindgen_anon_1: rte_mbuf__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(1))]
 #[derive(Copy, Clone)]
 pub union rte_mbuf__bindgen_ty_1 {
     _bindgen_union_align: [u8; 0usize],
@@ -39,6 +44,11 @@ fn bindgen_test_layout_rte_mbuf() {
         0usize,
         concat!("Size of: ", stringify!(rte_mbuf))
     );
+    assert_eq!(
+        ::std::mem::align_of::<rte_mbuf>(),
+        64usize,
+        concat!("Alignment of ", stringify!(rte_mbuf))
+    );
 }
 impl Default for rte_mbuf {
     fn default() -> Self {
diff --git a/tests/expectations/tests/derive-partialeq-pointer.rs b/tests/expectations/tests/derive-partialeq-pointer.rs
index 4ce1a3fe3f..ea1b88a287 100644
--- a/tests/expectations/tests/derive-partialeq-pointer.rs
+++ b/tests/expectations/tests/derive-partialeq-pointer.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
@@ -38,6 +41,7 @@ pub struct c {
     pub __bindgen_anon_1: c__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(1))]
 #[derive(Copy, Clone)]
 pub union c__bindgen_ty_1 {
     _bindgen_union_align: u8,
diff --git a/tests/expectations/tests/derive-partialeq-union.rs b/tests/expectations/tests/derive-partialeq-union.rs
index a271f41032..5adbca1f97 100644
--- a/tests/expectations/tests/derive-partialeq-union.rs
+++ b/tests/expectations/tests/derive-partialeq-union.rs
@@ -9,6 +9,7 @@
 
 /// Deriving PartialEq for rust unions is not supported.
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union ShouldNotDerivePartialEq {
     pub a: ::std::os::raw::c_char,
diff --git a/tests/expectations/tests/doggo-or-null.rs b/tests/expectations/tests/doggo-or-null.rs
index 5a7aa86f92..216889146e 100644
--- a/tests/expectations/tests/doggo-or-null.rs
+++ b/tests/expectations/tests/doggo-or-null.rs
@@ -55,6 +55,7 @@ fn bindgen_test_layout_Null() {
 /// probably emit an opaque struct for opaque unions... but until then, we have
 /// this test to make sure that opaque unions don't derive and still compile.
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union DoggoOrNull {
     pub _bindgen_opaque_blob: u32,
diff --git a/tests/expectations/tests/enum-default-bitfield.rs b/tests/expectations/tests/enum-default-bitfield.rs
index 19172d0b49..a5ba04efba 100644
--- a/tests/expectations/tests/enum-default-bitfield.rs
+++ b/tests/expectations/tests/enum-default-bitfield.rs
@@ -1,6 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 impl Foo {
     pub const Bar: Foo = Foo(0);
@@ -34,7 +39,7 @@ impl ::std::ops::BitAndAssign for Foo {
         self.0 &= rhs.0;
     }
 }
-#[repr(C)]
+#[repr(transparent)]
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct Foo(pub u32);
 pub mod Neg {
diff --git a/tests/expectations/tests/enum-doc-bitfield.rs b/tests/expectations/tests/enum-doc-bitfield.rs
index 9ebfc10e40..5fe668be07 100644
--- a/tests/expectations/tests/enum-doc-bitfield.rs
+++ b/tests/expectations/tests/enum-doc-bitfield.rs
@@ -60,7 +60,7 @@ impl ::std::ops::BitAndAssign for B {
         self.0 &= rhs.0;
     }
 }
-#[repr(C)]
+#[repr(transparent)]
 /// Document enum
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct B(pub u32);
diff --git a/tests/expectations/tests/issue-1198-alias-rust-bitfield-enum.rs b/tests/expectations/tests/issue-1198-alias-rust-bitfield-enum.rs
index 8c70625e37..8c58b232c7 100644
--- a/tests/expectations/tests/issue-1198-alias-rust-bitfield-enum.rs
+++ b/tests/expectations/tests/issue-1198-alias-rust-bitfield-enum.rs
@@ -1,6 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 impl MyDupeEnum {
     pub const A: MyDupeEnum = MyDupeEnum(0);
@@ -37,7 +42,7 @@ impl ::std::ops::BitAndAssign for MyDupeEnum {
         self.0 &= rhs.0;
     }
 }
-#[repr(C)]
+#[repr(transparent)]
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct MyDupeEnum(pub u32);
 impl MyOtherDupeEnum {
@@ -75,6 +80,6 @@ impl ::std::ops::BitAndAssign for MyOtherDupeEnum {
         self.0 &= rhs.0;
     }
 }
-#[repr(C)]
+#[repr(transparent)]
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct MyOtherDupeEnum(pub u32);
diff --git a/tests/expectations/tests/issue-1285.rs b/tests/expectations/tests/issue-1285.rs
index 7b2c0ae9d4..666f6175e2 100644
--- a/tests/expectations/tests/issue-1285.rs
+++ b/tests/expectations/tests/issue-1285.rs
@@ -1,12 +1,18 @@
 /* automatically generated by rust-bindgen */
 
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 pub struct foo {
     pub bar: foo__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(4))]
 pub union foo__bindgen_ty_1 {
     pub a: ::std::os::raw::c_uint,
     pub b: ::std::os::raw::c_ushort,
diff --git a/tests/expectations/tests/issue-493.rs b/tests/expectations/tests/issue-493.rs
index c13101d0a9..02ed7ed73d 100644
--- a/tests/expectations/tests/issue-493.rs
+++ b/tests/expectations/tests/issue-493.rs
@@ -1,6 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 pub struct __BindgenUnionField<T>(::std::marker::PhantomData<T>);
@@ -78,6 +83,7 @@ pub struct basic_string___short {
     pub __data_: *mut basic_string_value_type,
 }
 #[repr(C)]
+#[repr(align(1))]
 pub union basic_string___short__bindgen_ty_1 {
     pub __size_: ::std::os::raw::c_uchar,
     pub __lx: basic_string_value_type,
diff --git a/tests/expectations/tests/issue-537.rs b/tests/expectations/tests/issue-537.rs
index 94c6dd3b3f..aaaa9f195e 100644
--- a/tests/expectations/tests/issue-537.rs
+++ b/tests/expectations/tests/issue-537.rs
@@ -39,10 +39,10 @@ fn bindgen_test_layout_AlignedToOne() {
 }
 /// This should be opaque because although we can see the attributes, Rust before
 /// 1.33 doesn't have `#[repr(packed(N))]`.
