Repository: rust-lang/rust-bindgen (rust)

Issue:
`_Float16 _Complex` leads to panic (such as when including `immintrin.h` on clang 16)
<!-- Thanks for filing a bindgen issue! We appreciate it :-) -->

### Input C/C++ Header

```C++
/* input.h */
_Float16 _Complex h;
```

### Bindgen Invocation

<!-- Place either the `bindgen::Builder` or the command line flags used here. -->

```
$ bindgen input.h
```

### Actual Results

```
panicked at 'Non floating-type complex? Type(_Complex _Float16, kind: Complex, cconv: 100, decl: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None), canon: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None)), Type(_Float16, kind: Float16, cconv: 100, decl: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None), canon: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None))', J:\Compilers\Rust\.cargo\registry\src\github.com-1ecc6299db9ec823\bindgen-0.65.1\ir\context.rs:1994:26
```

### Expected Results

Command completes without error.

<!--
Replace this with a description of what you expected instead of the actual
results. The more precise, the better! For example, if a struct in the generated
bindings is missing a field that exists in the C/C++ struct, note that here.
-->


### Synopsis

Ran into this when using a header from a project that includes `immintrin.h`, which on clang 16 always seems to include `avx512fp16intrin.h` and `avx512vlfp16intrin.h`, which in turn have construct `_Float16 _Complex`, which currently bindgen cannot handle.

For example, running bindgen on SDL2's `SDL.h` which includes `immintrin.h` through `SDL_cpuinfo.h` results in the above error.


Pull request description:
Support float16
This is done by defining `pub struct __BindgenFloat16(pub u16);`. Clang has half (`__fp16`; storage type, casted to float for calculations) and float16 (`__Float16`) types, both have same binary representations, and this PR handles both as same.
More about half types here: https://clang.llvm.org/docs/LanguageExtensions.html#half-precision-floating-point.

When rust implements `f16` we could use those if appropriate target rust is used.
Rust `f16` RFC: https://github.com/rust-lang/rfcs/blob/master/text/3453-f16-and-f128.md#f16-type (contains some clang details)

Fixes #2500.

Patch:
diff --git a/.github/workflows/bindgen.yml b/.github/workflows/bindgen.yml
index c7c37bbc..3f85cd86 100644
--- a/.github/workflows/bindgen.yml
+++ b/.github/workflows/bindgen.yml
@@ -238,7 +238,7 @@ jobs:
           override: true
       
       - name: Check cfg
-        run: cargo check -Z unstable-options -Z check-cfg=features
+        run: cargo check -Z unstable-options -Z check-cfg
 
   test-book:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
new file mode 100644
index 00000000..f79ce103
--- /dev/null
+++ b/.github/workflows/publish.yml
@@ -0,0 +1,21 @@
+# To trigger this:
+# - go to Actions > Publish
+# - click the Run Workflow dropdown in the top-right
+name: Publish
+on: workflow_dispatch
+env:
+  CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+jobs:
+  cargo-publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+      - name: Install stable toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+      - name: Publish bindgen (lib)
+        run: cargo publish --package bindgen --token ${CARGO_REGISTRY_TOKEN}
+      - name: Publish bindgen-cli
+        run: cargo publish --package bindgen-cli --token ${CARGO_REGISTRY_TOKEN}
diff --git a/.github/workflows/sync-master-from-main.yml b/.github/workflows/sync-master-from-main.yml
deleted file mode 100644
index 56142450..00000000
--- a/.github/workflows/sync-master-from-main.yml
+++ /dev/null
@@ -1,21 +0,0 @@
-name: sync master from main
-
-on:
-  push:
-    branches:
-      - main
-
-jobs:
-  sync-branches:
-    runs-on: ubuntu-latest
-    name: Keep master and main in sync until master is done
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-      - name: Merge master <- main
-        uses: devmasx/merge-branch@master
-        with:
-          type: now
-          from_branch: main
-          target_branch: master
-          github_token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.gitignore b/.gitignore
index a924030c..a610640e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,8 @@ csmith-fuzzing/platform.info
 
