Rollup merge of rust-lang#117556 - obeis:static-mut-ref-lint, r=davidtwco

Disallow reference to `static mut` and adding `static_mut_ref` lint

Closes rust-lang#114447

r? `@scottmcm`

Author: GuillaumeGomez

panic_unwind/src/seh.rs

@@ -261,6 +261,8 @@ cfg_if::cfg_if! {
    }
 }
 
+// FIXME: Use `SyncUnsafeCell` instead of allowing `static_mut_ref` lint
+#[cfg_attr(not(bootstrap), allow(static_mut_ref))]
 pub unsafe fn panic(data: Box<dyn Any + Send>) -> u32 {
     use core::intrinsics::atomic_store_seqcst;
 
@@ -322,6 +324,8 @@ pub unsafe fn panic(data: Box<dyn Any + Send>) -> u32 {
     _CxxThrowException(throw_ptr, &mut THROW_INFO as *mut _ as *mut _);
 }
 
+// FIXME: Use `SyncUnsafeCell` instead of allowing `static_mut_ref` lint
+#[cfg_attr(not(bootstrap), allow(static_mut_ref))]
 pub unsafe fn cleanup(payload: *mut u8) -> Box<dyn Any + Send> {
     // A null payload here means that we got here from the catch (...) of
     // __rust_try. This happens when a non-Rust foreign exception is caught.

std/src/panicking.rs

@@ -337,6 +337,8 @@ pub mod panic_count {
 #[doc(hidden)]
 #[cfg(not(feature = "panic_immediate_abort"))]
 #[unstable(feature = "update_panic_count", issue = "none")]
+// FIXME: Use `SyncUnsafeCell` instead of allowing `static_mut_ref` lint
+#[cfg_attr(not(bootstrap), allow(static_mut_ref))]
 pub mod panic_count {
     use crate::cell::Cell;
     use crate::sync::atomic::{AtomicUsize, Ordering};

std/src/sys/common/thread_local/fast_local.rs

@@ -13,6 +13,8 @@ pub macro thread_local_inner {
     (@key $t:ty, const $init:expr) => {{
         #[inline]
         #[deny(unsafe_op_in_unsafe_fn)]
+        // FIXME: Use `SyncUnsafeCell` instead of allowing `static_mut_ref` lint
+        #[cfg_attr(not(bootstrap), allow(static_mut_ref))]
         unsafe fn __getit(
             _init: $crate::option::Option<&mut $crate::option::Option<$t>>,
         ) -> $crate::option::Option<&'static $t> {

std/src/sys/common/thread_local/static_local.rs

@@ -11,6 +11,8 @@ pub macro thread_local_inner {
     (@key $t:ty, const $init:expr) => {{
         #[inline] // see comments below
         #[deny(unsafe_op_in_unsafe_fn)]
+        // FIXME: Use `SyncUnsafeCell` instead of allowing `static_mut_ref` lint
+        #[cfg_attr(not(bootstrap), allow(static_mut_ref))]
         unsafe fn __getit(
             _init: $crate::option::Option<&mut $crate::option::Option<$t>>,
         ) -> $crate::option::Option<&'static $t> {

std/src/thread/local.rs

@@ -180,6 +180,8 @@ impl<T: 'static> fmt::Debug for LocalKey<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 #[cfg_attr(not(test), rustc_diagnostic_item = "thread_local_macro")]
 #[allow_internal_unstable(thread_local_internals)]
+// FIXME: Use `SyncUnsafeCell` instead of allowing `static_mut_ref` lint
+#[cfg_attr(not(bootstrap), allow(static_mut_ref))]
 macro_rules! thread_local {
     // empty (base case for the recursion)
     () => {};