From e9b67d281a3a1e740217ded7df9fc292f5ba6559 Mon Sep 17 00:00:00 2001
From: Amanieu d'Antras <amanieu@gmail.com>
Date: Sat, 6 Jun 2020 18:26:15 +0100
Subject: [PATCH 1/3] Fix link error with #[thread_local] introduced by #71192

---
 src/librustc_mir/monomorphize/collector.rs |  8 ++++++++
 src/test/ui/tls.rs                         | 12 ++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 src/test/ui/tls.rs

diff --git a/src/librustc_mir/monomorphize/collector.rs b/src/librustc_mir/monomorphize/collector.rs
index 297b899ef0bd6..e0e9bea5eb225 100644
--- a/src/librustc_mir/monomorphize/collector.rs
+++ b/src/librustc_mir/monomorphize/collector.rs
@@ -586,6 +586,14 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirNeighborCollector<'a, 'tcx> {
                     self.output.push(create_fn_mono_item(instance));
                 }
             }
+            mir::Rvalue::ThreadLocalRef(def_id) => {
+                assert!(self.tcx.is_thread_local_static(def_id));
+                let instance = Instance::mono(self.tcx, def_id);
+                if should_monomorphize_locally(self.tcx, &instance) {
+                    trace!("collecting thread-local static {:?}", def_id);
+                    self.output.push(MonoItem::Static(def_id));
+                }
+            }
             _ => { /* not interesting */ }
         }
 
diff --git a/src/test/ui/tls.rs b/src/test/ui/tls.rs
new file mode 100644
index 0000000000000..cfc94c10c9e9b
--- /dev/null
+++ b/src/test/ui/tls.rs
@@ -0,0 +1,12 @@
+// run-pass
+
+#![feature(thread_local)]
+
+#[thread_local]
+static S: u32 = 222;
+
+fn main() {
+    let local = &S as *const u32 as usize;
+    let foreign = std::thread::spawn(|| &S as *const u32 as usize).join().unwrap();
+    assert_ne!(local, foreign);
+}

From 2af53e9a15aed1e9798867c9233a722530d03177 Mon Sep 17 00:00:00 2001
From: Amanieu d'Antras <amanieu@gmail.com>
Date: Wed, 10 Jun 2020 22:11:17 +0100
Subject: [PATCH 2/3] Add -O compile flag to test

---
 src/test/ui/tls.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/test/ui/tls.rs b/src/test/ui/tls.rs
index cfc94c10c9e9b..c696318e70f5f 100644
--- a/src/test/ui/tls.rs
+++ b/src/test/ui/tls.rs
@@ -1,4 +1,5 @@
 // run-pass
+// compile-flags: -O
 
 #![feature(thread_local)]
 

From 01e29c778c3749bca42e38adaad5a5ff58449031 Mon Sep 17 00:00:00 2001
From: Amanieu d'Antras <amanieu@gmail.com>
Date: Sat, 13 Jun 2020 13:24:19 +0100
Subject: [PATCH 3/3] Don't run test on emscripten which doesn't have threads

---
 src/test/ui/tls.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/test/ui/tls.rs b/src/test/ui/tls.rs
index c696318e70f5f..fbd3413885f8f 100644
--- a/src/test/ui/tls.rs
+++ b/src/test/ui/tls.rs
@@ -1,4 +1,5 @@
 // run-pass
+// ignore-emscripten no threads support
 // compile-flags: -O
 
 #![feature(thread_local)]