 # Backups of test cases from C-Reduce
 **/*.orig
+
+# node.js files
+node_modules
+package-lock.json
+package.json
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9149d45d..e3f2c9e9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,175 +7,195 @@
   - [Removed](#removed)
   - [Fixed](#fixed)
   - [Security](#security)
-- [0.68.1](#0681)
+- [0.69.1 (2023-11-02)](#0691-2023-11-02)
   - [Fixed](#fixed-1)
-- [0.68.0](#0680)
+- [0.69.0 (2023-11-01)](#0690-2023-11-01)
   - [Added](#added-1)
   - [Changed](#changed-1)
   - [Removed](#removed-1)
   - [Fixed](#fixed-2)
-- [0.67.0](#0670)
-- [0.66.1](#0661)
-  - [Removed](#removed-2)
-- [0.66.0](#0660)
+  - [Security](#security-1)
+- [0.68.1](#0681)
+  - [Fixed](#fixed-3)
+- [0.68.0](#0680)
   - [Added](#added-2)
   - [Changed](#changed-2)
+  - [Removed](#removed-2)
+  - [Fixed](#fixed-4)
+- [0.67.0](#0670)
+- [0.66.1](#0661)
   - [Removed](#removed-3)
-- [0.65.1](#0651)
-  - [Fixed](#fixed-3)
-- [0.65.0](#0650)
+- [0.66.0](#0660)
   - [Added](#added-3)
   - [Changed](#changed-3)
   - [Removed](#removed-4)
-- [0.64.0](#0640)
+- [0.65.1](#0651)
+  - [Fixed](#fixed-5)
+- [0.65.0](#0650)
   - [Added](#added-4)
   - [Changed](#changed-4)
-- [0.63.0](#0630)
+  - [Removed](#removed-5)
+- [0.64.0](#0640)
   - [Added](#added-5)
   - [Changed](#changed-5)
-  - [Removed](#removed-5)
-- [0.62.0](#0620)
+- [0.63.0](#0630)
   - [Added](#added-6)
   - [Changed](#changed-6)
-  - [Fixed](#fixed-4)
-- [0.61.0](#0610)
+  - [Removed](#removed-6)
+- [0.62.0](#0620)
   - [Added](#added-7)
   - [Changed](#changed-7)
-  - [Fixed](#fixed-5)
-- [0.60.1](#0601)
   - [Fixed](#fixed-6)
-- [0.60.0](#0600)
+- [0.61.0](#0610)
   - [Added](#added-8)
-  - [Fixed](#fixed-7)
   - [Changed](#changed-8)
-  - [Removed](#removed-6)
-- [0.59.2](#0592)
-- [0.59.1](#0591)
+  - [Fixed](#fixed-7)
+- [0.60.1](#0601)
   - [Fixed](#fixed-8)
-- [0.59.0](#0590)
+- [0.60.0](#0600)
   - [Added](#added-9)
   - [Fixed](#fixed-9)
   - [Changed](#changed-9)
-- [0.58.1](#0581)
-  - [Added](#added-10)
-- [0.58.0](#0580)
-  - [Added](#added-11)
-  - [Fixed](#fixed-10)
-  - [Changed](#changed-10)
-  - [Deprecated](#deprecated)
   - [Removed](#removed-7)
+- [0.59.2](#0592)
+- [0.59.1](#0591)
+  - [Fixed](#fixed-10)
+- [0.59.0](#0590)
+  - [Added](#added-10)
   - [Fixed](#fixed-11)
-  - [Security](#security-1)
-- [0.57.0](#0570)
+  - [Changed](#changed-10)
+- [0.58.1](#0581)
+  - [Added](#added-11)
+- [0.58.0](#0580)
   - [Added](#added-12)
   - [Fixed](#fixed-12)
-- [0.56.0](#0560)
-  - [Added](#added-13)
   - [Changed](#changed-11)
+  - [Deprecated](#deprecated)
+  - [Removed](#removed-8)
   - [Fixed](#fixed-13)
-- [0.55.1](#0551)
+  - [Security](#security-2)
+- [0.57.0](#0570)
+  - [Added](#added-13)
   - [Fixed](#fixed-14)
-- [0.55.0](#0550)
-  - [Removed](#removed-8)
+- [0.56.0](#0560)
   - [Added](#added-14)
   - [Changed](#changed-12)
   - [Fixed](#fixed-15)
-- [0.54.1](#0541)
+- [0.55.1](#0551)
+  - [Fixed](#fixed-16)
+- [0.55.0](#0550)
+  - [Removed](#removed-9)
   - [Added](#added-15)
   - [Changed](#changed-13)
-  - [Fixed](#fixed-16)
-- [0.54.0](#0540)
+  - [Fixed](#fixed-17)
+- [0.54.1](#0541)
   - [Added](#added-16)
   - [Changed](#changed-14)
-  - [Fixed](#fixed-17)
-- [0.53.3](#0533)
-  - [Added](#added-17)
   - [Fixed](#fixed-18)
-- [0.53.2](#0532)
+- [0.54.0](#0540)
+  - [Added](#added-17)
   - [Changed](#changed-15)
-- [0.53.1](#0531)
+  - [Fixed](#fixed-19)
+- [0.53.3](#0533)
   - [Added](#added-18)
-- [0.53.0](#0530)
-  - [Added](#added-19)
+  - [Fixed](#fixed-20)
+- [0.53.2](#0532)
   - [Changed](#changed-16)
-  - [Fixed](#fixed-19)
-- [0.52.0](#0520)
+- [0.53.1](#0531)
+  - [Added](#added-19)
+- [0.53.0](#0530)
   - [Added](#added-20)
   - [Changed](#changed-17)
-  - [Fixed](#fixed-20)
-- [0.51.1](#0511)
   - [Fixed](#fixed-21)
+- [0.52.0](#0520)
+  - [Added](#added-21)
   - [Changed](#changed-18)
-- [0.51.0](#0510)
   - [Fixed](#fixed-22)
+- [0.51.1](#0511)
+  - [Fixed](#fixed-23)
   - [Changed](#changed-19)
-  - [Added](#added-21)
-- [0.50.0](#0500)
+- [0.51.0](#0510)
+  - [Fixed](#fixed-24)
+  - [Changed](#changed-20)
   - [Added](#added-22)
-- [0.49.3](#0493)
+- [0.50.0](#0500)
   - [Added](#added-23)
+- [0.49.3](#0493)
+  - [Added](#added-24)
 - [0.49.2](#0492)
-  - [Changed](#changed-20)
-- [0.49.1](#0491)
-  - [Fixed](#fixed-23)
   - [Changed](#changed-21)
-- [0.49.0](#0490)
-  - [Added](#added-24)
-  - [Fixed](#fixed-24)
+- [0.49.1](#0491)
+  - [Fixed](#fixed-25)
   - [Changed](#changed-22)
+- [0.49.0](#0490)
+  - [Added](#added-25)
+  - [Fixed](#fixed-26)
+  - [Changed](#changed-23)
 - [0.48.1](#0481)
-  - [Fixed](#fixed-25)
+  - [Fixed](#fixed-27)
 - [0.48.0](#0480)
-  - [Changed](#changed-23)
-  - [Fixed](#fixed-26)
+  - [Changed](#changed-24)
+  - [Fixed](#fixed-28)
 - [0.47.4](#0474)
-  - [Added](#added-25)
+  - [Added](#added-26)
 - [0.47.3](#0473)
-  - [Changed](#changed-24)
+  - [Changed](#changed-25)
 - [0.47.2](#0472)
-  - [Fixed](#fixed-27)
+  - [Fixed](#fixed-29)
 - [0.47.1](#0471)
-  - [Changed](#changed-25)
-  - [Fixed](#fixed-28)
-- [0.47.0](#0470)
   - [Changed](#changed-26)
-  - [Fixed](#fixed-29)
-- [0.33.1 .. 0.46.0](#0331--0460)
-  - [Added](#added-26)
-  - [Removed](#removed-9)
-  - [Changed](#changed-27)
   - [Fixed](#fixed-30)
-- [0.33.1](#0331)
+- [0.47.0](#0470)
+  - [Changed](#changed-27)
   - [Fixed](#fixed-31)
+- [0.33.1 .. 0.46.0](#0331--0460)
+  - [Added](#added-27)
+  - [Removed](#removed-10)
+  - [Changed](#changed-28)
+  - [Fixed](#fixed-32)
+- [0.33.1](#0331)
+  - [Fixed](#fixed-33)
 - [0.33.0](#0330)
 - [0.32.2](#0322)
-  - [Fixed](#fixed-32)
+  - [Fixed](#fixed-34)
 - [0.32.1](#0321)
-  - [Fixed](#fixed-33)
+  - [Fixed](#fixed-35)
 - [0.32.0](#0320)
-  - [Added](#added-27)
-  - [Changed](#changed-28)
-  - [Fixed](#fixed-34)
-- [0.31.0](#0310)
   - [Added](#added-28)
   - [Changed](#changed-29)
-  - [Deprecated](#deprecated-1)
-  - [Removed](#removed-10)
-  - [Fixed](#fixed-35)
-- [0.30.0](#0300)
+  - [Fixed](#fixed-36)
+- [0.31.0](#0310)
   - [Added](#added-29)
   - [Changed](#changed-30)
-  - [Deprecated](#deprecated-2)
-  - [Fixed](#fixed-36)
-- [0.29.0](#0290)
+  - [Deprecated](#deprecated-1)
+  - [Removed](#removed-11)
+  - [Fixed](#fixed-37)
+- [0.30.0](#0300)
   - [Added](#added-30)
   - [Changed](#changed-31)
-  - [Fixed](#fixed-37)
+  - [Deprecated](#deprecated-2)
+  - [Fixed](#fixed-38)
+- [0.29.0](#0290)
+  - [Added](#added-31)
+  - [Changed](#changed-32)
+  - [Fixed](#fixed-39)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 
 --------------------------------------------------------------------------------
 # Unreleased
+## Added
+## Changed
+## Removed
+## Fixed
+## Security
+
+# 0.69.1 (2023-11-02)
+
+## Fixed
+- Allow to run `bindgen -v` without an input header argument.
+
+# 0.69.0 (2023-11-01)
 