-#[repr(C)]
+#[repr(C, packed(2))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct AlignedToTwo {
-    pub _bindgen_opaque_blob: [u16; 2usize],
+    pub i: ::std::os::raw::c_int,
 }
 #[test]
 fn bindgen_test_layout_AlignedToTwo() {
@@ -56,6 +56,16 @@ fn bindgen_test_layout_AlignedToTwo() {
         2usize,
         concat!("Alignment of ", stringify!(AlignedToTwo))
     );
+    assert_eq!(
+        unsafe { &(*(::std::ptr::null::<AlignedToTwo>())).i as *const _ as usize },
+        0usize,
+        concat!(
+            "Offset of field: ",
+            stringify!(AlignedToTwo),
+            "::",
+            stringify!(i)
+        )
+    );
 }
 /// This should not be opaque because although `libclang` doesn't give us the
 /// `#pragma pack(1)`, we can detect that alignment is 1 and add
@@ -102,10 +112,11 @@ fn bindgen_test_layout_PackedToOne() {
 /// In this case, even if we can detect the weird alignment triggered by
 /// `#pragma pack(2)`, we can't do anything about it because Rust before 1.33
 /// doesn't have `#[repr(packed(N))]`. Therefore, we must make it opaque.
-#[repr(C)]
+#[repr(C, packed(2))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct PackedToTwo {
-    pub _bindgen_opaque_blob: [u16; 4usize],
+    pub x: ::std::os::raw::c_int,
+    pub y: ::std::os::raw::c_int,
 }
 #[test]
 fn bindgen_test_layout_PackedToTwo() {
@@ -119,4 +130,24 @@ fn bindgen_test_layout_PackedToTwo() {
         2usize,
         concat!("Alignment of ", stringify!(PackedToTwo))
     );
+    assert_eq!(
+        unsafe { &(*(::std::ptr::null::<PackedToTwo>())).x as *const _ as usize },
+        0usize,
+        concat!(
+            "Offset of field: ",
+            stringify!(PackedToTwo),
+            "::",
+            stringify!(x)
+        )
+    );
+    assert_eq!(
+        unsafe { &(*(::std::ptr::null::<PackedToTwo>())).y as *const _ as usize },
+        4usize,
+        concat!(
+            "Offset of field: ",
+            stringify!(PackedToTwo),
+            "::",
+            stringify!(y)
+        )
+    );
 }
diff --git a/tests/expectations/tests/issue-648-derive-debug-with-padding.rs b/tests/expectations/tests/issue-648-derive-debug-with-padding.rs
index ddd8545517..15f0209410 100644
--- a/tests/expectations/tests/issue-648-derive-debug-with-padding.rs
+++ b/tests/expectations/tests/issue-648-derive-debug-with-padding.rs
@@ -12,6 +12,7 @@
 /// up with the reight alignment, we're waiting on `#[repr(align="N")]` to land
 /// in rustc).
 #[repr(C)]
+#[repr(align(64))]
 #[derive(Copy, Clone)]
 pub struct NoDebug {
     pub c: ::std::os::raw::c_char,
@@ -24,6 +25,11 @@ fn bindgen_test_layout_NoDebug() {
         64usize,
         concat!("Size of: ", stringify!(NoDebug))
     );
+    assert_eq!(
+        ::std::mem::align_of::<NoDebug>(),
+        64usize,
+        concat!("Alignment of ", stringify!(NoDebug))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<NoDebug>())).c as *const _ as usize },
         0usize,
@@ -50,6 +56,7 @@ impl ::std::cmp::PartialEq for NoDebug {
 /// we determine Debug derive-ability before we compute padding, which happens at
 /// codegen. (Again, we expect to get the alignment wrong for similar reasons.)
