Auto merge of rust-lang#123506 - RalfJung:miri-test-libstd, r=Mark-Simulacrum

check-aux: test core, alloc, std in Miri

Let's see if this works, and how long it takes.

Author: bors

alloc/benches/lib.rs

@@ -1,6 +1,8 @@
 // Disabling on android for the time being
 // See https://github.com/rust-lang/rust/issues/73535#event-3477699747
 #![cfg(not(target_os = "android"))]
+// Disabling in Miri as these would take too long.
+#![cfg(not(miri))]
 #![feature(btree_extract_if)]
 #![feature(iter_next_chunk)]
 #![feature(repr_simd)]

alloc/src/sync.rs

@@ -1062,7 +1062,9 @@ impl<T, A: Allocator> Arc<T, A> {
     ///
     /// // Create a long list and clone it
     /// let mut x = LinkedList::new();
-    /// for i in 0..100000 {
+    /// let size = 100000;
+    /// # let size = if cfg!(miri) { 100 } else { size };
+    /// for i in 0..size {
     ///     x.push(i); // Adds i to the front of x
     /// }
     /// let y = x.clone();

core/benches/lib.rs

@@ -1,5 +1,7 @@
 // wasm32 does not support benches (no time).
 #![cfg(not(target_arch = "wasm32"))]
+// Disabling in Miri as these would take too long.
+#![cfg(not(miri))]
 #![feature(flt2dec)]
 #![feature(test)]
 #![feature(trusted_random_access)]

std/benches/lib.rs

@@ -1,3 +1,5 @@
+// Disabling in Miri as these would take too long.
+#![cfg(not(miri))]
 #![feature(test)]
 
 extern crate test;

std/tests/process_spawning.rs

@@ -8,6 +8,7 @@ use std::str;
 mod common;
 
 #[test]
+#[cfg_attr(miri, ignore)] // Process spawning not supported by Miri
 fn issue_15149() {
     // If we're the parent, copy our own binary to a new directory.
     let my_path = env::current_exe().unwrap();

std/tests/switch-stdout.rs

@@ -51,6 +51,7 @@ fn switch_stdout_to(file: OwnedHandle) -> OwnedHandle {
 }
 
 #[test]
+#[cfg_attr(miri, ignore)] // dup/SetStdHandle not supported by Miri
 fn switch_stdout() {
     let temp = common::tmpdir();
     let path = temp.join("switch-stdout-output");

std/tests/thread.rs

@@ -5,7 +5,8 @@ use std::time::Duration;
 
 #[test]
 #[cfg_attr(target_os = "emscripten", ignore)]
-fn sleep() {
+#[cfg_attr(miri, ignore)] // Miri does not like the thread leak
+fn sleep_very_long() {
     let finished = Arc::new(Mutex::new(false));
     let t_finished = finished.clone();
     thread::spawn(move || {