Auto merge of #74422 - Manishearth:rollup-7mfrf6g, r=Manishearth

Rollup of 8 pull requests

Successful merges:

 - #73101 (Resolve items for cross-crate imports relative to the original module)
 - #73269 (Enable some timeouts in SGX platform)
 - #74033 (Add build support for Cargo's build-std feature.)
 - #74351 (Do not render unstable items for rustc doc)
 - #74357 (Some `Symbol` related improvements)
 - #74371 (Improve ayu rustdoc theme)
 - #74386 (Add RISC-V GNU/Linux to src/tools/build-manifest as a host platform)
 - #74398 (Clean up E0723 explanation)

Failed merges:

r? @ghost

Author: bors

Cargo.lock

@@ -2056,6 +2056,7 @@ dependencies = [
 name = "panic_abort"
 version = "0.0.0"
 dependencies = [
+ "cfg-if",
  "compiler_builtins",
  "core",
  "libc",
@@ -4552,6 +4553,7 @@ dependencies = [
 name = "test"
 version = "0.0.0"
 dependencies = [
+ "cfg-if",
  "core",
  "getopts",
  "libc",

src/libpanic_abort/Cargo.toml

@@ -11,6 +11,7 @@ bench = false
 doc = false
 
 [dependencies]
+cfg-if = { version = "0.1.8", features = ['rustc-dep-of-std'] }
 core = { path = "../libcore" }
 libc = { version = "0.2", default-features = false }
 compiler_builtins = "0.1.0"

src/libpanic_abort/lib.rs

@@ -40,23 +40,26 @@ pub unsafe extern "C" fn __rust_panic_cleanup(_: *mut u8) -> *mut (dyn Any + Sen
 pub unsafe extern "C" fn __rust_start_panic(_payload: usize) -> u32 {
     abort();
 
-    #[cfg(any(unix, target_os = "cloudabi"))]
-    unsafe fn abort() -> ! {
-        libc::abort();
-    }
-
-    #[cfg(any(windows, all(target_arch = "wasm32", not(target_os = "emscripten"))))]
-    unsafe fn abort() -> ! {
-        core::intrinsics::abort();
-    }
-
-    #[cfg(any(target_os = "hermit", all(target_vendor = "fortanix", target_env = "sgx")))]
-    unsafe fn abort() -> ! {
-        // call std::sys::abort_internal
-        extern "C" {
-            pub fn __rust_abort() -> !;
+    cfg_if::cfg_if! {
+        if #[cfg(any(unix, target_os = "cloudabi"))] {
+            unsafe fn abort() -> ! {
+                libc::abort();
+            }
+        } else if #[cfg(any(target_os = "hermit",
+                            all(target_vendor = "fortanix", target_env = "sgx")
+        ))] {
+            unsafe fn abort() -> ! {
+                // call std::sys::abort_internal
+                extern "C" {
+                    pub fn __rust_abort() -> !;
+                }
+                __rust_abort();
+            }
+        } else {
+            unsafe fn abort() -> ! {
+                core::intrinsics::abort();
+            }
         }
-        __rust_abort();
     }
 }
 

src/libpanic_unwind/lib.rs

@@ -41,21 +41,33 @@ cfg_if::cfg_if! {
     if #[cfg(target_os = "emscripten")] {
         #[path = "emcc.rs"]
         mod real_imp;
-    } else if #[cfg(target_arch = "wasm32")] {
-        #[path = "dummy.rs"]
-        mod real_imp;
     } else if #[cfg(target_os = "hermit")] {
         #[path = "hermit.rs"]
         mod real_imp;
     } else if #[cfg(target_env = "msvc")] {
         #[path = "seh.rs"]
         mod real_imp;
-    } else {
+    } else if #[cfg(any(
+        all(target_family = "windows", target_env = "gnu"),
+        target_os = "cloudabi",
+        target_family = "unix",
+        all(target_vendor = "fortanix", target_env = "sgx"),
+    ))] {
         // Rust runtime's startup objects depend on these symbols, so make them public.
         #[cfg(all(target_os="windows", target_arch = "x86", target_env="gnu"))]
         pub use real_imp::eh_frame_registry::*;
         #[path = "gcc.rs"]
         mod real_imp;
+    } else {
+        // Targets that don't support unwinding.
+        // - arch=wasm32
+        // - os=none ("bare metal" targets)
+        // - os=uefi
+        // - nvptx64-nvidia-cuda
+        // - avr-unknown-unknown
+        // - mipsel-sony-psp
+        #[path = "dummy.rs"]
+        mod real_imp;
     }
 }
 

src/libproc_macro/lib.rs

@@ -26,6 +26,7 @@
 #![feature(in_band_lifetimes)]
 #![feature(negative_impls)]
 #![feature(optin_builtin_traits)]
+#![feature(restricted_std)]
 #![feature(rustc_attrs)]
 #![feature(min_specialization)]
 #![recursion_limit = "256"]

