Stabilize cfg_target_has_atomic

Closes #32976

Author: Amanieu

compiler/rustc_feature/src/accepted.rs

@@ -72,6 +72,8 @@ declare_features! (
     (accepted, cfg_doctest, "1.40.0", Some(62210), None),
     /// Allows `cfg(target_feature = "...")`.
     (accepted, cfg_target_feature, "1.27.0", Some(29717), None),
+    /// Allows `cfg(target_has_atomic = "...")`.
+    (accepted, cfg_target_has_atomic, "1.60.0", Some(32976), None),
     /// Allows `cfg(target_vendor = "...")`.
     (accepted, cfg_target_vendor, "1.33.0", Some(29718), None),
     /// Allows implementing `Clone` for closures where possible (RFC 2132).

compiler/rustc_feature/src/active.rs

@@ -309,8 +309,8 @@ declare_features! (
     (active, cfg_sanitize, "1.41.0", Some(39699), None),
     /// Allows `cfg(target_abi = "...")`.
     (active, cfg_target_abi, "1.55.0", Some(80970), None),
-    /// Allows `cfg(target_has_atomic = "...")`.
-    (active, cfg_target_has_atomic, "1.9.0", Some(32976), None),
+    /// Allows `cfg(target_has_atomic_equal_alignment = "...")`.
+    (active, cfg_target_has_atomic_equal_alignment, "1.60.0", Some(93822), None),
     /// Allows `cfg(target_thread_local)`.
     (active, cfg_target_thread_local, "1.7.0", Some(29594), None),
     /// Allow conditional compilation depending on rust version

compiler/rustc_feature/src/builtin_attrs.rs

@@ -26,12 +26,10 @@ const GATED_CFGS: &[GatedCfg] = &[
     // (name in cfg, feature, function to check if the feature is enabled)
     (sym::target_abi, sym::cfg_target_abi, cfg_fn!(cfg_target_abi)),
     (sym::target_thread_local, sym::cfg_target_thread_local, cfg_fn!(cfg_target_thread_local)),
-    (sym::target_has_atomic, sym::cfg_target_has_atomic, cfg_fn!(cfg_target_has_atomic)),
-    (sym::target_has_atomic_load_store, sym::cfg_target_has_atomic, cfg_fn!(cfg_target_has_atomic)),
     (
         sym::target_has_atomic_equal_alignment,
-        sym::cfg_target_has_atomic,
-        cfg_fn!(cfg_target_has_atomic),
+        sym::cfg_target_has_atomic_equal_alignment,
+        cfg_fn!(cfg_target_has_atomic_equal_alignment),
     ),
     (sym::sanitize, sym::cfg_sanitize, cfg_fn!(cfg_sanitize)),
     (sym::version, sym::cfg_version, cfg_fn!(cfg_version)),

compiler/rustc_span/src/symbol.rs

@@ -421,6 +421,7 @@ symbols! {
         cfg_target_abi,
         cfg_target_feature,
         cfg_target_has_atomic,
+        cfg_target_has_atomic_equal_alignment,
         cfg_target_thread_local,
         cfg_target_vendor,
         cfg_version,

library/alloc/src/lib.rs

@@ -140,7 +140,7 @@
 #![feature(associated_type_bounds)]
 #![feature(box_syntax)]
 #![feature(cfg_sanitize)]
-#![feature(cfg_target_has_atomic)]
+#![cfg_attr(bootstrap, feature(cfg_target_has_atomic))]
 #![feature(const_deref)]
 #![feature(const_fn_trait_bound)]
 #![feature(const_mut_refs)]

library/core/src/lib.rs

@@ -155,7 +155,8 @@
 #![feature(allow_internal_unstable)]
 #![feature(associated_type_bounds)]
 #![feature(auto_traits)]
-#![feature(cfg_target_has_atomic)]
+#![cfg_attr(bootstrap, feature(cfg_target_has_atomic))]
+#![cfg_attr(not(bootstrap), feature(cfg_target_has_atomic_equal_alignment))]
 #![feature(const_fn_floating_point_arithmetic)]
 #![feature(const_fn_fn_ptr_basics)]
 #![feature(const_fn_trait_bound)]

library/core/tests/lib.rs

@@ -7,7 +7,7 @@
 #![feature(box_syntax)]
 #![feature(cell_update)]
 #![feature(cfg_panic)]
-#![feature(cfg_target_has_atomic)]
+#![cfg_attr(bootstrap, feature(cfg_target_has_atomic))]
 #![feature(const_assume)]
 #![feature(const_black_box)]
 #![feature(const_bool_to_option)]

library/std/src/lib.rs

@@ -242,7 +242,7 @@
 #![feature(c_variadic)]
 #![feature(cfg_accessible)]
 #![feature(cfg_eval)]
-#![feature(cfg_target_has_atomic)]
+#![cfg_attr(bootstrap, feature(cfg_target_has_atomic))]
 #![feature(cfg_target_thread_local)]
 #![feature(char_error_internals)]
 #![feature(char_internals)]

src/test/run-make-fulldeps/atomic-lock-free/atomic_lock_free.rs

@@ -1,4 +1,4 @@
-#![feature(cfg_target_has_atomic, no_core, intrinsics, lang_items)]
+#![feature(no_core, intrinsics, lang_items)]
 #![crate_type="rlib"]
 #![no_core]
 

src/test/ui/feature-gates/feature-gate-cfg-target-has-atomic-equal-alignment.rs

@@ -0,0 +1,14 @@
+fn main() {
+    cfg!(target_has_atomic_equal_alignment = "8");
+    //~^ ERROR `cfg(target_has_atomic_equal_alignment)` is experimental and subject to change
+    cfg!(target_has_atomic_equal_alignment = "16");
+    //~^ ERROR `cfg(target_has_atomic_equal_alignment)` is experimental and subject to change
+    cfg!(target_has_atomic_equal_alignment = "32");
+    //~^ ERROR `cfg(target_has_atomic_equal_alignment)` is experimental and subject to change
+    cfg!(target_has_atomic_equal_alignment = "64");
+    //~^ ERROR `cfg(target_has_atomic_equal_alignment)` is experimental and subject to change
+    cfg!(target_has_atomic_equal_alignment = "128");
+    //~^ ERROR `cfg(target_has_atomic_equal_alignment)` is experimental and subject to change
+    cfg!(target_has_atomic_equal_alignment = "ptr");
+    //~^ ERROR `cfg(target_has_atomic_equal_alignment)` is experimental and subject to change
+}