Remove or cfg out unused features in library

Author: mu001999

library/alloc/src/lib.rs

@@ -85,14 +85,12 @@
 //
 // Library features:
 // tidy-alphabetical-start
-#![cfg_attr(not(no_global_oom_handling), feature(string_replace_in_place))]
+#![cfg_attr(test, feature(assert_matches))]
 #![feature(allocator_api)]
 #![feature(array_into_iter_constructors)]
 #![feature(ascii_char)]
-#![feature(assert_matches)]
 #![feature(async_fn_traits)]
 #![feature(async_iterator)]
-#![feature(box_vec_non_null)]
 #![feature(bstr)]
 #![feature(bstr_internals)]
 #![feature(cast_maybe_uninit)]
@@ -149,7 +147,6 @@
 #![feature(slice_ptr_get)]
 #![feature(slice_range)]
 #![feature(std_internals)]
-#![feature(str_internals)]
 #![feature(temporary_niche_types)]
 #![feature(transmutability)]
 #![feature(trivial_clone)]
@@ -159,7 +156,6 @@
 #![feature(try_blocks)]
 #![feature(try_trait_v2)]
 #![feature(try_trait_v2_residual)]
-#![feature(try_with_capacity)]
 #![feature(tuple_trait)]
 #![feature(ub_checks)]
 #![feature(unicode_internals)]
@@ -177,10 +173,8 @@
 #![feature(const_trait_impl)]
 #![feature(coroutine_trait)]
 #![feature(decl_macro)]
-#![feature(derive_const)]
 #![feature(dropck_eyepatch)]
 #![feature(fundamental)]
-#![feature(hashmap_internals)]
 #![feature(intrinsics)]
 #![feature(lang_items)]
 #![feature(min_specialization)]
@@ -206,7 +200,7 @@
 // blocks is for `&[T]`, which also has documentation using this feature in `core`, and gets mad
 // that the feature-gate isn't enabled. Ideally, it wouldn't check for the feature gate for docs
 // from other crates, but since this can only appear for lang items, it doesn't seem worth fixing.
-#![feature(intra_doc_pointers)]
+#![cfg_attr(doc, feature(intra_doc_pointers))]
 
 // Module with internal macros used by other modules (needs to be included before other modules).
 #[macro_use]