 #[repr(C)]
+#[repr(align(64))]
 #[derive(Copy, Clone)]
 pub struct ShouldDeriveDebugButDoesNot {
     pub c: [::std::os::raw::c_char; 32usize],
@@ -63,6 +70,11 @@ fn bindgen_test_layout_ShouldDeriveDebugButDoesNot() {
         64usize,
         concat!("Size of: ", stringify!(ShouldDeriveDebugButDoesNot))
     );
+    assert_eq!(
+        ::std::mem::align_of::<ShouldDeriveDebugButDoesNot>(),
+        64usize,
+        concat!("Alignment of ", stringify!(ShouldDeriveDebugButDoesNot))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<ShouldDeriveDebugButDoesNot>())).c as *const _ as usize },
         0usize,
diff --git a/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs b/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs
index ce0066560d..ca56ccceb0 100644
--- a/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs
+++ b/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs
@@ -90,10 +90,10 @@ where
     }
 }
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Foo {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 32usize], u64>,
-    pub __bindgen_align: [u64; 0usize],
 }
 #[test]
 fn bindgen_test_layout_Foo() {
diff --git a/tests/expectations/tests/issue-801-opaque-sloppiness.rs b/tests/expectations/tests/issue-801-opaque-sloppiness.rs
index 76deebbaa5..f6356c497d 100644
--- a/tests/expectations/tests/issue-801-opaque-sloppiness.rs
+++ b/tests/expectations/tests/issue-801-opaque-sloppiness.rs
@@ -1,6 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Debug, Copy, Clone)]
@@ -8,6 +13,7 @@ pub struct A {
     _unused: [u8; 0],
 }
 #[repr(C)]
+#[repr(align(1))]
 #[derive(Debug, Default, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct B {
     pub _bindgen_opaque_blob: u8,
diff --git a/tests/expectations/tests/issue-807-opaque-types-methods-being-generated.rs b/tests/expectations/tests/issue-807-opaque-types-methods-being-generated.rs
index 0b1c020d82..798a9f8fab 100644
--- a/tests/expectations/tests/issue-807-opaque-types-methods-being-generated.rs
+++ b/tests/expectations/tests/issue-807-opaque-types-methods-being-generated.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Debug, Default, Copy, Clone, Hash, PartialEq, Eq)]
@@ -59,6 +62,7 @@ fn bindgen_test_layout_SuchWow() {
     );
 }
 #[repr(C)]
+#[repr(align(1))]
 #[derive(Debug, Default, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct Opaque {
     pub _bindgen_opaque_blob: u8,
diff --git a/tests/expectations/tests/issue-816.rs b/tests/expectations/tests/issue-816.rs
index d7be76ce01..b5e30fbedd 100644
--- a/tests/expectations/tests/issue-816.rs
+++ b/tests/expectations/tests/issue-816.rs
@@ -90,10 +90,10 @@ where
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct capabilities {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 16usize], u8>,
-    pub __bindgen_align: [u32; 0usize],
 }
 #[test]
 fn bindgen_test_layout_capabilities() {
diff --git a/tests/expectations/tests/jsval_layout_opaque.rs b/tests/expectations/tests/jsval_layout_opaque.rs
index 00b4301cc2..9ea5e5c015 100644
--- a/tests/expectations/tests/jsval_layout_opaque.rs
+++ b/tests/expectations/tests/jsval_layout_opaque.rs
@@ -176,6 +176,7 @@ pub enum JSWhyMagic {
     JS_WHY_MAGIC_COUNT = 18,
 }
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Copy, Clone)]
 pub union jsval_layout {
     pub asBits: u64,
@@ -188,10 +189,10 @@ pub union jsval_layout {
     _bindgen_union_align: u64,
 }
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct jsval_layout__bindgen_ty_1 {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 8usize], u64>,
-    pub __bindgen_align: [u64; 0usize],
 }
 #[test]
 fn bindgen_test_layout_jsval_layout__bindgen_ty_1() {
@@ -258,6 +259,7 @@ pub struct jsval_layout__bindgen_ty_2 {
     pub payload: jsval_layout__bindgen_ty_2__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union jsval_layout__bindgen_ty_2__bindgen_ty_1 {
     pub i32: i32,
diff --git a/tests/expectations/tests/layout.rs b/tests/expectations/tests/layout.rs
index 2790446c1a..3053122d12 100644
--- a/tests/expectations/tests/layout.rs
+++ b/tests/expectations/tests/layout.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 pub struct header {
diff --git a/tests/expectations/tests/layout_align.rs b/tests/expectations/tests/layout_align.rs
index 39fb294857..e655b9dc8f 100644
--- a/tests/expectations/tests/layout_align.rs
+++ b/tests/expectations/tests/layout_align.rs
@@ -126,6 +126,7 @@ impl<T> ::std::clone::Clone for __IncompleteArrayField<T> {
     }
 }
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Debug)]
 pub struct rte_kni_fifo {
     ///< Next position to be written
@@ -138,7 +139,6 @@ pub struct rte_kni_fifo {
     pub elem_size: ::std::os::raw::c_uint,
     ///< The buffer contains mbuf pointers
     pub buffer: __IncompleteArrayField<*mut ::std::os::raw::c_void>,
-    pub __bindgen_align: [u64; 0usize],
 }
 #[test]
 fn bindgen_test_layout_rte_kni_fifo() {
@@ -159,13 +159,13 @@ impl Default for rte_kni_fifo {
     }
 }
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct rte_eth_link {
     ///< ETH_SPEED_NUM_
     pub link_speed: u32,
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 1usize], u8>,
     pub __bindgen_padding_0: [u8; 3usize],
-    pub __bindgen_align: [u64; 0usize],
 }
 #[test]
 fn bindgen_test_layout_rte_eth_link() {
diff --git a/tests/expectations/tests/layout_array.rs b/tests/expectations/tests/layout_array.rs
index 2fd93c4ae9..0da08871e7 100644
--- a/tests/expectations/tests/layout_array.rs
+++ b/tests/expectations/tests/layout_array.rs
@@ -49,6 +49,7 @@ pub type rte_mempool_get_count =
     ::std::option::Option<unsafe extern "C" fn(mp: *const rte_mempool) -> ::std::os::raw::c_uint>;
 /// Structure defining mempool operations structure
 #[repr(C)]
+#[repr(align(64))]
 #[derive(Copy, Clone)]
 pub struct rte_mempool_ops {
     ///< Name of mempool ops struct.
@@ -72,6 +73,11 @@ fn bindgen_test_layout_rte_mempool_ops() {
         128usize,
         concat!("Size of: ", stringify!(rte_mempool_ops))
     );
+    assert_eq!(
+        ::std::mem::align_of::<rte_mempool_ops>(),
+        64usize,
+        concat!("Alignment of ", stringify!(rte_mempool_ops))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<rte_mempool_ops>())).name as *const _ as usize },
         0usize,
@@ -186,6 +192,7 @@ fn bindgen_test_layout_rte_spinlock_t() {
 /// any function pointers stored directly in the mempool struct would not be.
 /// This results in us simply having "ops_index" in the mempool struct.
 #[repr(C)]
+#[repr(align(64))]
 #[derive(Copy, Clone)]
 pub struct rte_mempool_ops_table {
     ///< Spinlock for add/delete.
