Auto merge of #146892 - GuillaumeGomez:rollup-fa7lp0n, r=GuillaumeGomez

Rollup of 5 pull requests

Successful merges:

 - rust-lang/rust#146795 (Enable `limit_rdylib_exports` on wasm targets)
 - rust-lang/rust#146828 (fix a crash in rustdoc merge finalize without input file)
 - rust-lang/rust#146848 (Add x86_64-unknown-motor (Motor OS) tier 3 target)
 - rust-lang/rust#146884 (Fix modification check of `rustdoc-json-types`)
 - rust-lang/rust#146887 (Remove unused #![feature(get_mut_unchecked)] in Rc and Arc examples)

r? `@ghost`
`@rustbot` modify labels: rollup

18 files changed, 173 insertions, 30 deletions

diff --git a/compiler/rustc_codegen_ssa/src/back/linker.rs b/compiler/rustc_codegen_ssa/src/back/linker.rs
index a2efd420a32..b90be2faa08 100644
--- a/compiler/rustc_codegen_ssa/src/back/linker.rs
+++ b/compiler/rustc_codegen_ssa/src/back/linker.rs
@@ -845,6 +845,11 @@ impl<'a> Linker for GccLinker<'a> {
                 self.sess.dcx().emit_fatal(errors::VersionScriptWriteFailure { error });
             }
             self.link_arg("--dynamic-list").link_arg(path);
+        } else if self.sess.target.is_like_wasm {
+            self.link_arg("--no-export-dynamic");
+            for (sym, _) in symbols {
+                self.link_arg("--export").link_arg(sym);
+            }
         } else {
             // Write an LD version script
             let res: io::Result<()> = try {
diff --git a/compiler/rustc_target/src/spec/base/mod.rs b/compiler/rustc_target/src/spec/base/mod.rs
index be15da7329d..6ab8597a4ec 100644
--- a/compiler/rustc_target/src/spec/base/mod.rs
+++ b/compiler/rustc_target/src/spec/base/mod.rs
@@ -21,6 +21,7 @@ pub(crate) mod linux_uclibc;
 pub(crate) mod linux_wasm;
 pub(crate) mod lynxos178;
 pub(crate) mod managarm_mlibc;
+pub(crate) mod motor;
 pub(crate) mod msvc;
 pub(crate) mod netbsd;
 pub(crate) mod nto_qnx;
diff --git a/compiler/rustc_target/src/spec/base/motor.rs b/compiler/rustc_target/src/spec/base/motor.rs
new file mode 100644
index 00000000000..18485b2cef2
--- /dev/null
+++ b/compiler/rustc_target/src/spec/base/motor.rs
@@ -0,0 +1,34 @@
+use crate::spec::{
+    Cc, FramePointer, LinkerFlavor, Lld, PanicStrategy, StackProbeType, TargetOptions,
+};
+
+pub(crate) fn opts() -> TargetOptions {
+    let pre_link_args = TargetOptions::link_args(
+        LinkerFlavor::Gnu(Cc::No, Lld::No),
+        &[
+            "-e",
+            "motor_start",
+            "--no-undefined",
+            "--error-unresolved-symbols",
+            "--no-undefined-version",
+            "-u",
+            "__rust_abort",
+        ],
+    );
+    TargetOptions {
+        os: "motor".into(),
+        executables: true,
+        // TLS is false below because if true, the compiler assumes
+        // we handle TLS at the ELF loading level, which we don't.
+        // We use "OS level" TLS (see thread/local.rs in stdlib).
+        has_thread_local: false,
+        frame_pointer: FramePointer::NonLeaf,
+        linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::No),
+        main_needs_argc_argv: true,
+        panic_strategy: PanicStrategy::Abort,
+        pre_link_args,
+        stack_probes: StackProbeType::Inline,
+        supports_stack_protector: true,
+        ..Default::default()
+    }
+}
diff --git a/compiler/rustc_target/src/spec/base/wasm.rs b/compiler/rustc_target/src/spec/base/wasm.rs
index 88e7af5e669..7ede45766ea 100644
--- a/compiler/rustc_target/src/spec/base/wasm.rs
+++ b/compiler/rustc_target/src/spec/base/wasm.rs
@@ -81,11 +81,6 @@ pub(crate) fn options() -> TargetOptions {
         // threaded model which will legalize atomics to normal operations.
         singlethread: true,
 
