diff --git a/tests/ui/array-slice-vec/box-of-array-of-drop-1.rs b/tests/ui/array-slice-vec/box-of-array-of-drop-1.rs
index d64df4f7e4d9a..c7c05946c4ca9 100644
--- a/tests/ui/array-slice-vec/box-of-array-of-drop-1.rs
+++ b/tests/ui/array-slice-vec/box-of-array-of-drop-1.rs
@@ -1,12 +1,12 @@
 //@ run-pass
 //@ needs-unwind
+//@ needs-threads
+
 #![allow(overflowing_literals)]
 
 // Test that we cleanup a fixed size Box<[D; k]> properly when D has a
 // destructor.
 
-//@ ignore-emscripten no threads support
-
 use std::thread;
 use std::sync::atomic::{AtomicUsize, Ordering};
 
diff --git a/tests/ui/array-slice-vec/box-of-array-of-drop-2.rs b/tests/ui/array-slice-vec/box-of-array-of-drop-2.rs
index 5ca3d60ad1dc9..98175a26ec0d1 100644
--- a/tests/ui/array-slice-vec/box-of-array-of-drop-2.rs
+++ b/tests/ui/array-slice-vec/box-of-array-of-drop-2.rs
@@ -1,12 +1,12 @@
 //@ run-pass
 //@ needs-unwind
+//@ needs-threads
+
 #![allow(overflowing_literals)]
 
 // Test that we cleanup dynamic sized Box<[D]> properly when D has a
 // destructor.
 
-//@ ignore-emscripten no threads support
-
 use std::thread;
 use std::sync::atomic::{AtomicUsize, Ordering};
 
diff --git a/tests/ui/array-slice-vec/nested-vec-3.rs b/tests/ui/array-slice-vec/nested-vec-3.rs
index ce61401aab451..51975743742cf 100644
--- a/tests/ui/array-slice-vec/nested-vec-3.rs
+++ b/tests/ui/array-slice-vec/nested-vec-3.rs
@@ -1,8 +1,8 @@
 //@ run-pass
 //@ needs-unwind
-#![allow(overflowing_literals)]
+//@ needs-threads
 
-//@ ignore-emscripten no threads support
+#![allow(overflowing_literals)]
 
 // Test that using the `vec!` macro nested within itself works when
 // the contents implement Drop and we hit a panic in the middle of
diff --git a/tests/ui/array-slice-vec/slice-panic-1.rs b/tests/ui/array-slice-vec/slice-panic-1.rs
index d4f584c163222..a745dff96afc7 100644
--- a/tests/ui/array-slice-vec/slice-panic-1.rs
+++ b/tests/ui/array-slice-vec/slice-panic-1.rs
@@ -1,7 +1,6 @@
 //@ run-pass
 //@ needs-unwind
-
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 // Test that if a slicing expr[..] fails, the correct cleanups happen.
 
diff --git a/tests/ui/array-slice-vec/slice-panic-2.rs b/tests/ui/array-slice-vec/slice-panic-2.rs
index b3d1dc455735a..483a4cbe245db 100644
--- a/tests/ui/array-slice-vec/slice-panic-2.rs
+++ b/tests/ui/array-slice-vec/slice-panic-2.rs
@@ -1,7 +1,6 @@
 //@ run-pass
 //@ needs-unwind
-
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 // Test that if a slicing expr[..] fails, the correct cleanups happen.
 
diff --git a/tests/ui/box/unit/unwind-unique.rs b/tests/ui/box/unit/unwind-unique.rs
index 512327c9af456..1da55c45ee969 100644
--- a/tests/ui/box/unit/unwind-unique.rs
+++ b/tests/ui/box/unit/unwind-unique.rs
@@ -1,6 +1,6 @@
 //@ run-pass
 //@ needs-unwind
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 use std::thread;
 
diff --git a/tests/ui/cleanup-rvalue-temp-during-incomplete-alloc.rs b/tests/ui/cleanup-rvalue-temp-during-incomplete-alloc.rs
index 80c5a8fe0995f..4c59df24e4b3f 100644
--- a/tests/ui/cleanup-rvalue-temp-during-incomplete-alloc.rs
+++ b/tests/ui/cleanup-rvalue-temp-during-incomplete-alloc.rs
@@ -20,7 +20,7 @@
 // It's unclear how likely such a bug is to recur, but it seems like a
 // scenario worth testing.
 