@@ -203,6 +210,11 @@ fn bindgen_test_layout_rte_mempool_ops_table() {
         2112usize,
         concat!("Size of: ", stringify!(rte_mempool_ops_table))
     );
+    assert_eq!(
+        ::std::mem::align_of::<rte_mempool_ops_table>(),
+        64usize,
+        concat!("Alignment of ", stringify!(rte_mempool_ops_table))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<rte_mempool_ops_table>())).sl as *const _ as usize },
         0usize,
@@ -241,6 +253,7 @@ impl Default for rte_mempool_ops_table {
 }
 /// Structure to hold malloc heap
 #[repr(C)]
+#[repr(align(64))]
 #[derive(Copy, Clone)]
 pub struct malloc_heap {
     pub lock: rte_spinlock_t,
@@ -290,6 +303,11 @@ fn bindgen_test_layout_malloc_heap() {
         128usize,
         concat!("Size of: ", stringify!(malloc_heap))
     );
+    assert_eq!(
+        ::std::mem::align_of::<malloc_heap>(),
+        64usize,
+        concat!("Alignment of ", stringify!(malloc_heap))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<malloc_heap>())).lock as *const _ as usize },
         0usize,
diff --git a/tests/expectations/tests/layout_array_too_long.rs b/tests/expectations/tests/layout_array_too_long.rs
index 91c74d4bfe..27dd96ff4c 100644
--- a/tests/expectations/tests/layout_array_too_long.rs
+++ b/tests/expectations/tests/layout_array_too_long.rs
@@ -140,6 +140,7 @@ fn bindgen_test_layout_ip_frag_key() {
 /// @internal Fragmented packet to reassemble.
 /// First two entries in the frags[] array are for the last and first fragments.
 #[repr(C)]
+#[repr(align(64))]
 #[derive(Copy, Clone)]
 pub struct ip_frag_pkt {
     ///< LRU list
@@ -213,6 +214,11 @@ fn bindgen_test_layout_ip_frag_pkt() {
         192usize,
         concat!("Size of: ", stringify!(ip_frag_pkt))
     );
+    assert_eq!(
+        ::std::mem::align_of::<ip_frag_pkt>(),
+        64usize,
+        concat!("Alignment of ", stringify!(ip_frag_pkt))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<ip_frag_pkt>())).lru as *const _ as usize },
         0usize,
diff --git a/tests/expectations/tests/layout_eth_conf.rs b/tests/expectations/tests/layout_eth_conf.rs
index 5582c7ded3..734839fc20 100644
--- a/tests/expectations/tests/layout_eth_conf.rs
+++ b/tests/expectations/tests/layout_eth_conf.rs
@@ -1830,6 +1830,7 @@ impl Default for rte_eth_conf__bindgen_ty_1 {
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union rte_eth_conf__bindgen_ty_2 {
     pub vmdq_dcb_tx_conf: rte_eth_vmdq_dcb_tx_conf,
diff --git a/tests/expectations/tests/layout_kni_mbuf.rs b/tests/expectations/tests/layout_kni_mbuf.rs
index cd45688155..fd8047aef9 100644
--- a/tests/expectations/tests/layout_kni_mbuf.rs
+++ b/tests/expectations/tests/layout_kni_mbuf.rs
@@ -10,6 +10,7 @@
 pub const RTE_CACHE_LINE_MIN_SIZE: u32 = 64;
 pub const RTE_CACHE_LINE_SIZE: u32 = 64;
 #[repr(C)]
+#[repr(align(64))]
 #[derive(Copy, Clone)]
 pub struct rte_kni_mbuf {
     pub buf_addr: *mut ::std::os::raw::c_void,
@@ -41,6 +42,11 @@ fn bindgen_test_layout_rte_kni_mbuf() {
         128usize,
         concat!("Size of: ", stringify!(rte_kni_mbuf))
     );
+    assert_eq!(
+        ::std::mem::align_of::<rte_kni_mbuf>(),
+        64usize,
+        concat!("Alignment of ", stringify!(rte_kni_mbuf))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<rte_kni_mbuf>())).buf_addr as *const _ as usize },
         0usize,
diff --git a/tests/expectations/tests/layout_large_align_field.rs b/tests/expectations/tests/layout_large_align_field.rs
index 8b7be4ca5f..4c10223c6c 100644
--- a/tests/expectations/tests/layout_large_align_field.rs
+++ b/tests/expectations/tests/layout_large_align_field.rs
@@ -176,6 +176,7 @@ fn bindgen_test_layout_ip_frag_key() {
 /// @internal Fragmented packet to reassemble.
 /// First two entries in the frags[] array are for the last and first fragments.
 #[repr(C)]
+#[repr(align(64))]
 #[derive(Copy, Clone)]
 pub struct ip_frag_pkt {
     ///< LRU list
@@ -249,6 +250,11 @@ fn bindgen_test_layout_ip_frag_pkt() {
         192usize,
         concat!("Size of: ", stringify!(ip_frag_pkt))
     );
+    assert_eq!(
+        ::std::mem::align_of::<ip_frag_pkt>(),
+        64usize,
+        concat!("Alignment of ", stringify!(ip_frag_pkt))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<ip_frag_pkt>())).lru as *const _ as usize },
         0usize,
@@ -371,6 +377,7 @@ impl Default for ip_pkt_list {
 }
 /// fragmentation table statistics
 #[repr(C)]
+#[repr(align(64))]
 #[derive(Copy, Clone)]
 pub struct ip_frag_tbl_stat {
     ///< total # of find/insert attempts.
