#[derive] is used on #[repr(packed)] struct that does not derive Copy (E0133) #2083
Description
Thank you @emilio for fixing the last issue.
I have another issue here.
I am using rust 1.53 and bindgen 0.59.1
Input C/C++ Header
struct packed_wo_copy {
short f1;
char f2[0];
} __attribute__((packed));
Actual Results
#[repr(C)]
#[derive(Default)]
pub struct __IncompleteArrayField<T>(::std::marker::PhantomData<T>, [T; 0]);
impl<T> __IncompleteArrayField<T> {
#[inline]
pub const fn new() -> Self {
__IncompleteArrayField(::std::marker::PhantomData, [])
}
#[inline]
pub fn as_ptr(&self) -> *const T {
self as *const _ as *const T
}
#[inline]
pub fn as_mut_ptr(&mut self) -> *mut T {
self as *mut _ as *mut T
}
#[inline]
pub unsafe fn as_slice(&self, len: usize) -> &[T] {
::std::slice::from_raw_parts(self.as_ptr(), len)
}
#[inline]
pub unsafe fn as_mut_slice(&mut self, len: usize) -> &mut [T] {
::std::slice::from_raw_parts_mut(self.as_mut_ptr(), len)
}
}
impl<T> ::std::fmt::Debug for __IncompleteArrayField<T> {
fn fmt(&self, fmt: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
fmt.write_str("__IncompleteArrayField")
}
}
#[repr(C, packed)]
#[derive(Debug)]
pub struct packed_wo_copy {
pub f1: ::std::os::raw::c_short,
pub f2: __IncompleteArrayField<::std::os::raw::c_char>,
}and compilation errors generated when compiling the bindings with rustc
warning: `#[derive]` can't be used on a `#[repr(packed)]` struct that does not derive Copy (error E0133)
--> packed.rs:34:10
|
34 | #[derive(Debug)]
| ^^^^^
|
= note: `#[warn(unaligned_references)]` on by default
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
= note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523>
= note: this warning originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
warning: 1 warning emitted
Expected Results
Maybe no Debug derivative?