 ## Added
 - Added the `ParseCallbacks::header_file` callback which runs on every filename passed to `Builder::header`.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 25cad1e9..7e5cdc53 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -542,16 +542,11 @@ like the following is a useful way to check what has landed:
  $ git log --oneline v0.62.0..HEAD
  ```
 
-Also worth checking the [next-release tag](https://github.com/rust-lang/rust-bindgen/pulls?q=is%3Apr+label%3Anext-release).
-
-Once that's done and the changelog is up-to-date, run `doctoc` on it.
-
-If needed, install it locally by running:
-
-```
-$ npm install doctoc
-$ ./node_modules/doctoc/doctoc.js CHANGELOG.md
-```
+Also worth checking the [next-release
+tag](https://github.com/rust-lang/rust-bindgen/pulls?q=is%3Apr+label%3Anext-release).
+It is very important that you do not rename the `Unreleased` section of the
+changelog as this will be done automatically using `cargo release` on a further
+step.
 
 ### Merge to `main`
 
@@ -561,13 +556,21 @@ important fix) you can skip this.
 
 ### Tag and publish
 
-Once you're in the right branch, do:
+Once you're in `main`. Remember to install `doctoc` by running:
+```
+npm install doctoc
+```
 
+And then run:
 ```
-cargo release [patch|minor] --execute
+cargo release [patch|minor] --no-publish --execute
 ```
+
 This does the following:
 
+- Bump the version.
+- Turn the `Unreleased` section of the changelog into the section for the version being published.
+- Update the table of contents of the changelog using `doctoc`.
 - Tag (`git tag`) the HEAD commit
 - Publish (`cargo publish`) bindgen and bindgen-cli
 - Push (`git push`) to GitHub
@@ -602,4 +605,20 @@ cargo dist init # from "cargo install cargo-dist"
 cargo dist generate-ci # to update .github/workflows/release.yml
 ```
 
+### What to do if a Github release fails
+
+If the release process failed after you run `cargo release` you can manually
+delete the tag and release from Github. Also remember to delete the tag locally
+by running `git tag -d`. Once all the extra changes are in the `main` branch
+you can trigger a release by creating a new tag using `git tag` and push it
+using `git push --tag`.
+
+### Create a new crates.io release
+
+Go to [the Publish
+workflow](https://github.com/rust-lang/rust-bindgen/actions/workflows/publish.yml)
+and run a new workflow using the "Run Workflow" button.
+
+Remember that crates.io releases cannot be deleted!
+
 [prettyplease]: https://github.com/dtolnay/prettyplease
diff --git a/Cargo.lock b/Cargo.lock
index 40cb0777..a4d120a8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -23,7 +23,7 @@ dependencies = [
 
 [[package]]
 name = "bindgen"
-version = "0.68.1"
+version = "0.69.1"
 dependencies = [
  "annotate-snippets",
  "bitflags 2.2.1",
@@ -45,7 +45,7 @@ dependencies = [
 
 [[package]]
 name = "bindgen-cli"
-version = "0.68.1"
+version = "0.69.1"
 dependencies = [
  "bindgen",
  "clap",
@@ -203,17 +203,6 @@ dependencies = [
  "termcolor",
 ]
 
-[[package]]
-name = "errno"
-version = "0.2.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f639046355ee4f37944e44f60642c6f3a7efa3cf6b78c78a0d989a8ce6c396a1"
-dependencies = [
- "errno-dragonfly",
- "libc",
- "winapi",
-]
-
 [[package]]
 name = "errno"
 version = "0.3.1"
@@ -548,16 +537,16 @@ checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
 
 [[package]]
 name = "rustix"
-version = "0.36.7"
+version = "0.36.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d4fdebc4b395b7fbb9ab11e462e20ed9051e7b16e42d24042c776eca0ac81b03"
+checksum = "6da3636faa25820d8648e0e31c5d519bbb01f72fdf57131f0f5f7da5fed36eab"
 dependencies = [
  "bitflags 1.3.2",
- "errno 0.2.8",
+ "errno",
  "io-lifetimes",
  "libc",
  "linux-raw-sys 0.1.4",
- "windows-sys 0.42.0",
+ "windows-sys 0.45.0",
 ]
 
 [[package]]
@@ -567,7 +556,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "62b24138615de35e32031d041a09032ef3487a616d901ca4db224e7d557efae2"
 dependencies = [
  "bitflags 1.3.2",
- "errno 0.3.1",
+ "errno",
  "io-lifetimes",
  "libc",
  "linux-raw-sys 0.3.8",
@@ -623,7 +612,7 @@ dependencies = [
  "cfg-if",
  "fastrand",
  "redox_syscall",
- "rustix 0.36.7",
+ "rustix 0.36.16",
  "windows-sys 0.42.0",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index 3f674e69..0730e061 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,12 +36,6 @@ tag-name = "v{{version}}"
 # Don't release any crate unless its manifest has `release = true`
 release = false
 
-# Add version and date to changelog file
-[[workspace.metadata.release.pre-release-replacements]]
-file = "CHANGELOG.md"
-search = "# Unreleased"
-replace = "# {{version}} ({{date}})"
-
 # The profile that 'cargo dist' will build with
 [profile.dist]
 inherits = "release"
diff --git a/bindgen-cli/Cargo.toml b/bindgen-cli/Cargo.toml
index 07e77861..27389528 100644
--- a/bindgen-cli/Cargo.toml
+++ b/bindgen-cli/Cargo.toml
@@ -11,7 +11,7 @@ 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 = "0.68.1"
+version = "0.69.1"
 edition = "2018"
 rust-version = "1.64.0"
 
@@ -20,7 +20,7 @@ path = "main.rs"
 name = "bindgen"
 
 [dependencies]
-bindgen = { path = "../bindgen", version = "=0.68.1",  default-features = false, features = ["__cli", "experimental"] }
+bindgen = { path = "../bindgen", version = "=0.69.1",  default-features = false, features = ["__cli", "experimental"] }
 clap = { version = "4", features = ["derive"] }
 clap_complete = "4"
 env_logger = { version = "0.10.0", optional = true }
diff --git a/bindgen-cli/options.rs b/bindgen-cli/options.rs
index d52ccb8e..f82d3919 100644
--- a/bindgen-cli/options.rs
+++ b/bindgen-cli/options.rs
@@ -95,7 +95,7 @@ fn parse_custom_derive(
 )]
 struct BindgenCommand {
     /// C or C++ header file.
-    header: String,
+    header: Option<String>,
     /// Path to write depfile to.
     #[arg(long)]
     depfile: Option<String>,
@@ -589,7 +589,11 @@ where
 
     let mut builder = builder();
 