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 use std::thread;
 
diff --git a/tests/ui/drop/drop-trait-enum.rs b/tests/ui/drop/drop-trait-enum.rs
index 91b5bcdf7301d..5a88d959ec6fa 100644
--- a/tests/ui/drop/drop-trait-enum.rs
+++ b/tests/ui/drop/drop-trait-enum.rs
@@ -2,7 +2,7 @@
 #![allow(dead_code)]
 #![allow(unused_assignments)]
 #![allow(unused_variables)]
-//@ ignore-emscripten no threads support
+//@ needs-threads
 //@ needs-unwind
 
 use std::thread;
diff --git a/tests/ui/drop/terminate-in-initializer.rs b/tests/ui/drop/terminate-in-initializer.rs
index 23169aaf65bdc..24ec39fe09638 100644
--- a/tests/ui/drop/terminate-in-initializer.rs
+++ b/tests/ui/drop/terminate-in-initializer.rs
@@ -1,6 +1,6 @@
 //@ run-pass
 //@ needs-unwind
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 // Issue #787
 // Don't try to clean up uninitialized locals
diff --git a/tests/ui/extern/issue-64655-allow-unwind-when-calling-panic-directly.rs b/tests/ui/extern/issue-64655-allow-unwind-when-calling-panic-directly.rs
index e9471d207da48..1cd52b70315c1 100644
--- a/tests/ui/extern/issue-64655-allow-unwind-when-calling-panic-directly.rs
+++ b/tests/ui/extern/issue-64655-allow-unwind-when-calling-panic-directly.rs
@@ -1,6 +1,6 @@
 //@ run-pass
 //@ needs-unwind
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 // rust-lang/rust#64655: with panic=unwind, a panic from a subroutine
 // should still run destructors as it unwinds the stack. However,
diff --git a/tests/ui/extern/issue-64655-extern-rust-must-allow-unwind.rs b/tests/ui/extern/issue-64655-extern-rust-must-allow-unwind.rs
index 9486b5f1178c4..a44eb3828d0a9 100644
--- a/tests/ui/extern/issue-64655-extern-rust-must-allow-unwind.rs
+++ b/tests/ui/extern/issue-64655-extern-rust-must-allow-unwind.rs
@@ -1,6 +1,6 @@
 //@ run-pass
 //@ needs-unwind
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 // rust-lang/rust#64655: with panic=unwind, a panic from a subroutine
 // should still run destructors as it unwinds the stack. However,
diff --git a/tests/ui/issues/issue-25089.rs b/tests/ui/issues/issue-25089.rs
index ea9ab290904c3..929738c3e794d 100644
--- a/tests/ui/issues/issue-25089.rs
+++ b/tests/ui/issues/issue-25089.rs
@@ -1,6 +1,6 @@
 //@ run-pass
 //@ needs-unwind
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 use std::thread;
 
diff --git a/tests/ui/issues/issue-26655.rs b/tests/ui/issues/issue-26655.rs
index 7f1858fdb7d0e..416472b0b269e 100644
--- a/tests/ui/issues/issue-26655.rs
+++ b/tests/ui/issues/issue-26655.rs
@@ -1,6 +1,6 @@
 //@ run-pass
 //@ needs-unwind
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 // Check that the destructors of simple enums are run on unwinding
 
diff --git a/tests/ui/issues/issue-29485.rs b/tests/ui/issues/issue-29485.rs
index 56865d0e5db15..a44bcd49c6a9c 100644
--- a/tests/ui/issues/issue-29485.rs
+++ b/tests/ui/issues/issue-29485.rs
@@ -2,7 +2,7 @@
 #![allow(unused_attributes)]
 //@ aux-build:issue-29485.rs
 //@ needs-unwind
-//@ ignore-emscripten no threads
+//@ needs-threads
 
 #[feature(recover)]
 
diff --git a/tests/ui/issues/issue-30018-panic.rs b/tests/ui/issues/issue-30018-panic.rs
index f5482d7c741df..591848b6f7b4e 100644
--- a/tests/ui/issues/issue-30018-panic.rs
+++ b/tests/ui/issues/issue-30018-panic.rs
@@ -5,7 +5,7 @@
 // SIGTRAP injected by the drop-flag consistency checking.
 