-        // Symbol visibility takes care of this for the WebAssembly.
-        // Additionally the only known linker, LLD, doesn't support the script
-        // arguments just yet
-        limit_rdylib_exports: false,
-
         // we use the LLD shipped with the Rust toolchain by default
         linker: Some("rust-lld".into()),
         linker_flavor: LinkerFlavor::WasmLld(Cc::No),
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index f705af52bd8..c40358af593 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -1642,6 +1642,7 @@ supported_targets! {
     ("aarch64-unknown-hermit", aarch64_unknown_hermit),
     ("riscv64gc-unknown-hermit", riscv64gc_unknown_hermit),
     ("x86_64-unknown-hermit", x86_64_unknown_hermit),
+    ("x86_64-unknown-motor", x86_64_unknown_motor),
 
     ("x86_64-unikraft-linux-musl", x86_64_unikraft_linux_musl),
 
diff --git a/compiler/rustc_target/src/spec/targets/x86_64_unknown_motor.rs b/compiler/rustc_target/src/spec/targets/x86_64_unknown_motor.rs
new file mode 100644
index 00000000000..0fd43357a76
--- /dev/null
+++ b/compiler/rustc_target/src/spec/targets/x86_64_unknown_motor.rs
@@ -0,0 +1,38 @@
+use crate::spec::{
+    CodeModel, LinkSelfContainedDefault, LldFlavor, RelocModel, RelroLevel, Target, base,
+};
+
+pub(crate) fn target() -> Target {
+    let mut base = base::motor::opts();
+    base.cpu = "x86-64".into();
+    base.max_atomic_width = Some(64);
+    base.code_model = Some(CodeModel::Small);
+
+    // We want fully static relocatable binaries. It was surprisingly
+    // difficult to make it happen reliably, especially various
+    // linker-related options below. Mostly trial and error.
+    base.position_independent_executables = true;
+    base.relro_level = RelroLevel::Full;
+    base.static_position_independent_executables = true;
+    base.relocation_model = RelocModel::Pic;
+    base.lld_flavor_json = LldFlavor::Ld;
+    base.link_self_contained = LinkSelfContainedDefault::True;
+    base.dynamic_linking = false;
+    base.crt_static_default = true;
+    base.crt_static_respected = true;
+
+    Target {
+        llvm_target: "x86_64-unknown-none-elf".into(),
+        metadata: crate::spec::TargetMetadata {
+            description: Some("Motor OS".into()),
+            tier: Some(3),
+            host_tools: None,
+            std: None,
+        },
+        pointer_width: 64,
+        data_layout:
+            "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128".into(),
+        arch: "x86_64".into(),
+        options: base,
+    }
+}
diff --git a/library/alloc/src/rc.rs b/library/alloc/src/rc.rs
index fcb466778a3..aed3357afbf 100644
--- a/library/alloc/src/rc.rs
+++ b/library/alloc/src/rc.rs
@@ -480,8 +480,6 @@ impl<T> Rc<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(get_mut_unchecked)]
-    ///