-    builder = builder.header(header);
+    if let Some(header) = header {
+        builder = builder.header(header);
+    } else {
+        return Err(io::Error::new(io::ErrorKind::Other, "Header not found"));
+    }
 
     if let Some(rust_target) = rust_target {
         builder = builder.rust_target(rust_target);
diff --git a/bindgen/Cargo.toml b/bindgen/Cargo.toml
index d7b6df9f..18f43c04 100644
--- a/bindgen/Cargo.toml
+++ b/bindgen/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 = "0.68.1"
+version = "0.69.1"
 edition = "2018"
 build = "build.rs"
 # If you change this, also update README.md and msrv in .github/workflows/bindgen.yml
@@ -65,3 +65,10 @@ features = ["experimental"]
 
 [package.metadata.release]
 release = true
+pre-release-hook = ["../node_modules/doctoc/doctoc.js", "../CHANGELOG.md"]
+
+# Add version and date to changelog file
+[[package.metadata.release.pre-release-replacements]]
+file = "../CHANGELOG.md"
+search = "# Unreleased"
+replace = "# Unreleased\n## Added\n## Changed\n## Removed\n## Fixed\n## Security\n\n# {{version}} ({{date}})"
diff --git a/bindgen/codegen/helpers.rs b/bindgen/codegen/helpers.rs
index 7ef44fe0..48bfe56d 100644
--- a/bindgen/codegen/helpers.rs
+++ b/bindgen/codegen/helpers.rs
@@ -232,6 +232,15 @@ pub(crate) mod ast_ty {
         //
         // Also, maybe this one shouldn't be the default?
         match (fk, ctx.options().convert_floats) {
+            (FloatKind::Float16, _) => {
+                // TODO: do f16 when rust lands it
+                ctx.generated_bindgen_float16();
+                if ctx.options().enable_cxx_namespaces {
+                    syn::parse_quote! { root::__BindgenFloat16 }
+                } else {
+                    syn::parse_quote! { __BindgenFloat16 }
+                }
+            }
             (FloatKind::Float, true) => syn::parse_quote! { f32 },
             (FloatKind::Double, true) => syn::parse_quote! { f64 },
             (FloatKind::Float, false) => raw_type(ctx, "c_float"),
diff --git a/bindgen/codegen/mod.rs b/bindgen/codegen/mod.rs
index 8e136063..c84320ce 100644
--- a/bindgen/codegen/mod.rs
+++ b/bindgen/codegen/mod.rs
@@ -578,6 +578,9 @@ impl CodeGenerator for Module {
                 if result.saw_incomplete_array {
                     utils::prepend_incomplete_array_types(ctx, &mut *result);
                 }
+                if ctx.need_bindgen_float16_type() {
+                    utils::prepend_float16_type(&mut *result);
+                }
                 if ctx.need_bindgen_complex_type() {
                     utils::prepend_complex_type(&mut *result);
                 }
@@ -5136,6 +5139,20 @@ pub(crate) mod utils {
         result.extend(old_items);
     }
 
+    pub(crate) fn prepend_float16_type(
+        result: &mut Vec<proc_macro2::TokenStream>,
+    ) {
+        let float16_type = quote! {
+            #[derive(PartialEq, Copy, Clone, Hash, Debug, Default)]
+            #[repr(transparent)]
+            pub struct __BindgenFloat16(pub u16);
+        };
+
+        let items = vec![float16_type];
+        let old_items = mem::replace(result, items);
+        result.extend(old_items);
+    }
+
     pub(crate) fn prepend_complex_type(
         result: &mut Vec<proc_macro2::TokenStream>,
     ) {
diff --git a/bindgen/codegen/serialize.rs b/bindgen/codegen/serialize.rs
index 02c46802..9765a8bd 100644
--- a/bindgen/codegen/serialize.rs
+++ b/bindgen/codegen/serialize.rs
@@ -270,6 +270,7 @@ impl<'a> CSerialize<'a> for Type {
                     write!(writer, "const ")?;
                 }
                 match float_kind {
+                    FloatKind::Float16 => write!(writer, "_Float16")?,
                     FloatKind::Float => write!(writer, "float")?,
                     FloatKind::Double => write!(writer, "double")?,
                     FloatKind::LongDouble => write!(writer, "long double")?,
@@ -281,6 +282,7 @@ impl<'a> CSerialize<'a> for Type {
                     write!(writer, "const ")?;
                 }
                 match float_kind {
+                    FloatKind::Float16 => write!(writer, "_Float16 complex")?,
                     FloatKind::Float => write!(writer, "float complex")?,
                     FloatKind::Double => write!(writer, "double complex")?,
                     FloatKind::LongDouble => {
diff --git a/bindgen/codegen/struct_layout.rs b/bindgen/codegen/struct_layout.rs
index 56730603..83d78361 100644
--- a/bindgen/codegen/struct_layout.rs
+++ b/bindgen/codegen/struct_layout.rs
@@ -156,9 +156,7 @@ impl<'a> StructLayoutTracker<'a> {
 
         self.latest_field_layout = Some(layout);
         self.last_field_was_bitfield = true;
-        // NB: We intentionally don't update the max_field_align here, since our
-        // bitfields code doesn't necessarily guarantee it, so we need to
-        // actually generate the dummy alignment.
+        self.max_field_align = cmp::max(self.max_field_align, layout.align);
     }
 
     /// Returns a padding field if necessary for a given new field _before_
diff --git a/bindgen/ir/context.rs b/bindgen/ir/context.rs
index c5e2832c..11048b70 100644
--- a/bindgen/ir/context.rs
+++ b/bindgen/ir/context.rs
@@ -386,6 +386,9 @@ pub(crate) struct BindgenContext {
     /// Whether a bindgen complex was generated
     generated_bindgen_complex: Cell<bool>,
 
