Auto merge of #77013 - RalfJung:rollup-84ut0xq, r=RalfJung

Rollup of 10 pull requests

Successful merges:

 - #76439 (Add error explanation for E0755)
 - #76521 (Fix segfault if pthread_getattr_np fails)
 - #76835 (make replace_prefix only take &str as arguments )
 - #76967 (Revert adding Atomic::from_mut.)
 - #76977 (Add a regression test for copy propagation miscompilation)
 - #76981 (liballoc bench use imported path Bencher)
 - #76983 (BTreeMap: extra testing & fixed comments)
 - #76996 (Fix typo in rustc_lexer docs)
 - #77009 (Dogfood total_cmp in the test crate)
 - #77012 (update Miri for another bugfix)

Failed merges:

 - #76489 (Add explanation for E0756)

r? `@ghost`

1 files changed, 8 insertions, 2 deletions

diff --git a/library/std/src/sys/unix/thread.rs b/library/std/src/sys/unix/thread.rs
index 04da9812ddc..652219e28f6 100644
--- a/library/std/src/sys/unix/thread.rs
+++ b/library/std/src/sys/unix/thread.rs
@@ -294,6 +294,7 @@ pub mod guard {
     unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
         let mut ret = None;
         let mut attr: libc::pthread_attr_t = crate::mem::zeroed();
+        #[cfg(target_os = "freebsd")]
         assert_eq!(libc::pthread_attr_init(&mut attr), 0);
         #[cfg(target_os = "freebsd")]
         let e = libc::pthread_attr_get_np(libc::pthread_self(), &mut attr);
@@ -305,7 +306,9 @@ pub mod guard {
             assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackaddr, &mut stacksize), 0);
             ret = Some(stackaddr);
         }
-        assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
+        if e == 0 || cfg!(target_os = "freebsd") {
+            assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
+        }
         ret
     }
 
@@ -403,6 +406,7 @@ pub mod guard {
     pub unsafe fn current() -> Option<Guard> {
         let mut ret = None;
         let mut attr: libc::pthread_attr_t = crate::mem::zeroed();
+        #[cfg(target_os = "freebsd")]
         assert_eq!(libc::pthread_attr_init(&mut attr), 0);
         #[cfg(target_os = "freebsd")]
         let e = libc::pthread_attr_get_np(libc::pthread_self(), &mut attr);
@@ -446,7 +450,9 @@ pub mod guard {
                 Some(stackaddr..stackaddr + guardsize)
             };
         }
-        assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
+        if e == 0 || cfg!(target_os = "freebsd") {
+            assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
+        }
         ret
     }
 }