     /// use std::rc::Rc;
     ///
     /// let mut five = Rc::<u32>::new_uninit();
@@ -572,7 +570,6 @@ impl<T> Rc<T> {
     ///
     /// ```
     /// #![feature(allocator_api)]
-    /// #![feature(get_mut_unchecked)]
     ///
     /// use std::rc::Rc;
     ///
@@ -1014,8 +1011,6 @@ impl<T> Rc<[T]> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(get_mut_unchecked)]
-    ///
     /// use std::rc::Rc;
     ///
     /// let mut values = Rc::<[u32]>::new_uninit_slice(3);
@@ -1181,8 +1176,6 @@ impl<T, A: Allocator> Rc<mem::MaybeUninit<T>, A> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(get_mut_unchecked)]
-    ///
     /// use std::rc::Rc;
     ///
     /// let mut five = Rc::<u32>::new_uninit();
@@ -1218,8 +1211,6 @@ impl<T, A: Allocator> Rc<[mem::MaybeUninit<T>], A> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(get_mut_unchecked)]
-    ///
     /// use std::rc::Rc;
     ///
     /// let mut values = Rc::<[u32]>::new_uninit_slice(3);
diff --git a/library/alloc/src/sync.rs b/library/alloc/src/sync.rs
index 32396cccb8f..a466b74944c 100644
--- a/library/alloc/src/sync.rs
+++ b/library/alloc/src/sync.rs
@@ -480,8 +480,6 @@ impl<T> Arc<T> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(get_mut_unchecked)]
-    ///
     /// use std::sync::Arc;
     ///
     /// let mut five = Arc::<u32>::new_uninit();
@@ -586,7 +584,6 @@ impl<T> Arc<T> {
     ///
     /// ```
     /// #![feature(allocator_api)]
-    /// #![feature(get_mut_unchecked)]
     ///
     /// use std::sync::Arc;
     ///
@@ -1156,8 +1153,6 @@ impl<T> Arc<[T]> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(get_mut_unchecked)]
-    ///
     /// use std::sync::Arc;
     ///
     /// let mut values = Arc::<[u32]>::new_uninit_slice(3);
@@ -1326,8 +1321,6 @@ impl<T, A: Allocator> Arc<mem::MaybeUninit<T>, A> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(get_mut_unchecked)]
-    ///
     /// use std::sync::Arc;
     ///
     /// let mut five = Arc::<u32>::new_uninit();
@@ -1364,8 +1357,6 @@ impl<T, A: Allocator> Arc<[mem::MaybeUninit<T>], A> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(get_mut_unchecked)]
-    ///
     /// use std::sync::Arc;
     ///
     /// let mut values = Arc::<[u32]>::new_uninit_slice(3);
diff --git a/src/bootstrap/src/core/sanity.rs b/src/bootstrap/src/core/sanity.rs
index 68202500d97..91d80c96e42 100644
--- a/src/bootstrap/src/core/sanity.rs
+++ b/src/bootstrap/src/core/sanity.rs
@@ -38,6 +38,7 @@ const STAGE0_MISSING_TARGETS: &[&str] = &[
     // just a dummy comment so the list doesn't get onelined
     "aarch64_be-unknown-hermit",
     "aarch64_be-unknown-none-softfloat",
+    "x86_64-unknown-motor",
 ];
 
 /// Minimum version threshold for libstdc++ required when using prebuilt LLVM
@@ -239,6 +240,10 @@ than building it.
             continue;
         }
 