@@ -394,6 +401,11 @@ fn bindgen_test_layout_ip_frag_tbl_stat() {
         64usize,
         concat!("Size of: ", stringify!(ip_frag_tbl_stat))
     );
+    assert_eq!(
+        ::std::mem::align_of::<ip_frag_tbl_stat>(),
+        64usize,
+        concat!("Alignment of ", stringify!(ip_frag_tbl_stat))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<ip_frag_tbl_stat>())).find_num as *const _ as usize },
         0usize,
@@ -462,6 +474,7 @@ impl Default for ip_frag_tbl_stat {
 }
 /// fragmentation table
 #[repr(C)]
+#[repr(align(64))]
 pub struct rte_ip_frag_tbl {
     ///< ttl for table entries.
     pub max_cycles: u64,
@@ -494,6 +507,11 @@ fn bindgen_test_layout_rte_ip_frag_tbl() {
         128usize,
         concat!("Size of: ", stringify!(rte_ip_frag_tbl))
     );
+    assert_eq!(
+        ::std::mem::align_of::<rte_ip_frag_tbl>(),
+        64usize,
+        concat!("Alignment of ", stringify!(rte_ip_frag_tbl))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<rte_ip_frag_tbl>())).max_cycles as *const _ as usize },
         0usize,
diff --git a/tests/expectations/tests/layout_mbuf.rs b/tests/expectations/tests/layout_mbuf.rs
index 83dfb94655..8bfda72d0c 100644
--- a/tests/expectations/tests/layout_mbuf.rs
+++ b/tests/expectations/tests/layout_mbuf.rs
@@ -127,6 +127,7 @@ fn bindgen_test_layout_rte_atomic16_t() {
 }
 /// The generic rte_mbuf, containing a packet mbuf.
 #[repr(C)]
+#[repr(align(64))]
 pub struct rte_mbuf {
     pub cacheline0: MARKER,
     ///< Virtual address of segment buffer.
@@ -179,6 +180,7 @@ pub struct rte_mbuf {
 /// or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
 /// config option.
 #[repr(C)]
+#[repr(align(2))]
 #[derive(Copy, Clone)]
 pub union rte_mbuf__bindgen_ty_1 {
     ///< Atomically accessed refcnt
@@ -228,6 +230,7 @@ impl Default for rte_mbuf__bindgen_ty_1 {
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union rte_mbuf__bindgen_ty_2 {
     ///< L2/L3/L4 and tunnel information.
@@ -236,10 +239,10 @@ pub union rte_mbuf__bindgen_ty_2 {
     _bindgen_union_align: u32,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct rte_mbuf__bindgen_ty_2__bindgen_ty_1 {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 4usize], u8>,
-    pub __bindgen_align: [u32; 0usize],
 }
 #[test]
 fn bindgen_test_layout_rte_mbuf__bindgen_ty_2__bindgen_ty_1() {
@@ -412,6 +415,7 @@ impl Default for rte_mbuf__bindgen_ty_2 {
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union rte_mbuf__bindgen_ty_3 {
     ///< RSS hash result if RSS enabled
@@ -431,6 +435,7 @@ pub struct rte_mbuf__bindgen_ty_3__bindgen_ty_1 {
     pub hi: u32,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union rte_mbuf__bindgen_ty_3__bindgen_ty_1__bindgen_ty_1 {
     pub __bindgen_anon_1: rte_mbuf__bindgen_ty_3__bindgen_ty_1__bindgen_ty_1__bindgen_ty_1,
@@ -667,6 +672,7 @@ impl Default for rte_mbuf__bindgen_ty_3 {
     }
 }
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Copy, Clone)]
 pub union rte_mbuf__bindgen_ty_4 {
     ///< Can be used for external metadata
@@ -714,6 +720,7 @@ impl Default for rte_mbuf__bindgen_ty_4 {
     }
 }
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Copy, Clone)]
 pub union rte_mbuf__bindgen_ty_5 {
     ///< combined for easy fetch
@@ -722,10 +729,10 @@ pub union rte_mbuf__bindgen_ty_5 {
     _bindgen_union_align: u64,
 }
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Debug, Default, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct rte_mbuf__bindgen_ty_5__bindgen_ty_1 {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 8usize], u16>,
-    pub __bindgen_align: [u64; 0usize],
 }
 #[test]
 fn bindgen_test_layout_rte_mbuf__bindgen_ty_5__bindgen_ty_1() {
@@ -888,6 +895,11 @@ fn bindgen_test_layout_rte_mbuf() {
         128usize,
         concat!("Size of: ", stringify!(rte_mbuf))
     );
+    assert_eq!(
+        ::std::mem::align_of::<rte_mbuf>(),
+        64usize,
+        concat!("Alignment of ", stringify!(rte_mbuf))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<rte_mbuf>())).cacheline0 as *const _ as usize },
         0usize,
diff --git a/tests/expectations/tests/libclang-3.8/error-E0600-cannot-apply-unary-negation-to-u32.rs b/tests/expectations/tests/libclang-3.8/error-E0600-cannot-apply-unary-negation-to-u32.rs
index 68eab7a2d3..04833a6581 100644
--- a/tests/expectations/tests/libclang-3.8/error-E0600-cannot-apply-unary-negation-to-u32.rs
+++ b/tests/expectations/tests/libclang-3.8/error-E0600-cannot-apply-unary-negation-to-u32.rs
@@ -6,5 +6,6 @@
     non_camel_case_types,
     non_upper_case_globals
 )]
+#![allow(overflowing_literals)]
 
 pub const a: u32 = 18446744073709551611;
diff --git a/tests/expectations/tests/libclang-3.9/error-E0600-cannot-apply-unary-negation-to-u32.rs b/tests/expectations/tests/libclang-3.9/error-E0600-cannot-apply-unary-negation-to-u32.rs
index 68eab7a2d3..04833a6581 100644
--- a/tests/expectations/tests/libclang-3.9/error-E0600-cannot-apply-unary-negation-to-u32.rs
+++ b/tests/expectations/tests/libclang-3.9/error-E0600-cannot-apply-unary-negation-to-u32.rs
@@ -6,5 +6,6 @@
     non_camel_case_types,
     non_upper_case_globals
 )]
+#![allow(overflowing_literals)]
 
 pub const a: u32 = 18446744073709551611;
