Rollup merge of rust-lang#129640 - saethlin:unignore-android-in-alloc, r=tgross35

Re-enable android tests/benches in alloc/core

This is basically a revert of rust-lang#73729. These tests better work on android now; it's been 4 years and we don't use dlmalloc on that target anymore.

And I've validated that they should pass now with a try-build :)

Author: matthiaskrgr

Diff for: alloc/benches/lib.rs

@@ -1,6 +1,3 @@
-// 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)]

Diff for: alloc/tests/string.rs

@@ -723,7 +723,6 @@ fn test_reserve_exact() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
-#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
 fn test_try_with_capacity() {
     let string = String::try_with_capacity(1000).unwrap();
     assert_eq!(0, string.len());
@@ -734,7 +733,6 @@ fn test_try_with_capacity() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
-#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
 fn test_try_reserve() {
     // These are the interesting cases:
     // * exactly isize::MAX should never trigger a CapacityOverflow (can be OOM)
@@ -803,7 +801,6 @@ fn test_try_reserve() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
-#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
 fn test_try_reserve_exact() {
     // This is exactly the same as test_try_reserve with the method changed.
     // See that test for comments.

Diff for: alloc/tests/vec.rs

@@ -1695,7 +1695,6 @@ fn test_reserve_exact() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
-#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
 fn test_try_with_capacity() {
     let mut vec: Vec<u32> = Vec::try_with_capacity(5).unwrap();
     assert_eq!(0, vec.len());
@@ -1707,7 +1706,6 @@ fn test_try_with_capacity() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
-#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
 fn test_try_reserve() {
     // These are the interesting cases:
     // * exactly isize::MAX should never trigger a CapacityOverflow (can be OOM)
@@ -1803,7 +1801,6 @@ fn test_try_reserve() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
-#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
 fn test_try_reserve_exact() {
     // This is exactly the same as test_try_reserve with the method changed.
     // See that test for comments.

Diff for: alloc/tests/vec_deque.rs

@@ -1185,7 +1185,6 @@ fn test_reserve_exact_2() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
-#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
 fn test_try_with_capacity() {
     let vec: VecDeque<u32> = VecDeque::try_with_capacity(5).unwrap();
     assert_eq!(0, vec.len());
@@ -1196,7 +1195,6 @@ fn test_try_with_capacity() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
-#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
 fn test_try_reserve() {
     // These are the interesting cases:
     // * exactly isize::MAX should never trigger a CapacityOverflow (can be OOM)
@@ -1292,7 +1290,6 @@ fn test_try_reserve() {
 
 #[test]
 #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
-#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
 fn test_try_reserve_exact() {
     // This is exactly the same as test_try_reserve with the method changed.
     // See that test for comments.

Diff for: core/tests/num/int_log.rs

@@ -1,7 +1,4 @@
-//! This tests the `Integer::{ilog,log2,log10}` methods. These tests are in a
-//! separate file because there's both a large number of them, and not all tests
-//! can be run on Android. This is because in Android `ilog2` uses an imprecise
-//! approximation:https://github.com/rust-lang/rust/blob/4825e12fc9c79954aa0fe18f5521efa6c19c7539/src/libstd/sys/unix/android.rs#L27-L53
+//! Tests for the `Integer::{ilog,log2,log10}` methods.
 
 #[test]
 fn checked_ilog() {
@@ -48,6 +45,10 @@ fn checked_ilog2() {
     assert_eq!(0i8.checked_ilog2(), None);
     assert_eq!(0i16.checked_ilog2(), None);
 
+    assert_eq!(8192u16.checked_ilog2(), Some((8192f32).log2() as u32));
+    assert_eq!(32768u16.checked_ilog2(), Some((32768f32).log2() as u32));
+    assert_eq!(8192i16.checked_ilog2(), Some((8192f32).log2() as u32));
+
     for i in 1..=u8::MAX {
         assert_eq!(i.checked_ilog2(), Some((i as f32).log2() as u32), "checking {i}");
     }
@@ -77,15 +78,6 @@ fn checked_ilog2() {
     }
 }
 
-// Validate cases that fail on Android's imprecise float ilog2 implementation.
-#[test]
-#[cfg(not(target_os = "android"))]
-fn checked_ilog2_not_android() {
-    assert_eq!(8192u16.checked_ilog2(), Some((8192f32).log2() as u32));
-    assert_eq!(32768u16.checked_ilog2(), Some((32768f32).log2() as u32));
-    assert_eq!(8192i16.checked_ilog2(), Some((8192f32).log2() as u32));
-}
-
 #[test]
 fn checked_ilog10() {
     assert_eq!(0u8.checked_ilog10(), None);