+        if target.contains("motor") {
+            continue;
+        }
+
         // skip check for cross-targets
         if skip_target_sanity && target != &build.host_target {
             continue;
diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
index e5e46f72637..99c8e365f5c 100644
--- a/src/doc/rustc/src/platform-support.md
+++ b/src/doc/rustc/src/platform-support.md
@@ -431,6 +431,7 @@ target | std | host | notes
 `x86_64-unknown-l4re-uclibc` | ? |  |
 [`x86_64-unknown-linux-none`](platform-support/x86_64-unknown-linux-none.md) | * |  | 64-bit Linux with no libc
 [`x86_64-unknown-managarm-mlibc`](platform-support/managarm.md) | ? |   | x86_64 Managarm
+[`x86_64-unknown-motor`[(platform-support/motor.md) | ? |  | x86_64 Motor OS
 [`x86_64-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | 64-bit OpenBSD
 [`x86_64-unknown-trusty`](platform-support/trusty.md) | ✓ |  |
 `x86_64-uwp-windows-gnu` | ✓ |  |
diff --git a/src/doc/rustc/src/platform-support/motor.md b/src/doc/rustc/src/platform-support/motor.md
new file mode 100644
index 00000000000..e7aa7b23f3a
--- /dev/null
+++ b/src/doc/rustc/src/platform-support/motor.md
@@ -0,0 +1,45 @@
+# `x86_64-unknown-motor`
+
+**Tier: 3**
+
+[Motor OS](https://github.com/moturus/motor-os) is a new operating system
+for virtualized environments.
+
+## Target maintainers
+
+[@lasiotus](https://github.com/lasiotus)
+
+## Requirements
+
+This target is cross-compiled. There are no special requirements for the host.
+
+Motor OS uses the ELF file format.
+
+## Building the target
+
+The target can be built by enabling it for a `rustc` build, for example:
+
+```toml
+[build]
+build-stage = 2
+target = ["x86_64-unknown-motor"]
+```
+
+## Building Rust programs
+
+Rust standard library is fully supported/implemented, but is not yet part of
+the official Rust repo, so an out-of-tree building process should be
+followed, as described in the
+[build doc](https://github.com/moturus/motor-os/blob/main/docs/build.md).
+
+## Testing
+
+Cross-compiled Rust binaries and test artifacts can be executed in Motor OS VMs,
+as described in e.g.
+[Hello Motor OS](https://github.com/moturus/motor-os/blob/main/docs/recipes/hello-motor-os.md)
+example.
+
+## Cross-compilation toolchains and C code
+
+C code can be compiled as part of Rust cargo projects. However, there is
+no libc support.
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 0ff1c090689..5d8f8f4bed1 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -836,8 +836,10 @@ fn main_args(early_dcx: &mut EarlyDiagCtxt, at_args: &[String]) {
         config::InputMode::NoInputMergeFinalize => {
             return wrap_return(
                 dcx,
-                run_merge_finalize(render_options)
-                    .map_err(|e| format!("could not write merged cross-crate info: {e}")),
+                rustc_span::create_session_globals_then(options.edition, &[], None, || {
+                    run_merge_finalize(render_options)
+                        .map_err(|e| format!("could not write merged cross-crate info: {e}"))
+                }),
             );
         }
     };
diff --git a/src/tools/tidy/src/rustdoc_json.rs b/src/tools/tidy/src/rustdoc_json.rs
index 7a53c08737f..ade774616c7 100644
--- a/src/tools/tidy/src/rustdoc_json.rs
+++ b/src/tools/tidy/src/rustdoc_json.rs
@@ -17,11 +17,13 @@ pub fn check(src_path: &Path, ci_info: &crate::CiInfo, diag_ctx: DiagCtx) {
     };
 