diff --git a/tests/expectations/tests/libclang-4/error-E0600-cannot-apply-unary-negation-to-u32.rs b/tests/expectations/tests/libclang-4/error-E0600-cannot-apply-unary-negation-to-u32.rs
index 7ad2fc1c7d..ce5d0362d6 100644
--- a/tests/expectations/tests/libclang-4/error-E0600-cannot-apply-unary-negation-to-u32.rs
+++ b/tests/expectations/tests/libclang-4/error-E0600-cannot-apply-unary-negation-to-u32.rs
@@ -6,5 +6,6 @@
     non_camel_case_types,
     non_upper_case_globals
 )]
+#![allow(overflowing_literals)]
 
 pub const a: u32 = 4294967291;
diff --git a/tests/expectations/tests/libclang-5/call-conv-field.rs b/tests/expectations/tests/libclang-5/call-conv-field.rs
index 295a23f9ac..e167e5ebd2 100644
--- a/tests/expectations/tests/libclang-5/call-conv-field.rs
+++ b/tests/expectations/tests/libclang-5/call-conv-field.rs
@@ -1,6 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 #![cfg(not(test))]
 
 #[repr(C)]
@@ -19,6 +24,11 @@ fn bindgen_test_layout_JNINativeInterface_() {
         16usize,
         concat!("Size of: ", stringify!(JNINativeInterface_))
     );
+    assert_eq!(
+        ::std::mem::align_of::<JNINativeInterface_>(),
+        8usize,
+        concat!("Alignment of ", stringify!(JNINativeInterface_))
+    );
     assert_eq!(
         unsafe { &(*(::std::ptr::null::<JNINativeInterface_>())).GetVersion as *const _ as usize },
         0usize,
diff --git a/tests/expectations/tests/libclang-5/error-E0600-cannot-apply-unary-negation-to-u32.rs b/tests/expectations/tests/libclang-5/error-E0600-cannot-apply-unary-negation-to-u32.rs
index 7ad2fc1c7d..ce5d0362d6 100644
--- a/tests/expectations/tests/libclang-5/error-E0600-cannot-apply-unary-negation-to-u32.rs
+++ b/tests/expectations/tests/libclang-5/error-E0600-cannot-apply-unary-negation-to-u32.rs
@@ -6,5 +6,6 @@
     non_camel_case_types,
     non_upper_case_globals
 )]
+#![allow(overflowing_literals)]
 
 pub const a: u32 = 4294967291;
diff --git a/tests/expectations/tests/no-hash-opaque.rs b/tests/expectations/tests/no-hash-opaque.rs
index c4211c71b1..427a3d3424 100644
--- a/tests/expectations/tests/no-hash-opaque.rs
+++ b/tests/expectations/tests/no-hash-opaque.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct NoHash {
     pub _bindgen_opaque_blob: u32,
diff --git a/tests/expectations/tests/no-partialeq-opaque.rs b/tests/expectations/tests/no-partialeq-opaque.rs
index 1a7941623d..5bf2d12180 100644
--- a/tests/expectations/tests/no-partialeq-opaque.rs
+++ b/tests/expectations/tests/no-partialeq-opaque.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct NoPartialEq {
     pub _bindgen_opaque_blob: u32,
diff --git a/tests/expectations/tests/no_copy_opaque.rs b/tests/expectations/tests/no_copy_opaque.rs
index 8de90cd4ec..6659a95a99 100644
--- a/tests/expectations/tests/no_copy_opaque.rs
+++ b/tests/expectations/tests/no_copy_opaque.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default)]
 pub struct NoCopy {
     pub _bindgen_opaque_blob: u32,
diff --git a/tests/expectations/tests/opaque-tracing.rs b/tests/expectations/tests/opaque-tracing.rs
index 87d91f3c4e..6bba62456e 100644
--- a/tests/expectations/tests/opaque-tracing.rs
+++ b/tests/expectations/tests/opaque-tracing.rs
@@ -1,14 +1,18 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 extern "C" {
     #[link_name = "\u{1}_Z3fooP9Container"]
     pub fn foo(c: *mut Container);
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct Container {
     pub _bindgen_opaque_blob: [u32; 2usize],
diff --git a/tests/expectations/tests/opaque_in_struct.rs b/tests/expectations/tests/opaque_in_struct.rs
index 590c5fdcad..9301f7ab86 100644
--- a/tests/expectations/tests/opaque_in_struct.rs
+++ b/tests/expectations/tests/opaque_in_struct.rs
@@ -9,6 +9,7 @@
 
 /// <div rustbindgen opaque>
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct opaque {
     pub _bindgen_opaque_blob: u32,
diff --git a/tests/expectations/tests/opaque_pointer.rs b/tests/expectations/tests/opaque_pointer.rs
index c44a244046..3ec962144f 100644
--- a/tests/expectations/tests/opaque_pointer.rs
+++ b/tests/expectations/tests/opaque_pointer.rs
@@ -9,6 +9,7 @@
 
 /// <div rustbindgen opaque></div>
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct OtherOpaque {
     pub _bindgen_opaque_blob: u32,
diff --git a/tests/expectations/tests/struct_with_anon_union.rs b/tests/expectations/tests/struct_with_anon_union.rs
index f7ddb3584d..2279853f42 100644
--- a/tests/expectations/tests/struct_with_anon_union.rs
+++ b/tests/expectations/tests/struct_with_anon_union.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Copy, Clone)]
@@ -10,6 +13,7 @@ pub struct foo {
     pub bar: foo__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union foo__bindgen_ty_1 {
     pub a: ::std::os::raw::c_uint,
diff --git a/tests/expectations/tests/struct_with_anon_unnamed_union.rs b/tests/expectations/tests/struct_with_anon_unnamed_union.rs
index 378900198d..90ee13e49e 100644
--- a/tests/expectations/tests/struct_with_anon_unnamed_union.rs
+++ b/tests/expectations/tests/struct_with_anon_unnamed_union.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Copy, Clone)]
@@ -10,6 +13,7 @@ pub struct foo {
     pub __bindgen_anon_1: foo__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union foo__bindgen_ty_1 {