+    /// Whether a bindgen float16 was generated
+    generated_bindgen_float16: Cell<bool>,
+
     /// The set of `ItemId`s that are allowlisted. This the very first thing
     /// computed after parsing our IR, and before running any of our analyses.
     allowlisted: Option<ItemSet>,
@@ -585,6 +588,7 @@ If you encounter an error missing from this list, please file an issue or a PR!"
             target_info,
             options,
             generated_bindgen_complex: Cell::new(false),
+            generated_bindgen_float16: Cell::new(false),
             allowlisted: None,
             blocklisted_types_implement_traits: Default::default(),
             codegen_items: None,
@@ -2005,6 +2009,7 @@ If you encounter an error missing from this list, please file an issue or a PR!"
             CXType_ULongLong => TypeKind::Int(IntKind::ULongLong),
             CXType_Int128 => TypeKind::Int(IntKind::I128),
             CXType_UInt128 => TypeKind::Int(IntKind::U128),
+            CXType_Float16 | CXType_Half => TypeKind::Float(FloatKind::Float16),
             CXType_Float => TypeKind::Float(FloatKind::Float),
             CXType_Double => TypeKind::Float(FloatKind::Double),
             CXType_LongDouble => TypeKind::Float(FloatKind::LongDouble),
@@ -2013,6 +2018,7 @@ If you encounter an error missing from this list, please file an issue or a PR!"
                 let float_type =
                     ty.elem_type().expect("Not able to resolve complex type?");
                 let float_kind = match float_type.kind() {
+                    CXType_Float16 | CXType_Half => FloatKind::Float16,
                     CXType_Float => FloatKind::Float,
                     CXType_Double => FloatKind::Double,
                     CXType_LongDouble => FloatKind::LongDouble,
@@ -2528,6 +2534,16 @@ If you encounter an error missing from this list, please file an issue or a PR!"
         self.generated_bindgen_complex.get()
     }
 
+    /// Call if a bindgen float16 is generated
+    pub(crate) fn generated_bindgen_float16(&self) {
+        self.generated_bindgen_float16.set(true)
+    }
+
+    /// Whether we need to generate the bindgen float16 type
+    pub(crate) fn need_bindgen_float16_type(&self) -> bool {
+        self.generated_bindgen_float16.get()
+    }
+
     /// Compute which `enum`s have an associated `typedef` definition.
     fn compute_enum_typedef_combos(&mut self) {
         let _t = self.timer("compute_enum_typedef_combos");
diff --git a/bindgen/ir/function.rs b/bindgen/ir/function.rs
index 5bfb70ef..6342758f 100644
--- a/bindgen/ir/function.rs
+++ b/bindgen/ir/function.rs
@@ -303,6 +303,7 @@ fn get_abi(cc: CXCallingConv) -> ClangAbi {
         CXCallingConv_X86VectorCall => ClangAbi::Known(Abi::Vectorcall),
         CXCallingConv_AAPCS => ClangAbi::Known(Abi::Aapcs),
         CXCallingConv_X86_64Win64 => ClangAbi::Known(Abi::Win64),
+        CXCallingConv_AArch64VectorCall => ClangAbi::Known(Abi::Vectorcall),
         other => ClangAbi::Unknown(other),
     }
 }
diff --git a/bindgen/ir/item.rs b/bindgen/ir/item.rs
index 4abca5c4..dd587b08 100644
--- a/bindgen/ir/item.rs
+++ b/bindgen/ir/item.rs
@@ -98,13 +98,13 @@ pub(crate) trait ItemAncestors {
     fn ancestors<'a>(&self, ctx: &'a BindgenContext) -> ItemAncestorsIter<'a>;
 }
 
-#[cfg(__testing_only_extra_assertions)]
+#[cfg(feature = "__testing_only_extra_assertions")]
 type DebugOnlyItemSet = ItemSet;
 
-#[cfg(not(__testing_only_extra_assertions))]
+#[cfg(not(feature = "__testing_only_extra_assertions"))]
 struct DebugOnlyItemSet;
 
-#[cfg(not(__testing_only_extra_assertions))]
+#[cfg(not(feature = "__testing_only_extra_assertions"))]
 impl DebugOnlyItemSet {
     fn new() -> Self {
         DebugOnlyItemSet
@@ -1432,57 +1432,58 @@ impl Item {
             }
         }
 
-        // Guess how does clang treat extern "C" blocks?
-        if cursor.kind() == CXCursor_UnexposedDecl {
-            Err(ParseError::Recurse)
-        } else {
+        match cursor.kind() {
+            // On Clang 18+, extern "C" is reported accurately as a LinkageSpec.
+            // Older LLVM treat it as UnexposedDecl.
+            CXCursor_LinkageSpec | CXCursor_UnexposedDecl => {
+                Err(ParseError::Recurse)
+            }
+
             // We allowlist cursors here known to be unhandled, to prevent being
             // too noisy about this.
-            match cursor.kind() {
-                CXCursor_MacroDefinition |
-                CXCursor_MacroExpansion |
-                CXCursor_UsingDeclaration |
-                CXCursor_UsingDirective |
-                CXCursor_StaticAssert |
-                CXCursor_FunctionTemplate => {
-                    debug!(
-                        "Unhandled cursor kind {:?}: {:?}",
-                        cursor.kind(),
-                        cursor
-                    );
-                }
-                CXCursor_InclusionDirective => {
-                    let file = cursor.get_included_file_name();
-                    match file {
-                        None => {
-                            warn!(
-                                "Inclusion of a nameless file in {:?}",
-                                cursor
-                            );
-                        }
-                        Some(included_file) => {
-                            for cb in &ctx.options().parse_callbacks {
-                                cb.include_file(&included_file);
-                            }
+            CXCursor_MacroDefinition |
+            CXCursor_MacroExpansion |
+            CXCursor_UsingDeclaration |
+            CXCursor_UsingDirective |
+            CXCursor_StaticAssert |
+            CXCursor_FunctionTemplate => {
+                debug!(
+                    "Unhandled cursor kind {:?}: {:?}",
+                    cursor.kind(),
+                    cursor
+                );
+                Err(ParseError::Continue)
+            }
 
-                            ctx.add_dep(included_file.into_boxed_str());
-                        }
+            CXCursor_InclusionDirective => {
+                let file = cursor.get_included_file_name();
+                match file {
+                    None => {
+                        warn!("Inclusion of a nameless file in {:?}", cursor);
                     }
-                }
-                _ => {
-                    // ignore toplevel operator overloads
-                    let spelling = cursor.spelling();
-                    if !spelling.starts_with("operator") {
-                        warn!(
-                            "Unhandled cursor kind {:?}: {:?}",
-                            cursor.kind(),
-                            cursor
-                        );
+                    Some(included_file) => {
+                        for cb in &ctx.options().parse_callbacks {
+                            cb.include_file(&included_file);
+                        }
+
+                        ctx.add_dep(included_file.into_boxed_str());
                     }
                 }
+                Err(ParseError::Continue)
             }
 
-            Err(ParseError::Continue)
+            _ => {
+                // ignore toplevel operator overloads
+                let spelling = cursor.spelling();
+                if !spelling.starts_with("operator") {
+                    warn!(
+                        "Unhandled cursor kind {:?}: {:?}",
+                        cursor.kind(),
+                        cursor
+                    );
+                }
+                Err(ParseError::Continue)
+            }
         }
     }
 
diff --git a/bindgen/ir/ty.rs b/bindgen/ir/ty.rs
index 1aee0659..b7a42932 100644
--- a/bindgen/ir/ty.rs
+++ b/bindgen/ir/ty.rs
@@ -558,6 +558,8 @@ impl TemplateParameters for TypeKind {
 /// The kind of float this type represents.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub(crate) enum FloatKind {
+    /// A half (`_Float16` or `__fp16`)
+    Float16,
     /// A `float`.
     Float,
     /// A `double`.