     // First we check that `src/rustdoc-json-types` was modified.
-    if !crate::files_modified(ci_info, |p| p == RUSTDOC_JSON_TYPES) {
+    if !crate::files_modified(ci_info, |p| p.starts_with(RUSTDOC_JSON_TYPES)) {
         // `rustdoc-json-types` was not modified so nothing more to check here.
-        check.verbose_msg("`rustdoc-json-types` was not modified.");
         return;
     }
+
+    check.message("`rustdoc-json-types` modified, checking format version");
+
     // Then we check that if `FORMAT_VERSION` was updated, the `Latest feature:` was also updated.
     match crate::git_diff(base_commit, src_path.join("rustdoc-json-types")) {
         Some(output) => {
diff --git a/tests/assembly-llvm/targets/targets-elf.rs b/tests/assembly-llvm/targets/targets-elf.rs
index b5c116cdfef..ebea9fe40f5 100644
--- a/tests/assembly-llvm/targets/targets-elf.rs
+++ b/tests/assembly-llvm/targets/targets-elf.rs
@@ -658,6 +658,9 @@
 //@ revisions: x86_64_unknown_managarm_mlibc
 //@ [x86_64_unknown_managarm_mlibc] compile-flags: --target x86_64-unknown-managarm-mlibc
 //@ [x86_64_unknown_managarm_mlibc] needs-llvm-components: x86
+//@ revisions: x86_64_unknown_motor
+//@ [x86_64_unknown_motor] compile-flags: --target x86_64-unknown-motor
+//@ [x86_64_unknown_motor] needs-llvm-components: x86
 //@ revisions: x86_64_unknown_netbsd
 //@ [x86_64_unknown_netbsd] compile-flags: --target x86_64-unknown-netbsd
 //@ [x86_64_unknown_netbsd] needs-llvm-components: x86
diff --git a/tests/run-make/rustdoc-merge-no-input-finalize/rmake.rs b/tests/run-make/rustdoc-merge-no-input-finalize/rmake.rs
new file mode 100644
index 00000000000..0b1e1948d5f
--- /dev/null
+++ b/tests/run-make/rustdoc-merge-no-input-finalize/rmake.rs
@@ -0,0 +1,28 @@
+// Running --merge=finalize without an input crate root should not trigger ICE.
+// Issue: https://github.com/rust-lang/rust/issues/146646
+
+//@ needs-target-std
+
+use run_make_support::{path, rustdoc};
+
+fn main() {
+    let out_dir = path("out");
+    let merged_dir = path("merged");
+    let parts_out_dir = path("parts");
+    rustdoc()
+        .input("sierra.rs")
+        .out_dir(&out_dir)
+        .arg("-Zunstable-options")
+        .arg(format!("--parts-out-dir={}", parts_out_dir.display()))
+        .arg("--merge=none")
+        .run();
+    assert!(parts_out_dir.join("crate-info").exists());
+
+    let output = rustdoc()
+        .arg("-Zunstable-options")
+        .out_dir(&out_dir)
+        .arg(format!("--include-parts-dir={}", parts_out_dir.display()))
+        .arg("--merge=finalize")
+        .run();
+    output.assert_stderr_not_contains("error: the compiler unexpectedly panicked. this is a bug.");
+}
diff --git a/tests/run-make/rustdoc-merge-no-input-finalize/sierra.rs b/tests/run-make/rustdoc-merge-no-input-finalize/sierra.rs
new file mode 100644
index 00000000000..f8fc48341ed
--- /dev/null
+++ b/tests/run-make/rustdoc-merge-no-input-finalize/sierra.rs
@@ -0,0 +1 @@
+pub struct Sierra;
diff --git a/tests/ui/check-cfg/cfg-crate-features.stderr b/tests/ui/check-cfg/cfg-crate-features.stderr
index 6b2e628e12e..39fee52a909 100644
--- a/tests/ui/check-cfg/cfg-crate-features.stderr
+++ b/tests/ui/check-cfg/cfg-crate-features.stderr
@@ -24,7 +24,7 @@ warning: unexpected `cfg` condition value: `does_not_exist`
 LL | #![cfg(not(target(os = "does_not_exist")))]
    |                   ^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: expected values for `target_os` are: `aix`, `amdhsa`, `android`, `cuda`, `cygwin`, `dragonfly`, `emscripten`, `espidf`, `freebsd`, `fuchsia`, `haiku`, `hermit`, `horizon`, `hurd`, `illumos`, `ios`, `l4re`, `linux`, `lynxos178`, `macos`, `managarm`, `netbsd`, `none`, `nto`, `nuttx`, `openbsd`, `psp`, `psx`, `redox`, `rtems`, `solaris`, `solid_asp3`, `teeos`, `trusty`, and `tvos` and 11 more
+   = note: expected values for `target_os` are: `aix`, `amdhsa`, `android`, `cuda`, `cygwin`, `dragonfly`, `emscripten`, `espidf`, `freebsd`, `fuchsia`, `haiku`, `hermit`, `horizon`, `hurd`, `illumos`, `ios`, `l4re`, `linux`, `lynxos178`, `macos`, `managarm`, `motor`, `netbsd`, `none`, `nto`, `nuttx`, `openbsd`, `psp`, `psx`, `redox`, `rtems`, `solaris`, `solid_asp3`, `teeos`, and `trusty` and 12 more
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
    = note: `#[warn(unexpected_cfgs)]` on by default
 
