Auto merge of #105741 - pietroalbini:pa-1.68-nightly, r=Mark-Simulacrum

Bump master bootstrap compiler

This PR bumps the bootstrap compiler to the beta created earlier this week, cherry-picks the stabilization version number updates, and updates the `cfg(bootstrap)`s.

r? `@Mark-Simulacrum`

library/std/src/prelude/v1.rs

@@ -59,14 +59,12 @@ pub use core::prelude::v1::{RustcDecodable, RustcEncodable};
 
 // Do not `doc(no_inline)` so that they become doc items on their own
 // (no public module for them to be re-exported from).
-#[cfg(not(bootstrap))]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
-pub use core::prelude::v1::alloc_error_handler;
-#[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
-pub use core::prelude::v1::{bench, derive, global_allocator, test, test_case};
+pub use core::prelude::v1::{
+    alloc_error_handler, bench, derive, global_allocator, test, test_case,
+};
 
 #[unstable(feature = "derive_const", issue = "none")]
-#[cfg(not(bootstrap))]
 pub use core::prelude::v1::derive_const;
 
 // Do not `doc(no_inline)` either.
@@ -91,7 +89,6 @@ pub use core::prelude::v1::cfg_eval;
     issue = "23416",
     reason = "placeholder syntax for type ascription"
 )]
-#[cfg(not(bootstrap))]
 pub use core::prelude::v1::type_ascribe;
 
 // The file so far is equivalent to src/libcore/prelude/v1.rs,

library/std/src/process.rs

@@ -2164,18 +2164,11 @@ pub fn id() -> u32 {
 /// to provide similar functionality.
 #[cfg_attr(not(test), lang = "termination")]
 #[stable(feature = "termination_trait_lib", since = "1.61.0")]
-#[rustc_on_unimplemented(
-    on(
-        all(not(bootstrap), cause = "MainFunctionType"),
-        message = "`main` has invalid return type `{Self}`",
-        label = "`main` can only return types that implement `{Termination}`"
-    ),
-    on(
-        bootstrap,
-        message = "`main` has invalid return type `{Self}`",
-        label = "`main` can only return types that implement `{Termination}`"
-    )
-)]
+#[rustc_on_unimplemented(on(
+    cause = "MainFunctionType",
+    message = "`main` has invalid return type `{Self}`",
+    label = "`main` can only return types that implement `{Termination}`"
+))]
 pub trait Termination {
     /// Is called to get the representation of the value as status code.
     /// This status code is returned to the operating system.

library/std/src/sys/unix/mod.rs

@@ -184,12 +184,7 @@ pub unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) {
                 sigpipe::SIG_DFL => (true, Some(libc::SIG_DFL)),
                 _ => unreachable!(),
             };
-            // The bootstrap compiler doesn't know about sigpipe::DEFAULT, and always passes in
-            // SIG_IGN. This causes some tests to fail because they expect SIGPIPE to be reset to
-            // default on process spawning (which doesn't happen if #[unix_sigpipe] is specified).
-            // Since we can't differentiate between the cases here, treat SIG_IGN as DEFAULT
-            // unconditionally.
-            if sigpipe_attr_specified && !(cfg!(bootstrap) && sigpipe == sigpipe::SIG_IGN) {
+            if sigpipe_attr_specified {
                 UNIX_SIGPIPE_ATTR_SPECIFIED.store(true, crate::sync::atomic::Ordering::Relaxed);
             }
             if let Some(handler) = handler {

library/std/src/sys/unix/weak.rs

@@ -29,7 +29,7 @@ use crate::ptr;
 use crate::sync::atomic::{self, AtomicPtr, Ordering};
 
 // We can use true weak linkage on ELF targets.
-#[cfg(all(not(any(target_os = "macos", target_os = "ios")), not(bootstrap)))]
+#[cfg(not(any(target_os = "macos", target_os = "ios")))]
 pub(crate) macro weak {
     (fn $name:ident($($t:ty),*) -> $ret:ty) => (
         let ref $name: ExternWeak<unsafe extern "C" fn($($t),*) -> $ret> = {
@@ -43,30 +43,14 @@ pub(crate) macro weak {
     )
 }
 
-#[cfg(all(not(any(target_os = "macos", target_os = "ios")), bootstrap))]
-pub(crate) macro weak {
-    (fn $name:ident($($t:ty),*) -> $ret:ty) => (
-        let ref $name: ExternWeak<unsafe extern "C" fn($($t),*) -> $ret> = {
-            extern "C" {
-                #[linkage = "extern_weak"]
-                static $name: *const libc::c_void;
-            }
-            #[allow(unused_unsafe)]
-            ExternWeak::new(unsafe { $name })
-        };
-    )
-}
-
 // On non-ELF targets, use the dlsym approximation of weak linkage.
 #[cfg(any(target_os = "macos", target_os = "ios"))]
 pub(crate) use self::dlsym as weak;
 
-#[cfg(not(bootstrap))]
 pub(crate) struct ExternWeak<F: Copy> {
     weak_ptr: Option<F>,
 }
 
-#[cfg(not(bootstrap))]
 impl<F: Copy> ExternWeak<F> {
     #[inline]
     pub(crate) fn new(weak_ptr: Option<F>) -> Self {
@@ -79,34 +63,6 @@ impl<F: Copy> ExternWeak<F> {
     }
 }
 
-#[cfg(bootstrap)]
-pub(crate) struct ExternWeak<F> {
-    weak_ptr: *const libc::c_void,
-    _marker: PhantomData<F>,
-}
-
-#[cfg(bootstrap)]
-impl<F> ExternWeak<F> {
-    #[inline]
-    pub(crate) fn new(weak_ptr: *const libc::c_void) -> Self {
-        ExternWeak { weak_ptr, _marker: PhantomData }
-    }
-}
-
-#[cfg(bootstrap)]
-impl<F> ExternWeak<F> {
-    #[inline]
-    pub(crate) fn get(&self) -> Option<F> {
-        unsafe {
-            if self.weak_ptr.is_null() {
-                None
-            } else {
-                Some(mem::transmute_copy::<*const libc::c_void, F>(&self.weak_ptr))
-            }
-        }
-    }
-}
-
 pub(crate) macro dlsym {
     (fn $name:ident($($t:ty),*) -> $ret:ty) => (
          dlsym!(fn $name($($t),*) -> $ret, stringify!($name));