library/core/src/lib.rs

@@ -95,9 +95,25 @@
 //
 // Library features:
 // tidy-alphabetical-start
-#![feature(array_ptr_get)]
-#![feature(asm_experimental_arch)]
-#![feature(bstr)]
+#![cfg_attr(doc, feature(intra_doc_pointers))]
+#![cfg_attr(
+    not(any(
+        target_arch = "x86",
+        target_arch = "x86_64",
+        target_arch = "arm",
+        target_arch = "aarch64",
+        target_arch = "arm64ec",
+        target_arch = "riscv32",
+        target_arch = "riscv64",
+        target_arch = "loongarch32",
+        target_arch = "loongarch64",
+        target_arch = "s390x",
+        target_arch = "powerpc",
+        target_arch = "powerpc64"
+    )),
+    feature(asm_experimental_arch)
+)]
+#![cfg_attr(windows, feature(link_cfg))]
 #![feature(bstr_internals)]
 #![feature(cfg_select)]
 #![feature(cfg_target_has_reliable_f16_f128)]
@@ -106,31 +122,14 @@
 #![feature(const_destruct)]
 #![feature(const_eval_select)]
 #![feature(const_select_unpredictable)]
-#![feature(const_unsigned_bigint_helpers)]
 #![feature(core_intrinsics)]
 #![feature(coverage_attribute)]
 #![feature(disjoint_bitor)]
 #![feature(internal_impls_macro)]
-#![feature(ip)]
-#![feature(is_ascii_octdigit)]
-#![feature(link_cfg)]
 #![feature(offset_of_enum)]
 #![feature(panic_internals)]
 #![feature(pattern_type_macro)]
-#![feature(ptr_alignment_type)]
-#![feature(ptr_metadata)]
-#![feature(set_ptr_value)]
-#![feature(signed_bigint_helpers)]
-#![feature(slice_ptr_get)]
-#![feature(str_internals)]
-#![feature(str_split_inclusive_remainder)]
-#![feature(str_split_remainder)]
-#![feature(type_info)]
 #![feature(ub_checks)]
-#![feature(unsafe_pinned)]
-#![feature(utf16_extra)]
-#![feature(variant_count)]
-#![feature(widening_mul)]
 // tidy-alphabetical-end
 //
 // Language features:
@@ -159,7 +158,6 @@
 #![feature(fundamental)]
 #![feature(funnel_shifts)]
 #![feature(if_let_guard)]
-#![feature(intra_doc_pointers)]
 #![feature(intrinsics)]
 #![feature(lang_items)]
 #![feature(link_llvm_intrinsics)]
@@ -175,7 +173,6 @@
 #![feature(optimize_attribute)]
 #![feature(pattern_types)]
 #![feature(prelude_import)]
-#![feature(reborrow)]
 #![feature(repr_simd)]
 #![feature(rustc_allow_const_fn_unstable)]
 #![feature(rustc_attrs)]
@@ -195,19 +192,28 @@
 //
 // Target features:
 // tidy-alphabetical-start
-#![feature(aarch64_unstable_target_feature)]
-#![feature(arm_target_feature)]
-#![feature(avx10_target_feature)]
-#![feature(hexagon_target_feature)]
-#![feature(loongarch_target_feature)]
-#![feature(mips_target_feature)]
-#![feature(nvptx_target_feature)]
-#![feature(powerpc_target_feature)]
-#![feature(riscv_target_feature)]
-#![feature(rtm_target_feature)]
-#![feature(s390x_target_feature)]
-#![feature(wasm_target_feature)]
-#![feature(x86_amx_intrinsics)]
+#![cfg_attr(
+    any(target_arch = "loongarch32", target_arch = "loongarch64"),
+    feature(loongarch_target_feature)
+)]
+#![cfg_attr(any(target_arch = "mips", target_arch = "mips64"), feature(mips_target_feature))]
+#![cfg_attr(
+    any(target_arch = "powerpc", target_arch = "powerpc64"),
+    feature(powerpc_target_feature)
+)]
+#![cfg_attr(any(target_arch = "riscv32", target_arch = "riscv64"), feature(riscv_target_feature))]
+#![cfg_attr(any(target_arch = "x86", target_arch = "x86_64"), feature(avx10_target_feature))]
+#![cfg_attr(any(target_arch = "x86", target_arch = "x86_64"), feature(rtm_target_feature))]
+#![cfg_attr(any(target_arch = "x86", target_arch = "x86_64"), feature(x86_amx_intrinsics))]
+#![cfg_attr(
+    any(target_family = "wasm", target_arch = "wasm32", target_arch = "wasm64"),
+    feature(wasm_target_feature)
+)]
+#![cfg_attr(target_arch = "aarch64", feature(aarch64_unstable_target_feature))]
+#![cfg_attr(target_arch = "arm", feature(arm_target_feature))]
+#![cfg_attr(target_arch = "hexagon", feature(hexagon_target_feature))]
+#![cfg_attr(target_arch = "nvptx64", feature(nvptx_target_feature))]
+#![cfg_attr(target_arch = "s390x", feature(s390x_target_feature))]
 // tidy-alphabetical-end
 
 // allow using `core::` in intra-doc links

library/panic_unwind/src/lib.rs

@@ -16,8 +16,6 @@
 #![doc(issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/")]
 #![feature(cfg_emscripten_wasm_eh)]
 #![feature(cfg_select)]
-#![feature(core_intrinsics)]
-#![feature(lang_items)]
 #![feature(panic_unwind)]
 #![feature(staged_api)]
 #![feature(std_internals)]

library/test/src/lib.rs

@@ -24,7 +24,7 @@
 #![feature(staged_api)]
 #![feature(process_exitcode_internals)]
 #![feature(panic_can_unwind)]
-#![feature(test)]
+#![cfg_attr(test, feature(test))]
 #![feature(thread_spawn_hook)]
 #![allow(internal_features)]
 #![warn(rustdoc::unescaped_backticks)]

library/unwind/src/lib.rs

@@ -2,9 +2,19 @@
 #![unstable(feature = "panic_unwind", issue = "32837")]
 #![feature(cfg_emscripten_wasm_eh)]
 #![feature(cfg_select)]
-#![feature(link_cfg)]
+#![cfg_attr(
+    any(
+        target_env = "musl",
+        target_env = "ohos",
+        target_os = "android",
+        all(target_os = "linux", any(target_env = "gnu", target_env = "uclibc")),
+        target_os = "redox",
+        target_os = "freebsd",
+        all(target_os = "windows", target_env = "gnu", target_abi = "llvm")
+    ),
+    feature(link_cfg)
+)]
 #![feature(staged_api)]
-#![cfg_attr(not(target_env = "msvc"), feature(libc))]
 #![cfg_attr(
     all(target_family = "wasm", any(not(target_os = "emscripten"), emscripten_wasm_eh)),
     feature(link_llvm_intrinsics, simd_wasm64)