 //@ needs-unwind
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 struct Foo;
 
diff --git a/tests/ui/issues/issue-38763.rs b/tests/ui/issues/issue-38763.rs
index 05cd648dcfe97..87c758db1723c 100644
--- a/tests/ui/issues/issue-38763.rs
+++ b/tests/ui/issues/issue-38763.rs
@@ -1,5 +1,5 @@
 //@ run-pass
-//@ ignore-emscripten
+//@ needs-threads
 
 #[repr(C)]
 pub struct Foo(i128);
diff --git a/tests/ui/numbers-arithmetic/int-abs-overflow.rs b/tests/ui/numbers-arithmetic/int-abs-overflow.rs
index e91141380482d..6397f62d06551 100644
--- a/tests/ui/numbers-arithmetic/int-abs-overflow.rs
+++ b/tests/ui/numbers-arithmetic/int-abs-overflow.rs
@@ -1,6 +1,6 @@
 //@ run-pass
 //@ compile-flags: -C overflow-checks=on
-//@ ignore-emscripten no threads support
+//@ needs-threads
 //@ needs-unwind
 
 use std::thread;
diff --git a/tests/ui/numbers-arithmetic/issue-8460.rs b/tests/ui/numbers-arithmetic/issue-8460.rs
index 9d3044a7ca022..87867fdc93e41 100644
--- a/tests/ui/numbers-arithmetic/issue-8460.rs
+++ b/tests/ui/numbers-arithmetic/issue-8460.rs
@@ -1,6 +1,6 @@
 //@ run-pass
 #![allow(unused_must_use)]
-//@ ignore-emscripten no threads support
+//@ needs-threads
 //@ needs-unwind
 #![feature(rustc_attrs)]
 
diff --git a/tests/ui/panics/panic-handler-chain-update-hook.rs b/tests/ui/panics/panic-handler-chain-update-hook.rs
index 1f8fe30cfd8c2..662ea9e978f70 100644
--- a/tests/ui/panics/panic-handler-chain-update-hook.rs
+++ b/tests/ui/panics/panic-handler-chain-update-hook.rs
@@ -2,7 +2,7 @@
 //@ needs-unwind
 #![allow(stable_features)]
 
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 #![feature(std_panic)]
 #![feature(panic_update_hook)]
diff --git a/tests/ui/panics/panic-handler-flail-wildly.rs b/tests/ui/panics/panic-handler-flail-wildly.rs
index 768c9d4c4c5ec..d42dfd68d9cf8 100644
--- a/tests/ui/panics/panic-handler-flail-wildly.rs
+++ b/tests/ui/panics/panic-handler-flail-wildly.rs
@@ -4,7 +4,7 @@
 #![allow(stable_features)]
 #![allow(unused_must_use)]
 
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 #![feature(std_panic)]
 
diff --git a/tests/ui/panics/panic-handler-set-twice.rs b/tests/ui/panics/panic-handler-set-twice.rs
index 902e48b65414e..5f670d5f49298 100644
--- a/tests/ui/panics/panic-handler-set-twice.rs
+++ b/tests/ui/panics/panic-handler-set-twice.rs
@@ -5,7 +5,7 @@
 
 #![feature(std_panic)]
 
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::panic;
diff --git a/tests/ui/panics/panic-in-dtor-drops-fields.rs b/tests/ui/panics/panic-in-dtor-drops-fields.rs
index 4d18dc0e05916..38eb6d0acfb81 100644
--- a/tests/ui/panics/panic-in-dtor-drops-fields.rs
+++ b/tests/ui/panics/panic-in-dtor-drops-fields.rs
@@ -3,7 +3,7 @@
 #![allow(dead_code)]
 #![allow(non_upper_case_globals)]
 
