Mismatched types on build to i686-pc-windows-msvc

[mars1211]

[patch.crates-io]
egui = { version = "0.21.0", optional = true }
eframe = { version = "0.21.3", optional = true }

Describe the bug
I am building on win 11 x64 for the target i686-pc-windows-msvc, if I don't specify a target, then everything goes fine.

Console output

error[E0308]: mismatched types --> C:\Users\User\.cargo\registry\src\github.com-1ecc6299db9ec823\accesskit_windows-0.12.0\src\subclass.rs:69:67 | 69 | self.prev_wnd_proc = unsafe { transmute::(result) }; | --------------------------- ^^^^^^ expected `isize`, found `i32` | | | arguments to this function are incorrect | note: function defined here --> C:\Users\User\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib/rustlib/src/rust\library\core\src\intrinsics.rs:1255:12 | 1255 | pub fn transmute(src: Src) -> Dst; | ^^^^^^^^^ help: you can convert an `i32` to an `isize` and panic if the converted value doesn't fit | 69 | self.prev_wnd_proc = unsafe { transmute::(result.try_into().unwrap()) }; | ++++++++++++++++++++

error[E0308]: mismatched types
--> C:\Users\User.cargo\registry\src\github.com-1ecc6299db9ec823\accesskit_windows-0.12.0\src\subclass.rs:80:17
|
77 | SetWindowLongPtrW(
| ----------------- arguments to this function are incorrect
...
80 | transmute::<WNDPROC, isize>(self.prev_wnd_proc),
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected i32, found isize
|
note: function defined here
--> C:\Users\User.cargo\registry\src\github.com-1ecc6299db9ec823\windows-0.42.0\src\Windows\Win32\UI\WindowsAndMessaging\mod.rs:4776:15
|
4776 | pub unsafe fn SetWindowLongW<'a, P0>(hwnd: P0, nindex: WINDOW_LONG_PTR_INDEX, dwnewlong: i32) -> i32
| ^^^^^^^^^^^^^^
help: you can convert an isize to an i32 and panic if the converted value doesn't fit
|
80 | transmute::<WNDPROC, isize>(self.prev_wnd_proc).try_into().unwrap(),
| ++++++++++++++++++++

For more information about this error, try rustc --explain E0308.
error: could not compile accesskit_windows due to 2 previous errors
warning: build failed, waiting for other jobs to finish...

[kitsuniru]

fix: disable accesskit feature for eframe in Cargo.toml

[pandarong]

Get the solution by reading the latest source code of accesskit. Manually edit accesskit_windows-0.12.0\src\subclass.rs, add in the file header: #[cfg(any(target_arch = "x86_64", target_arch = "aarch64"))]
type LongPtr = isize;
#[cfg(not(any(target_arch = "x86_64", target_arch = "aarch64")))]
type LongPtr = i32; then replace the isize bit with LongPtr. Compilation succeeded. This should be a problem with the accesskit version, and the egui update related dependencies to the latest should be able to solve it later