Extra padding added in Windows to packed struct with bitfields

Input C/C++ Header

#ifndef _PACKED_H_
#define _PACKED_H_

#include <stdint.h>

struct mystruct {
	unsigned	a : 2;
	unsigned	b : 4;
	unsigned	c : 3;
	unsigned	d : 5;
	unsigned	e : 2;
	uint16_t	f;
	uint32_t	g;
} __attribute__((packed));

#endif

Bindgen Invocation

let bindings = bindgen::Builder::default()
    .header("wrapper.h")
    .parse_callbacks(Box::new(bindgen::CargoCallbacks))
    .generate()
    .expect("Unable to generate bindings");

Actual Results

In Windows:

#[repr(C, packed)]
#[derive(Debug, Copy, Clone)]
pub struct mystruct {
    pub _bitfield_1: __BindgenBitfieldUnit<[u8; 2usize], u8>,
    pub f: u16,
    pub g: u32,
    pub __bindgen_padding_0: [u8; 2usize],
}

Expected Results

In Linux:

#[repr(C, packed)]
#[derive(Debug, Copy, Clone)]
pub struct mystruct {
    pub _bitfield_1: __BindgenBitfieldUnit<[u8; 2usize], u8>,
    pub f: u16,
    pub g: u32,
}

Link to repo

https://github.com/Olangu/bindgen-bug

Reproduce the issue with the shown wrapper.h input and bindgen::Builder invocation on Windows and Linux. Compare the generated #[repr(C, packed)] mystruct definitions and trace why Windows emits __bindgen_padding_0; done means the unnecessary padding is absent while the bindings remain correct on both platforms.