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 use std::thread;
 
diff --git a/tests/ui/panics/panic-recover-propagate.rs b/tests/ui/panics/panic-recover-propagate.rs
index f8be86be19db6..ef6ae4fd7887d 100644
--- a/tests/ui/panics/panic-recover-propagate.rs
+++ b/tests/ui/panics/panic-recover-propagate.rs
@@ -1,6 +1,6 @@
 //@ run-pass
 //@ needs-unwind
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::panic;
diff --git a/tests/ui/process/process-sigpipe.rs b/tests/ui/process/process-sigpipe.rs
index 9db130c26bd68..453e53379fc49 100644
--- a/tests/ui/process/process-sigpipe.rs
+++ b/tests/ui/process/process-sigpipe.rs
@@ -15,7 +15,7 @@
 
 //@ ignore-vxworks no 'sh'
 //@ ignore-fuchsia no 'sh'
-//@ ignore-emscripten No threads
+//@ needs-threads
 //@ only-unix SIGPIPE is a unix feature
 
 use std::process;
diff --git a/tests/ui/sepcomp/sepcomp-unwind.rs b/tests/ui/sepcomp/sepcomp-unwind.rs
index 6a40b5ccc1247..8c25278bb7ec6 100644
--- a/tests/ui/sepcomp/sepcomp-unwind.rs
+++ b/tests/ui/sepcomp/sepcomp-unwind.rs
@@ -2,7 +2,7 @@
 //@ needs-unwind
 #![allow(dead_code)]
 //@ compile-flags: -C codegen-units=3
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 // Test unwinding through multiple compilation units.
 
diff --git a/tests/ui/structs-enums/unit-like-struct-drop-run.rs b/tests/ui/structs-enums/unit-like-struct-drop-run.rs
index 02d14265f3ef2..3d00871837cf8 100644
--- a/tests/ui/structs-enums/unit-like-struct-drop-run.rs
+++ b/tests/ui/structs-enums/unit-like-struct-drop-run.rs
@@ -1,6 +1,6 @@
 //@ run-pass
 //@ needs-unwind
-//@ ignore-emscripten no threads support
+//@ needs-threads
 
 // Make sure the destructor is run for unit-like structs.
 
diff --git a/tests/ui/test-attrs/terse.rs b/tests/ui/test-attrs/terse.rs
index 6c3f29ed10f99..6e605f994f2a3 100644
--- a/tests/ui/test-attrs/terse.rs
+++ b/tests/ui/test-attrs/terse.rs
@@ -4,7 +4,7 @@
 //@ check-run-results
 //@ exec-env:RUST_BACKTRACE=0
 //@ normalize-stdout: "finished in \d+\.\d+s" -> "finished in $$TIME"
-//@ ignore-emscripten no threads support
+//@ needs-threads
 //@ needs-unwind
 
 #[test]
diff --git a/tests/ui/test-attrs/test-thread-capture.rs b/tests/ui/test-attrs/test-thread-capture.rs
index c56f87f2ddac4..0a5b1e9816f2b 100644
--- a/tests/ui/test-attrs/test-thread-capture.rs
+++ b/tests/ui/test-attrs/test-thread-capture.rs
@@ -4,7 +4,7 @@
 //@ check-run-results
 //@ exec-env:RUST_BACKTRACE=0
 //@ normalize-stdout: "finished in \d+\.\d+s" -> "finished in $$TIME"
-//@ ignore-emscripten no threads support
+//@ needs-threads
 //@ needs-unwind
 
 #[test]
diff --git a/tests/ui/test-attrs/test-thread-nocapture.rs b/tests/ui/test-attrs/test-thread-nocapture.rs
index 5b82e9b272076..ce5db7bf1c374 100644
--- a/tests/ui/test-attrs/test-thread-nocapture.rs
+++ b/tests/ui/test-attrs/test-thread-nocapture.rs
@@ -4,7 +4,7 @@
 //@ check-run-results
 //@ exec-env:RUST_BACKTRACE=0
 //@ normalize-stdout: "finished in \d+\.\d+s" -> "finished in $$TIME"
-//@ ignore-emscripten no threads support
+//@ needs-threads
 //@ needs-unwind
 
 #[test]