src/librustc_builtin_macros/deriving/bounds.rs

@@ -16,9 +16,9 @@ pub fn expand_deriving_copy(
     let trait_def = TraitDef {
         span,
         attributes: Vec::new(),
-        path: path_std!(cx, marker::Copy),
+        path: path_std!(marker::Copy),
         additional_bounds: Vec::new(),
-        generics: LifetimeBounds::empty(),
+        generics: Bounds::empty(),
         is_unsafe: false,
         supports_unions: true,
         methods: Vec::new(),

src/librustc_builtin_macros/deriving/clone.rs

@@ -56,7 +56,7 @@ pub fn expand_deriving_clone(
                 }
             }
             ItemKind::Union(..) => {
-                bounds = vec![Literal(path_std!(cx, marker::Copy))];
+                bounds = vec![Literal(path_std!(marker::Copy))];
                 is_shallow = true;
                 substructure = combine_substructure(Box::new(|c, s, sub| {
                     cs_clone_shallow("Clone", c, s, sub, true)
@@ -78,14 +78,14 @@ pub fn expand_deriving_clone(
     let trait_def = TraitDef {
         span,
         attributes: Vec::new(),
-        path: path_std!(cx, clone::Clone),
+        path: path_std!(clone::Clone),
         additional_bounds: bounds,
-        generics: LifetimeBounds::empty(),
+        generics: Bounds::empty(),
         is_unsafe: false,
         supports_unions: true,
         methods: vec![MethodDef {
             name: sym::clone,
-            generics: LifetimeBounds::empty(),
+            generics: Bounds::empty(),
             explicit_self: borrowed_explicit_self(),
             args: Vec::new(),
             ret_ty: Self_,

src/librustc_builtin_macros/deriving/cmp/eq.rs

@@ -22,14 +22,14 @@ pub fn expand_deriving_eq(
     let trait_def = TraitDef {
         span,
         attributes: Vec::new(),
-        path: path_std!(cx, cmp::Eq),
+        path: path_std!(cmp::Eq),
         additional_bounds: Vec::new(),
-        generics: LifetimeBounds::empty(),
+        generics: Bounds::empty(),
         is_unsafe: false,
         supports_unions: true,
         methods: vec![MethodDef {
             name: sym::assert_receiver_is_total_eq,
-            generics: LifetimeBounds::empty(),
+            generics: Bounds::empty(),
             explicit_self: borrowed_explicit_self(),
             args: vec![],
             ret_ty: nil_ty(),
@@ -43,13 +43,7 @@ pub fn expand_deriving_eq(
         associated_types: Vec::new(),
     };
 
-    super::inject_impl_of_structural_trait(
-        cx,
-        span,
-        item,
-        path_std!(cx, marker::StructuralEq),
-        push,
-    );
+    super::inject_impl_of_structural_trait(cx, span, item, path_std!(marker::StructuralEq), push);
 
     trait_def.expand_ext(cx, mitem, item, push, true)
 }

src/librustc_builtin_macros/deriving/cmp/ord.rs

@@ -20,17 +20,17 @@ pub fn expand_deriving_ord(
     let trait_def = TraitDef {
         span,
         attributes: Vec::new(),
-        path: path_std!(cx, cmp::Ord),
+        path: path_std!(cmp::Ord),
         additional_bounds: Vec::new(),
-        generics: LifetimeBounds::empty(),
+        generics: Bounds::empty(),
         is_unsafe: false,
         supports_unions: false,
         methods: vec![MethodDef {
             name: sym::cmp,
-            generics: LifetimeBounds::empty(),
+            generics: Bounds::empty(),
             explicit_self: borrowed_explicit_self(),
-            args: vec![(borrowed_self(), "other")],
-            ret_ty: Literal(path_std!(cx, cmp::Ordering)),
+            args: vec![(borrowed_self(), sym::other)],
+            ret_ty: Literal(path_std!(cmp::Ordering)),
             attributes: attrs,
             is_unsafe: false,
             unify_fieldless_variants: true,

src/librustc_builtin_macros/deriving/cmp/partial_eq.rs

@@ -69,9 +69,9 @@ pub fn expand_deriving_partial_eq(
             let attrs = vec![cx.attribute(inline)];
             MethodDef {
                 name: $name,
-                generics: LifetimeBounds::empty(),
+                generics: Bounds::empty(),
                 explicit_self: borrowed_explicit_self(),
-                args: vec![(borrowed_self(), "other")],
+                args: vec![(borrowed_self(), sym::other)],
                 ret_ty: Literal(path_local!(bool)),
                 attributes: attrs,
                 is_unsafe: false,
@@ -85,7 +85,7 @@ pub fn expand_deriving_partial_eq(
         cx,
         span,
         item,
-        path_std!(cx, marker::StructuralPartialEq),
+        path_std!(marker::StructuralPartialEq),
         push,
     );
 
@@ -100,9 +100,9 @@ pub fn expand_deriving_partial_eq(
     let trait_def = TraitDef {
         span,
         attributes: Vec::new(),
-        path: path_std!(cx, cmp::PartialEq),
+        path: path_std!(cmp::PartialEq),
         additional_bounds: Vec::new(),
-        generics: LifetimeBounds::empty(),
+        generics: Bounds::empty(),
         is_unsafe: false,
         supports_unions: false,
         methods,