     pub a: ::std::os::raw::c_uint,
diff --git a/tests/expectations/tests/struct_with_nesting.rs b/tests/expectations/tests/struct_with_nesting.rs
index f56c44a5f8..ddbbe77822 100644
--- a/tests/expectations/tests/struct_with_nesting.rs
+++ b/tests/expectations/tests/struct_with_nesting.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Copy, Clone)]
@@ -11,6 +14,7 @@ pub struct foo {
     pub __bindgen_anon_1: foo__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union foo__bindgen_ty_1 {
     pub b: ::std::os::raw::c_uint,
diff --git a/tests/expectations/tests/typeref.rs b/tests/expectations/tests/typeref.rs
index d533b9fb00..b0f1290d9f 100644
--- a/tests/expectations/tests/typeref.rs
+++ b/tests/expectations/tests/typeref.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Debug, Default, Copy, Clone, Hash, PartialEq, Eq)]
@@ -57,6 +60,7 @@ pub struct mozilla_StyleShapeSource {
     pub __bindgen_anon_1: mozilla_StyleShapeSource__bindgen_ty_1,
 }
 #[repr(C)]
+#[repr(align(8))]
 pub union mozilla_StyleShapeSource__bindgen_ty_1 {
     pub mPosition: *mut mozilla_Position,
     pub mFragmentOrURL: *mut mozilla_FragmentOrURL,
diff --git a/tests/expectations/tests/union-in-ns.rs b/tests/expectations/tests/union-in-ns.rs
index ee4ac07c45..c3b541a2de 100644
--- a/tests/expectations/tests/union-in-ns.rs
+++ b/tests/expectations/tests/union-in-ns.rs
@@ -1,14 +1,18 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[allow(non_snake_case, non_camel_case_types, non_upper_case_globals)]
 pub mod root {
     #[allow(unused_imports)]
     use self::super::root;
     #[repr(C)]
+    #[repr(align(4))]
     #[derive(Copy, Clone)]
     pub union bar {
         pub baz: ::std::os::raw::c_int,
diff --git a/tests/expectations/tests/union_bitfield.rs b/tests/expectations/tests/union_bitfield.rs
index d6f52ef5d0..d3a94b1090 100644
--- a/tests/expectations/tests/union_bitfield.rs
+++ b/tests/expectations/tests/union_bitfield.rs
@@ -90,6 +90,7 @@ where
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union U4 {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 1usize], u8>,
@@ -137,6 +138,7 @@ impl U4 {
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union B {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 4usize], u32>,
diff --git a/tests/expectations/tests/union_dtor.rs b/tests/expectations/tests/union_dtor.rs
index 69359e64f7..ee6e4e22e1 100644
--- a/tests/expectations/tests/union_dtor.rs
+++ b/tests/expectations/tests/union_dtor.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(8))]
 pub union UnionWithDtor {
     pub mFoo: ::std::os::raw::c_int,
     pub mBar: *mut ::std::os::raw::c_void,
diff --git a/tests/expectations/tests/union_fields.rs b/tests/expectations/tests/union_fields.rs
index 38657d05a2..40e374cfa7 100644
--- a/tests/expectations/tests/union_fields.rs
+++ b/tests/expectations/tests/union_fields.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Copy, Clone)]
 pub union nsStyleUnion {
     pub mInt: ::std::os::raw::c_int,
diff --git a/tests/expectations/tests/union_template.rs b/tests/expectations/tests/union_template.rs
index 515d568867..eea3b0e525 100644
--- a/tests/expectations/tests/union_template.rs
+++ b/tests/expectations/tests/union_template.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 pub struct NastyStruct {
@@ -11,6 +14,7 @@ pub struct NastyStruct {
     pub __bindgen_anon_1: NastyStruct__bindgen_ty_2,
 }
 #[repr(C)]
+#[repr(align(8))]
 pub union NastyStruct__bindgen_ty_1 {
     pub mFoo: *mut ::std::os::raw::c_void,
     pub mDummy: ::std::os::raw::c_ulong,
@@ -22,6 +26,7 @@ impl Default for NastyStruct__bindgen_ty_1 {
     }
 }
 #[repr(C)]
+#[repr(align(8))]
 pub union NastyStruct__bindgen_ty_2 {
     pub wat: ::std::os::raw::c_short,
     pub wut: *mut ::std::os::raw::c_int,
@@ -38,6 +43,7 @@ impl Default for NastyStruct {
     }
 }
 #[repr(C)]
+#[repr(align(8))]
 pub union Whatever {
     pub mTPtr: *mut ::std::os::raw::c_void,
     pub mInt: ::std::os::raw::c_int,
diff --git a/tests/expectations/tests/union_with_anon_struct.rs b/tests/expectations/tests/union_with_anon_struct.rs
index dbffb17c81..ede6acf041 100644
--- a/tests/expectations/tests/union_with_anon_struct.rs
+++ b/tests/expectations/tests/union_with_anon_struct.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union foo {
     pub bar: foo__bindgen_ty_1,
diff --git a/tests/expectations/tests/union_with_anon_struct_bitfield.rs b/tests/expectations/tests/union_with_anon_struct_bitfield.rs
index e41fc9735b..d08a7ff8e6 100644
--- a/tests/expectations/tests/union_with_anon_struct_bitfield.rs
+++ b/tests/expectations/tests/union_with_anon_struct_bitfield.rs
@@ -90,6 +90,7 @@ where
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union foo {
     pub a: ::std::os::raw::c_int,
@@ -97,10 +98,10 @@ pub union foo {
     _bindgen_union_align: u32,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct foo__bindgen_ty_1 {
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 4usize], u32>,
-    pub __bindgen_align: [u32; 0usize],
 }
 #[test]
 fn bindgen_test_layout_foo__bindgen_ty_1() {
diff --git a/tests/expectations/tests/union_with_anon_union.rs b/tests/expectations/tests/union_with_anon_union.rs
