Auto merge of #104179 - Manishearth:rollup-yvsx5hh, r=Manishearth

Rollup of 7 pull requests

Successful merges:

 - #100508 (avoid making substs of type aliases late bound when used as fn args)
 - #101381 (Test that target feature mix up with homogeneous floats is sound)
 - #103353 (Fix Access Violation when using lld & ThinLTO on windows-msvc)
 - #103521 (Avoid possible infinite  loop when next_point reaching the end of file)
 - #103559 (first move on a nested span_label)
 - #103778 (Update several crates for improved support of the new targets)
 - #103827 (Properly remap and check for substs compatibility in `confirm_impl_trait_in_trait_candidate`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

2 files changed, 28 insertions, 0 deletions

diff --git a/src/test/codegen/auxiliary/static_dllimport_aux.rs b/src/test/codegen/auxiliary/static_dllimport_aux.rs
new file mode 100644
index 00000000000..afb0dc42f44
--- /dev/null
+++ b/src/test/codegen/auxiliary/static_dllimport_aux.rs
@@ -0,0 +1,13 @@
+use std::sync::atomic::{AtomicPtr, Ordering};
+
+#[inline(always)]
+pub fn memrchr() {
+    fn detect() {}
+
+    static CROSS_CRATE_STATIC_ITEM: AtomicPtr<()> = AtomicPtr::new(detect as *mut ());
+
+    unsafe {
+        let fun = CROSS_CRATE_STATIC_ITEM.load(Ordering::SeqCst);
+        std::mem::transmute::<*mut (), fn()>(fun)()
+    }
+}
diff --git a/src/test/codegen/issue-81408-dllimport-thinlto-windows.rs b/src/test/codegen/issue-81408-dllimport-thinlto-windows.rs
new file mode 100644
index 00000000000..0b6ab4f7ecb
--- /dev/null
+++ b/src/test/codegen/issue-81408-dllimport-thinlto-windows.rs
@@ -0,0 +1,15 @@
+// compile-flags: -O -C lto=thin -C prefer-dynamic=no
+// only-windows
+// aux-build:static_dllimport_aux.rs
+
+// Test that on Windows, when performing ThinLTO, we do not mark cross-crate static items with
+// dllimport because lld does not fix the symbol names for us.
+
+extern crate static_dllimport_aux;
+
+// CHECK-LABEL: @{{.+}}CROSS_CRATE_STATIC_ITEM{{.+}} =
+// CHECK-SAME: external local_unnamed_addr global %"{{.+}}AtomicPtr
+
+pub fn main() {
+    static_dllimport_aux::memrchr();
+}