rust/bindings: allow unnecessary_transmutes (1.88)

This is a new lint introduced in Rust 1.88. It does not affect
compilation when using a previous version or our MSRV, 1.77. But with
1.88 compilation fails because we deny all warnings:

  error: unnecessary transmute
     --> rust/qemu-api/libqemu_api.rlib.p/structured/bindings.inc.rs:729:18
      |
  729 |         unsafe { ::std::mem::transmute(self._bitfield_1.get(0usize, 24u8) as u32) }
      |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace this with: `u32::cast_signed(self._bitfield_1.get(0usize, 24u8) as u32)`
      |
      = note: `-D unnecessary-transmutes` implied by `-D warnings`
      = help: to override `-D warnings` add `#[allow(unnecessary_transmutes)]`

Allow this lint, which even though it does not exist in previous
versions, it works because we allow for `unknown_lints` in
rust/Cargo.toml.

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/r/20250703-rust_bindings_allow_unnecessary_transmutes-v1-1-692ca210d331@linaro.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/rust/qemu-api/src/bindings.rs b/rust/qemu-api/src/bindings.rs
index 057de4b6467c50ecc5acb6b51e6fde87ef5fa67f..3cdad0f0ec640880bc74a942bbcb303be4cda775 100644 (file)
--- a/rust/qemu-api/src/bindings.rs
+++ b/rust/qemu-api/src/bindings.rs
@@ -6,6 +6,7 @@
     non_camel_case_types,
     non_snake_case,
     non_upper_case_globals,
+    unnecessary_transmutes,
     unsafe_op_in_unsafe_fn,
     clippy::pedantic,
     clippy::restriction,