diff --git a/tests/ui/check-cfg/well-known-values.stderr b/tests/ui/check-cfg/well-known-values.stderr
index 6490fc63fd7..df2357696a3 100644
--- a/tests/ui/check-cfg/well-known-values.stderr
+++ b/tests/ui/check-cfg/well-known-values.stderr
@@ -201,7 +201,7 @@ warning: unexpected `cfg` condition value: `_UNEXPECTED_VALUE`
 LL |     target_os = "_UNEXPECTED_VALUE",
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: expected values for `target_os` are: `aix`, `amdhsa`, `android`, `cuda`, `cygwin`, `dragonfly`, `emscripten`, `espidf`, `freebsd`, `fuchsia`, `haiku`, `hermit`, `horizon`, `hurd`, `illumos`, `ios`, `l4re`, `linux`, `lynxos178`, `macos`, `managarm`, `netbsd`, `none`, `nto`, `nuttx`, `openbsd`, `psp`, `psx`, `redox`, `rtems`, `solaris`, `solid_asp3`, `teeos`, `trusty`, `tvos`, `uefi`, `unknown`, `vexos`, `visionos`, `vita`, `vxworks`, `wasi`, `watchos`, `windows`, `xous`, and `zkvm`
+   = note: expected values for `target_os` are: `aix`, `amdhsa`, `android`, `cuda`, `cygwin`, `dragonfly`, `emscripten`, `espidf`, `freebsd`, `fuchsia`, `haiku`, `hermit`, `horizon`, `hurd`, `illumos`, `ios`, `l4re`, `linux`, `lynxos178`, `macos`, `managarm`, `motor`, `netbsd`, `none`, `nto`, `nuttx`, `openbsd`, `psp`, `psx`, `redox`, `rtems`, `solaris`, `solid_asp3`, `teeos`, `trusty`, `tvos`, `uefi`, `unknown`, `vexos`, `visionos`, `vita`, `vxworks`, `wasi`, `watchos`, `windows`, `xous`, and `zkvm`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition value: `_UNEXPECTED_VALUE`
@@ -274,7 +274,7 @@ LL | #[cfg(target_os = "linuz")] // testing that we suggest `linux`
    |                   |
    |                   help: there is a expected value with a similar name: `"linux"`
    |
-   = note: expected values for `target_os` are: `aix`, `amdhsa`, `android`, `cuda`, `cygwin`, `dragonfly`, `emscripten`, `espidf`, `freebsd`, `fuchsia`, `haiku`, `hermit`, `horizon`, `hurd`, `illumos`, `ios`, `l4re`, `linux`, `lynxos178`, `macos`, `managarm`, `netbsd`, `none`, `nto`, `nuttx`, `openbsd`, `psp`, `psx`, `redox`, `rtems`, `solaris`, `solid_asp3`, `teeos`, `trusty`, `tvos`, `uefi`, `unknown`, `vexos`, `visionos`, `vita`, `vxworks`, `wasi`, `watchos`, `windows`, `xous`, and `zkvm`
+   = note: expected values for `target_os` are: `aix`, `amdhsa`, `android`, `cuda`, `cygwin`, `dragonfly`, `emscripten`, `espidf`, `freebsd`, `fuchsia`, `haiku`, `hermit`, `horizon`, `hurd`, `illumos`, `ios`, `l4re`, `linux`, `lynxos178`, `macos`, `managarm`, `motor`, `netbsd`, `none`, `nto`, `nuttx`, `openbsd`, `psp`, `psx`, `redox`, `rtems`, `solaris`, `solid_asp3`, `teeos`, `trusty`, `tvos`, `uefi`, `unknown`, `vexos`, `visionos`, `vita`, `vxworks`, `wasi`, `watchos`, `windows`, `xous`, and `zkvm`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: 28 warnings emitted