Remove warnings due to new lint on unknown cfgs

core/Cargo.toml

@@ -29,6 +29,9 @@ redox_syscall = "0.5"
 [target.'cfg(windows)'.dependencies]
 windows-targets = "0.52.0"
 
+[build-dependencies]
+autocfg = "1.1.0"
+
 [features]
 nightly = []
 deadlock_detection = ["petgraph", "thread-id", "backtrace"]

core/build.rs

@@ -2,7 +2,12 @@
 // doesn't support sanitizers) and nightly (which does). Works because build
 // scripts gets `cfg` info, even if the cfg is unstable.
 fn main() {
+    let cfg = autocfg::new();
+
     println!("cargo:rerun-if-changed=build.rs");
+    if cfg.probe_rustc_version(1, 79) {
+        println!("cargo:rustc-check-cfg=cfg(tsan_enabled)");
+    }
     let santizer_list = std::env::var("CARGO_CFG_SANITIZE").unwrap_or_default();
     if santizer_list.contains("thread") {
         println!("cargo:rustc-cfg=tsan_enabled");

core/src/thread_parker/mod.rs

@@ -82,4 +82,4 @@ cfg_if! {
     }
 }
 
-pub use self::imp::{thread_yield, ThreadParker, UnparkHandle};
+pub use self::imp::{thread_yield, ThreadParker};

lock_api/build.rs

@@ -1,6 +1,10 @@
 fn main() {
     let cfg = autocfg::new();
 
+    println!("cargo:rerun-if-changed=build.rs");
+    if cfg.probe_rustc_version(1, 79) {
+        println!("cargo:rustc-check-cfg=cfg(has_const_fn_trait_bound)");
+    }
     if cfg.probe_rustc_version(1, 61) {
         println!("cargo:rustc-cfg=has_const_fn_trait_bound");
     }

lock_api/src/lib.rs

@@ -100,6 +100,7 @@ extern crate alloc;
 pub struct GuardSend(());
 
 /// Marker type which indicates that the Guard type for a lock is not `Send`.
+#[allow(dead_code)]
 pub struct GuardNoSend(*mut ());
 
 unsafe impl Sync for GuardNoSend {}