index 43581d8b91..df1b34f870 100644
--- a/tests/expectations/tests/union_with_anon_union.rs
+++ b/tests/expectations/tests/union_with_anon_union.rs
@@ -1,16 +1,21 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union foo {
     pub bar: foo__bindgen_ty_1,
     _bindgen_union_align: u32,
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union foo__bindgen_ty_1 {
     pub a: ::std::os::raw::c_uint,
diff --git a/tests/expectations/tests/union_with_anon_unnamed_struct.rs b/tests/expectations/tests/union_with_anon_unnamed_struct.rs
index 738aade3b3..79f6624b7a 100644
--- a/tests/expectations/tests/union_with_anon_unnamed_struct.rs
+++ b/tests/expectations/tests/union_with_anon_unnamed_struct.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union pixel {
     pub rgba: ::std::os::raw::c_uint,
diff --git a/tests/expectations/tests/union_with_anon_unnamed_union.rs b/tests/expectations/tests/union_with_anon_unnamed_union.rs
index 35c9028570..c81afa1fd0 100644
--- a/tests/expectations/tests/union_with_anon_unnamed_union.rs
+++ b/tests/expectations/tests/union_with_anon_unnamed_union.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union foo {
     pub a: ::std::os::raw::c_uint,
@@ -12,6 +16,7 @@ pub union foo {
     _bindgen_union_align: u32,
 }
 #[repr(C)]
+#[repr(align(2))]
 #[derive(Copy, Clone)]
 pub union foo__bindgen_ty_1 {
     pub b: ::std::os::raw::c_ushort,
diff --git a/tests/expectations/tests/union_with_big_member.rs b/tests/expectations/tests/union_with_big_member.rs
index 64ce4d0feb..40eed80b71 100644
--- a/tests/expectations/tests/union_with_big_member.rs
+++ b/tests/expectations/tests/union_with_big_member.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union WithBigArray {
     pub a: ::std::os::raw::c_int,
@@ -50,6 +54,7 @@ impl Default for WithBigArray {
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union WithBigArray2 {
     pub a: ::std::os::raw::c_int,
@@ -95,6 +100,7 @@ impl Default for WithBigArray2 {
     }
 }
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union WithBigMember {
     pub a: ::std::os::raw::c_int,
diff --git a/tests/expectations/tests/union_with_nesting.rs b/tests/expectations/tests/union_with_nesting.rs
index 631005f81e..e11aff2eee 100644
--- a/tests/expectations/tests/union_with_nesting.rs
+++ b/tests/expectations/tests/union_with_nesting.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union foo {
     pub a: ::std::os::raw::c_uint,
@@ -18,6 +22,7 @@ pub struct foo__bindgen_ty_1 {
     pub __bindgen_anon_2: foo__bindgen_ty_1__bindgen_ty_2,
 }
 #[repr(C)]
+#[repr(align(2))]
 #[derive(Copy, Clone)]
 pub union foo__bindgen_ty_1__bindgen_ty_1 {
     pub b1: ::std::os::raw::c_ushort,
@@ -67,6 +72,7 @@ impl Default for foo__bindgen_ty_1__bindgen_ty_1 {
     }
 }
 #[repr(C)]
+#[repr(align(2))]
 #[derive(Copy, Clone)]
 pub union foo__bindgen_ty_1__bindgen_ty_2 {
     pub c1: ::std::os::raw::c_ushort,
diff --git a/tests/expectations/tests/unknown_attr.rs b/tests/expectations/tests/unknown_attr.rs
index 5040465f88..a11f105a3a 100644
--- a/tests/expectations/tests/unknown_attr.rs
+++ b/tests/expectations/tests/unknown_attr.rs
@@ -1,10 +1,14 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
+#[repr(align(16))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct max_align_t {
     pub __clang_max_align_nonce1: ::std::os::raw::c_longlong,
@@ -19,6 +23,11 @@ fn bindgen_test_layout_max_align_t() {
         32usize,
         concat!("Size of: ", stringify!(max_align_t))
     );
+    assert_eq!(
+        ::std::mem::align_of::<max_align_t>(),
+        16usize,
+        concat!("Alignment of ", stringify!(max_align_t))
+    );
     assert_eq!(
         unsafe {
             &(*(::std::ptr::null::<max_align_t>())).__clang_max_align_nonce1 as *const _ as usize
diff --git a/tests/expectations/tests/use-core.rs b/tests/expectations/tests/use-core.rs
index d4e53ef16e..133065e04c 100644
--- a/tests/expectations/tests/use-core.rs
+++ b/tests/expectations/tests/use-core.rs
@@ -1,7 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 extern crate core;
 
@@ -46,6 +50,7 @@ impl Default for foo {
     }
 }
 #[repr(C)]
+#[repr(align(8))]
 #[derive(Copy, Clone)]
 pub union _bindgen_ty_1 {
     pub bar: ::std::os::raw::c_int,
diff --git a/tests/headers/error-E0600-cannot-apply-unary-negation-to-u32.h b/tests/headers/error-E0600-cannot-apply-unary-negation-to-u32.h
index c9189952bb..4c342c0ec5 100644
--- a/tests/headers/error-E0600-cannot-apply-unary-negation-to-u32.h
+++ b/tests/headers/error-E0600-cannot-apply-unary-negation-to-u32.h
@@ -1,3 +1,5 @@
+// bindgen-flags: --raw-line "#![allow(overflowing_literals)]"
+
 typedef unsigned int uint32_t;
 
 uint32_t a = 18446744073709551611;
diff --git a/tests/headers/layout.h b/tests/headers/layout.h
index d1822a04de..b290ee856b 100644
--- a/tests/headers/layout.h
+++ b/tests/headers/layout.h
@@ -1,6 +1,10 @@
+// bindgen-flags: --rust-target 1.21
+//
+// FIXME: https://github.com/rust-lang/rust-bindgen/issues/1498
+
 struct header
 {
     char proto;
     unsigned int size __attribute__ ((packed));
     unsigned char data[] __attribute__ ((aligned(8)));
-} __attribute__ ((aligned, packed));
\ No newline at end of file
+} __attribute__ ((aligned, packed));