Test patch:
diff --git a/bindgen-tests/tests/expectations/tests/bitfield-32bit-overflow.rs b/bindgen-tests/tests/expectations/tests/bitfield-32bit-overflow.rs
index cf045436..ea126bbb 100644
--- a/bindgen-tests/tests/expectations/tests/bitfield-32bit-overflow.rs
+++ b/bindgen-tests/tests/expectations/tests/bitfield-32bit-overflow.rs
@@ -83,7 +83,7 @@ where
         }
     }
 }
-#[repr(C, packed)]
+#[repr(C)]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct MuchBitfield {
     pub _bitfield_align_1: [u8; 0],
diff --git a/bindgen-tests/tests/expectations/tests/bitfield-method-same-name.rs b/bindgen-tests/tests/expectations/tests/bitfield-method-same-name.rs
index 8cd1997a..ce3ea41e 100644
--- a/bindgen-tests/tests/expectations/tests/bitfield-method-same-name.rs
+++ b/bindgen-tests/tests/expectations/tests/bitfield-method-same-name.rs
@@ -83,7 +83,7 @@ where
         }
     }
 }
-#[repr(C, packed)]
+#[repr(C)]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Foo {
     pub _bitfield_align_1: [u8; 0],
diff --git a/bindgen-tests/tests/expectations/tests/bitfield_align.rs b/bindgen-tests/tests/expectations/tests/bitfield_align.rs
index 559038ed..80023279 100644
--- a/bindgen-tests/tests/expectations/tests/bitfield_align.rs
+++ b/bindgen-tests/tests/expectations/tests/bitfield_align.rs
@@ -332,7 +332,6 @@ impl A {
     }
 }
 #[repr(C)]
-#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct B {
     pub _bitfield_align_1: [u32; 0],
diff --git a/bindgen-tests/tests/expectations/tests/bitfield_align_2.rs b/bindgen-tests/tests/expectations/tests/bitfield_align_2.rs
index dc49137e..963d86f9 100644
--- a/bindgen-tests/tests/expectations/tests/bitfield_align_2.rs
+++ b/bindgen-tests/tests/expectations/tests/bitfield_align_2.rs
@@ -93,7 +93,6 @@ pub enum MyEnum {
     FOUR = 3,
 }
 #[repr(C)]
-#[repr(align(8))]
 #[derive(Debug, Copy, Clone)]
 pub struct TaggedPtr {
     pub _bitfield_align_1: [u64; 0],
diff --git a/bindgen-tests/tests/expectations/tests/bitfield_method_mangling.rs b/bindgen-tests/tests/expectations/tests/bitfield_method_mangling.rs
index ea1502eb..7104682e 100644
--- a/bindgen-tests/tests/expectations/tests/bitfield_method_mangling.rs
+++ b/bindgen-tests/tests/expectations/tests/bitfield_method_mangling.rs
@@ -84,7 +84,6 @@ where
     }
 }
 #[repr(C)]
-#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct mach_msg_type_descriptor_t {
     pub _bitfield_align_1: [u32; 0],
diff --git a/bindgen-tests/tests/expectations/tests/bitfield_pragma_packed.rs b/bindgen-tests/tests/expectations/tests/bitfield_pragma_packed.rs
index c37b42f2..e3168f51 100644
--- a/bindgen-tests/tests/expectations/tests/bitfield_pragma_packed.rs
+++ b/bindgen-tests/tests/expectations/tests/bitfield_pragma_packed.rs
@@ -83,7 +83,7 @@ where
         }
     }
 }
-#[repr(C, packed)]
+#[repr(C)]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Struct {
     pub _bitfield_align_1: [u8; 0],
@@ -215,3 +215,97 @@ impl Struct {
         __bindgen_bitfield_unit
     }
 }
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct Inner {
+    pub _bitfield_align_1: [u16; 0],
+    pub _bitfield_1: __BindgenBitfieldUnit<[u8; 4usize]>,
+}
+#[test]
+fn bindgen_test_layout_Inner() {
+    assert_eq!(
+        ::std::mem::size_of::<Inner>(),
+        4usize,
+        concat!("Size of: ", stringify!(Inner)),
+    );
+    assert_eq!(
+        ::std::mem::align_of::<Inner>(),
+        2usize,
+        concat!("Alignment of ", stringify!(Inner)),
+    );
+}
+impl Inner {
+    #[inline]
+    pub fn a(&self) -> ::std::os::raw::c_ushort {
+        unsafe { ::std::mem::transmute(self._bitfield_1.get(0usize, 16u8) as u16) }
+    }
+    #[inline]
+    pub fn set_a(&mut self, val: ::std::os::raw::c_ushort) {
+        unsafe {
+            let val: u16 = ::std::mem::transmute(val);
+            self._bitfield_1.set(0usize, 16u8, val as u64)
+        }
+    }
+    #[inline]
+    pub fn b(&self) -> ::std::os::raw::c_ushort {
+        unsafe { ::std::mem::transmute(self._bitfield_1.get(16usize, 16u8) as u16) }
+    }
+    #[inline]
+    pub fn set_b(&mut self, val: ::std::os::raw::c_ushort) {
+        unsafe {
+            let val: u16 = ::std::mem::transmute(val);
+            self._bitfield_1.set(16usize, 16u8, val as u64)
+        }
+    }
+    #[inline]
+    pub fn new_bitfield_1(
+        a: ::std::os::raw::c_ushort,
+        b: ::std::os::raw::c_ushort,
+    ) -> __BindgenBitfieldUnit<[u8; 4usize]> {
+        let mut __bindgen_bitfield_unit: __BindgenBitfieldUnit<[u8; 4usize]> = Default::default();
+        __bindgen_bitfield_unit
+            .set(
+                0usize,
+                16u8,
+                {
+                    let a: u16 = unsafe { ::std::mem::transmute(a) };
+                    a as u64
+                },
+            );
+        __bindgen_bitfield_unit
+            .set(
+                16usize,
+                16u8,
+                {
+                    let b: u16 = unsafe { ::std::mem::transmute(b) };
+                    b as u64
+                },
+            );
+        __bindgen_bitfield_unit
+    }
+}
+#[repr(C, packed)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct Outer {
+    pub inner: Inner,
+}
+#[test]
+fn bindgen_test_layout_Outer() {
+    const UNINIT: ::std::mem::MaybeUninit<Outer> = ::std::mem::MaybeUninit::uninit();
+    let ptr = UNINIT.as_ptr();
+    assert_eq!(
+        ::std::mem::size_of::<Outer>(),
+        4usize,
+        concat!("Size of: ", stringify!(Outer)),
+    );
+    assert_eq!(
+        ::std::mem::align_of::<Outer>(),
+        1usize,
