cargo 编译报错

[lbc19920615]

windows11

error[E0793]: reference to packed field is unaligned
    --> C:\Users\lbc15\.cargo\registry\src\index.crates.io-6f17d22bba15001f\ntapi-0.3.7\src\ntexapi.rs:2783:52
     |
2783 |         *tick_count.QuadPart_mut() = read_volatile(&(*USER_SHARED_DATA).u.TickCountQuad);
     |                                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
     = note: packed structs are only aligned by one byte, and many modern architectures penalize unaligned field accesses
     = note: creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
     = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)

error[E0793]: reference to packed field is unaligned
    --> C:\Users\lbc15\.cargo\registry\src\index.crates.io-6f17d22bba15001f\ntapi-0.3.7\src\ntexapi.rs:2807:25
     |
2807 |         ((read_volatile(&(*USER_SHARED_DATA).u.TickCountQuad)
     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
     = note: packed structs are only aligned by one byte, and many modern architectures penalize unaligned field accesses
     = note: creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
     = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)

   Compiling tui v0.19.0
   Compiling failure v0.1.8
For more information about this error, try `rustc --explain E0793`.
error: could not compile `ntapi` (lib) due to 2 previous errors
warning: build failed, waiting for other jobs to finish...
PS D:\projects\rust_demos\RustPlayer> rustc --explain E0793
An unaligned references to a field of a [packed] struct got created.

Erroneous code example:

#[repr(packed)]
pub struct Foo {
field1: u64,
field2: u8,
}

unsafe {
let foo = Foo { field1: 0, field2: 0 };
// Accessing the field directly is fine.
let val = foo.field1;
// A reference to a packed field causes a error.
let val = &foo.field1; // ERROR
// An implicit & is added in format strings, causing the same error.
println!("{}", foo.field1); // ERROR
}

Creating a reference to an insufficiently aligned packed field is
[undefined behavior] and therefore disallowed. Using an `unsafe` block does not
change anything about this. Instead, the code should do a copy of the data in
the packed field or use raw pointers and unaligned accesses.

#[repr(packed)]
pub struct Foo {
field1: u64,
field2: u8,
}

unsafe {
let foo = Foo { field1: 0, field2: 0 };

// Instead of a reference, we can create a raw pointer...
let ptr = std::ptr::addr_of!(foo.field1);
// ... and then (crucially!) access it in an explicitly unaligned way.
let val = unsafe { ptr.read_unaligned() };
// This would *NOT* be correct:
// let val = unsafe { *ptr }; // Undefined Behavior due to unaligned load!

// For formatting, we can create a copy to avoid the direct reference.
let copy = foo.field1;
println!("{}", copy);
// Creating a copy can be written in a single line with curly braces.
// (This is equivalent to the two lines above.)
println!("{}", { foo.field1 });

}

### Additional information

Note that this error is specifically about *references* to packed fields.
Direct by-value access of those fields is fine, since then the compiler has
enough information to generate the correct kind of access.

See [issue #82523] for more information.

[packed]: https://doc.rust-lang.org/reference/type-layout.html#the-alignment-modifiers
[undefined behavior]: https://doc.rust-lang.org/reference/behavior-considered-undefined.html
[issue #82523]: https://github.com/rust-lang/rust/issues/82523

[mario654321]

我也是编译报错，同样的错误

[Kingtous]

rust版本问题吧

[Kingtous]

已升级rustplayer的依赖，目前已正常编译。