Set dso_local for more items

compiler/rustc_codegen_llvm/src/base.rs

@@ -204,3 +204,27 @@ pub fn visibility_to_llvm(linkage: Visibility) -> llvm::Visibility {
         Visibility::Protected => llvm::Visibility::Protected,
     }
 }
+
+pub fn linkage_from_llvm(linkage: llvm::Linkage) -> Linkage {
+    match linkage {
+        llvm::Linkage::ExternalLinkage => Linkage::External,
+        llvm::Linkage::AvailableExternallyLinkage => Linkage::AvailableExternally,
+        llvm::Linkage::LinkOnceAnyLinkage => Linkage::LinkOnceAny,
+        llvm::Linkage::LinkOnceODRLinkage => Linkage::LinkOnceODR,
+        llvm::Linkage::WeakAnyLinkage => Linkage::WeakAny,
+        llvm::Linkage::WeakODRLinkage => Linkage::WeakODR,
+        llvm::Linkage::AppendingLinkage => Linkage::Appending,
+        llvm::Linkage::InternalLinkage => Linkage::Internal,
+        llvm::Linkage::PrivateLinkage => Linkage::Private,
+        llvm::Linkage::ExternalWeakLinkage => Linkage::ExternalWeak,
+        llvm::Linkage::CommonLinkage => Linkage::Common,
+    }
+}
+
+pub fn visibility_from_llvm(linkage: llvm::Visibility) -> Visibility {
+    match linkage {
+        llvm::Visibility::Default => Visibility::Default,
+        llvm::Visibility::Hidden => Visibility::Hidden,
+        llvm::Visibility::Protected => Visibility::Protected,
+    }
+}

compiler/rustc_codegen_llvm/src/consts.rs

@@ -17,6 +17,7 @@ use rustc_middle::mir::mono::MonoItem;
 use rustc_middle::ty::{self, Instance, Ty};
 use rustc_middle::{bug, span_bug};
 use rustc_target::abi::{AddressSpace, Align, HasDataLayout, LayoutOf, Primitive, Scalar, Size};
+use rustc_target::spec::RelocModel;
 use tracing::debug;
 
 pub fn const_alloc_to_llvm(cx: &CodegenCx<'ll, '_>, alloc: &Allocation) -> &'ll Value {
@@ -282,6 +283,12 @@ impl CodegenCx<'ll, 'tcx> {
             }
         }
 
+        if self.tcx.sess.relocation_model() == RelocModel::Static {
+            unsafe {
+                llvm::LLVMRustSetDSOLocal(g, true);
+            }
+        }
+
         self.instances.borrow_mut().insert(instance, g);
         g
     }
@@ -363,6 +370,12 @@ impl StaticMethods for CodegenCx<'ll, 'tcx> {
             set_global_alignment(&self, g, self.align_of(ty));
             llvm::LLVMSetInitializer(g, v);
 
+            let linkage = base::linkage_from_llvm(llvm::LLVMRustGetLinkage(g));
+            let visibility = base::visibility_from_llvm(llvm::LLVMRustGetVisibility(g));
+            if self.should_assume_dso_local(linkage, visibility) {
+                llvm::LLVMRustSetDSOLocal(g, true);
+            }
+
             // As an optimization, all shared statics which do not have interior
             // mutability are placed into read-only memory.
             if !is_mutable && self.type_is_freeze(ty) {

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -54,7 +54,7 @@ pub enum CallConv {
 }
 
 /// LLVMRustLinkage
-#[derive(PartialEq)]
+#[derive(Copy, Clone, PartialEq)]
 #[repr(C)]
 pub enum Linkage {
     ExternalLinkage = 0,
@@ -72,6 +72,7 @@ pub enum Linkage {
 
 // LLVMRustVisibility
 #[repr(C)]
+#[derive(Copy, Clone)]
 pub enum Visibility {
     Default = 0,
     Hidden = 1,