+        concat!("Alignment of ", stringify!(Outer)),
+    );
+    assert_eq!(
+        unsafe { ::std::ptr::addr_of!((*ptr).inner) as usize - ptr as usize },
+        0usize,
+        concat!("Offset of field: ", stringify!(Outer), "::", stringify!(inner)),
+    );
+}
diff --git a/bindgen-tests/tests/expectations/tests/default_visibility_crate.rs b/bindgen-tests/tests/expectations/tests/default_visibility_crate.rs
index f75a06e9..aef1a61a 100644
--- a/bindgen-tests/tests/expectations/tests/default_visibility_crate.rs
+++ b/bindgen-tests/tests/expectations/tests/default_visibility_crate.rs
@@ -89,7 +89,7 @@ pub struct Point {
     pub(crate) x: ::std::os::raw::c_int,
     pub(crate) y: ::std::os::raw::c_int,
 }
-#[repr(C, packed)]
+#[repr(C)]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Color {
     pub(crate) _bitfield_align_1: [u8; 0],
diff --git a/bindgen-tests/tests/expectations/tests/default_visibility_private.rs b/bindgen-tests/tests/expectations/tests/default_visibility_private.rs
index 9bd6409f..8b3099c0 100644
--- a/bindgen-tests/tests/expectations/tests/default_visibility_private.rs
+++ b/bindgen-tests/tests/expectations/tests/default_visibility_private.rs
@@ -89,7 +89,7 @@ pub struct Point {
     x: ::std::os::raw::c_int,
     y: ::std::os::raw::c_int,
 }
-#[repr(C, packed)]
+#[repr(C)]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Color {
     _bitfield_align_1: [u8; 0],
diff --git a/bindgen-tests/tests/expectations/tests/default_visibility_private_respects_cxx_access_spec.rs b/bindgen-tests/tests/expectations/tests/default_visibility_private_respects_cxx_access_spec.rs
index a8b0d297..29fbb3a8 100644
--- a/bindgen-tests/tests/expectations/tests/default_visibility_private_respects_cxx_access_spec.rs
+++ b/bindgen-tests/tests/expectations/tests/default_visibility_private_respects_cxx_access_spec.rs
@@ -89,7 +89,7 @@ pub struct Point {
     pub x: ::std::os::raw::c_int,
     pub y: ::std::os::raw::c_int,
 }
-#[repr(C, packed)]
+#[repr(C)]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Color {
     _bitfield_align_1: [u8; 0],
diff --git a/bindgen-tests/tests/expectations/tests/float16.rs b/bindgen-tests/tests/expectations/tests/float16.rs
new file mode 100644
index 00000000..b5471b1e
--- /dev/null
+++ b/bindgen-tests/tests/expectations/tests/float16.rs
@@ -0,0 +1,66 @@
+#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+#[derive(PartialEq, Copy, Clone, Hash, Debug, Default)]
+#[repr(transparent)]
+pub struct __BindgenFloat16(pub u16);
+extern "C" {
+    pub static mut global: __BindgenFloat16;
+}
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone, PartialEq)]
+pub struct Test__Float16 {
+    pub f: __BindgenFloat16,
+}
+#[test]
+fn bindgen_test_layout_Test__Float16() {
+    const UNINIT: ::std::mem::MaybeUninit<Test__Float16> = ::std::mem::MaybeUninit::uninit();
+    let ptr = UNINIT.as_ptr();
+    assert_eq!(
+        ::std::mem::size_of::<Test__Float16>(),
+        2usize,
+        concat!("Size of: ", stringify!(Test__Float16)),
+    );
+    assert_eq!(
+        ::std::mem::align_of::<Test__Float16>(),
+        2usize,
+        concat!("Alignment of ", stringify!(Test__Float16)),
+    );
+    assert_eq!(
+        unsafe { ::std::ptr::addr_of!((*ptr).f) as usize - ptr as usize },
+        0usize,
+        concat!("Offset of field: ", stringify!(Test__Float16), "::", stringify!(f)),
+    );
+}
+#[repr(C)]
+#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
+pub struct Test__Float16Ref {
+    pub f: *mut __BindgenFloat16,
+}
+#[test]
+fn bindgen_test_layout_Test__Float16Ref() {
+    const UNINIT: ::std::mem::MaybeUninit<Test__Float16Ref> = ::std::mem::MaybeUninit::uninit();
+    let ptr = UNINIT.as_ptr();
+    assert_eq!(
+        ::std::mem::size_of::<Test__Float16Ref>(),
+        8usize,
+        concat!("Size of: ", stringify!(Test__Float16Ref)),
+    );
+    assert_eq!(
+        ::std::mem::align_of::<Test__Float16Ref>(),
+        8usize,
+        concat!("Alignment of ", stringify!(Test__Float16Ref)),
+    );
+    assert_eq!(
+        unsafe { ::std::ptr::addr_of!((*ptr).f) as usize - ptr as usize },
+        0usize,
+        concat!("Offset of field: ", stringify!(Test__Float16Ref), "::", stringify!(f)),
+    );
+}
+impl Default for Test__Float16Ref {
+    fn default() -> Self {
+        let mut s = ::std::mem::MaybeUninit::<Self>::uninit();
+        unsafe {
+            ::std::ptr::write_bytes(s.as_mut_ptr(), 0, 1);
+            s.assume_init()
+        }
+    }
+}
diff --git a/bindgen-tests/tests/expectations/tests/issue-1034.rs b/bindgen-tests/tests/expectations/tests/issue-1034.rs
index 0bd7647a..7848090f 100644
--- a/bindgen-tests/tests/expectations/tests/issue-1034.rs
+++ b/bindgen-tests/tests/expectations/tests/issue-1034.rs
@@ -83,7 +83,7 @@ where
         }
     }
 }
-#[repr(C, packed)]
+#[repr(C)]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct S2 {
     pub _bitfield_align_1: [u8; 0],
diff --git a/bindgen-tests/tests/expectations/tests/issue-1076-unnamed-bitfield-alignment.rs b/bindgen-tests/tests/expectations/tests/issue-1076-unnamed-bitfield-alignment.rs
index d8880695..89c09cc6 100644
--- a/bindgen-tests/tests/expectations/tests/issue-1076-unnamed-bitfield-alignment.rs
+++ b/bindgen-tests/tests/expectations/tests/issue-1076-unnamed-bitfield-alignment.rs
@@ -83,7 +83,7 @@ where
         }
     }
 }
-#[repr(C, packed)]
+#[repr(C)]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct S1 {
     pub _bitfield_align_1: [u8; 0],
diff --git a/bindgen-tests/tests/expectations/tests/issue-1947.rs b/bindgen-tests/tests/expectations/tests/issue-1947.rs
index 24aa3548..be623357 100644
--- a/bindgen-tests/tests/expectations/tests/issue-1947.rs
+++ b/bindgen-tests/tests/expectations/tests/issue-1947.rs
@@ -86,7 +86,6 @@ where
 pub type U8 = ::std::os::raw::c_uchar;
 pub type U16 = ::std::os::raw::c_ushort;
 #[repr(C)]
-#[repr(align(2))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct V56AMDY {
     pub _bitfield_align_1: [u16; 0],
diff --git a/bindgen-tests/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs b/bindgen-tests/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs
index adea1cbe..7bc99336 100644
--- a/bindgen-tests/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs
+++ b/bindgen-tests/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs
@@ -85,7 +85,6 @@ where
     }
 }
 #[repr(C)]
-#[repr(align(8))]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct Foo {
     pub _bitfield_align_1: [u64; 0],
diff --git a/bindgen-tests/tests/expectations/tests/jsval_layout_opaque.rs b/bindgen-tests/tests/expectations/tests/jsval_layout_opaque.rs
index 735cebfb..576f5758 100644
--- a/bindgen-tests/tests/expectations/tests/jsval_layout_opaque.rs
+++ b/bindgen-tests/tests/expectations/tests/jsval_layout_opaque.rs
@@ -181,7 +181,6 @@ pub union jsval_layout {
     pub asUIntPtr: usize,
 }
 #[repr(C)]
-#[repr(align(8))]
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct jsval_layout__bindgen_ty_1 {
     pub _bitfield_align_1: [u64; 0],
diff --git a/bindgen-tests/tests/expectations/tests/jsval_layout_opaque_1_0.rs b/bindgen-tests/tests/expectations/tests/jsval_layout_opaque_1_0.rs
index 2e64796b..0889b652 100644
--- a/bindgen-tests/tests/expectations/tests/jsval_layout_opaque_1_0.rs
+++ b/bindgen-tests/tests/expectations/tests/jsval_layout_opaque_1_0.rs
@@ -229,7 +229,6 @@ pub struct jsval_layout {
 pub struct jsval_layout__bindgen_ty_1 {
     pub _bitfield_align_1: [u64; 0],
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 8usize]>,
-    pub __bindgen_align: [u64; 0usize],
 }
 #[test]
 fn bindgen_test_layout_jsval_layout__bindgen_ty_1() {
diff --git a/bindgen-tests/tests/expectations/tests/only_bitfields.rs b/bindgen-tests/tests/expectations/tests/only_bitfields.rs
index 42ea60f1..fe216f4b 100644
--- a/bindgen-tests/tests/expectations/tests/only_bitfields.rs
+++ b/bindgen-tests/tests/expectations/tests/only_bitfields.rs
@@ -83,7 +83,7 @@ where
         }
     }
 }
-#[repr(C, packed)]
+#[repr(C)]
 #[derive(Debug, Default, Copy, Clone)]
 pub struct C {
     pub _bitfield_align_1: [u8; 0],
diff --git a/bindgen-tests/tests/expectations/tests/union_bitfield.rs b/bindgen-tests/tests/expectations/tests/union_bitfield.rs
index 096c0371..7f4bd37f 100644
--- a/bindgen-tests/tests/expectations/tests/union_bitfield.rs
+++ b/bindgen-tests/tests/expectations/tests/union_bitfield.rs
@@ -142,7 +142,6 @@ impl U4 {
     }
 }
 #[repr(C)]
-#[repr(align(4))]
 #[derive(Copy, Clone)]
 pub union B {
     pub _bitfield_align_1: [u32; 0],
diff --git a/bindgen-tests/tests/expectations/tests/union_with_anon_struct_bitfield.rs b/bindgen-tests/tests/expectations/tests/union_with_anon_struct_bitfield.rs
index 2f990271..48a1bda9 100644
--- a/bindgen-tests/tests/expectations/tests/union_with_anon_struct_bitfield.rs
+++ b/bindgen-tests/tests/expectations/tests/union_with_anon_struct_bitfield.rs
@@ -90,7 +90,6 @@ pub union foo {
     pub __bindgen_anon_1: foo__bindgen_ty_1,
 }
 #[repr(C)]
-#[repr(align(4))]
 #[derive(Debug, Default, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct foo__bindgen_ty_1 {
     pub _bitfield_align_1: [u32; 0],
diff --git a/bindgen-tests/tests/expectations/tests/union_with_anon_struct_bitfield_1_0.rs b/bindgen-tests/tests/expectations/tests/union_with_anon_struct_bitfield_1_0.rs
index dec7fc29..530cb7ea 100644
--- a/bindgen-tests/tests/expectations/tests/union_with_anon_struct_bitfield_1_0.rs
+++ b/bindgen-tests/tests/expectations/tests/union_with_anon_struct_bitfield_1_0.rs
@@ -138,7 +138,6 @@ pub struct foo {
 pub struct foo__bindgen_ty_1 {
     pub _bitfield_align_1: [u32; 0],
     pub _bitfield_1: __BindgenBitfieldUnit<[u8; 4usize]>,
-    pub __bindgen_align: [u32; 0usize],
 }
 #[test]
 fn bindgen_test_layout_foo__bindgen_ty_1() {
diff --git a/bindgen-tests/tests/headers/bitfield_pragma_packed.h b/bindgen-tests/tests/headers/bitfield_pragma_packed.h
index b4011ca8..c18b80dd 100644
--- a/bindgen-tests/tests/headers/bitfield_pragma_packed.h
+++ b/bindgen-tests/tests/headers/bitfield_pragma_packed.h
@@ -7,3 +7,14 @@ struct Struct {
     unsigned char e : 8;
 };
 #pragma pack(pop)
+
+struct Inner {
+    unsigned short a: 16;
+    unsigned short b: 16;
+};
+
+#pragma pack(push, 1)
+struct Outer {
+    struct Inner inner;
+};
+#pragma pop
diff --git a/bindgen-tests/tests/headers/float16.h b/bindgen-tests/tests/headers/float16.h
new file mode 100644
index 00000000..3b105859
--- /dev/null
+++ b/bindgen-tests/tests/headers/float16.h
@@ -0,0 +1,36 @@
+// bindgen-flags: --with-derive-hash --with-derive-partialeq --with-derive-eq
+
+static __fp16 global;
+
+struct Test__Float16
+{
+    __fp16 f;
+};
+
+struct Test__Float16Ref
+{
+    __fp16 *f;
+};
+
+/*
+// This options are currently supported only on specific targets (eg. x86 with sse2)
+_Float16 returns_f16();
+
+void gets_f16(_Float16 arg);
+
+struct Test__Float16_Complex
+{
+    _Float16 _Complex mMember;
+};
+
+struct Test__Float16_ComplexPtr
+{
+    _Float16 _Complex *mMember;
+};
+
+_Float16 _Complex globalValueHalf;
+
+_Float16 _Complex returns_f16_complex();
+
+void gets_f16_complex(_Float16 _Complex arg);
+*/
\ No newline at end of file