1 files changed, 12 insertions, 0 deletions
diff --git a/src/librustc_codegen_ssa/traits/statics.rs b/src/librustc_codegen_ssa/traits/statics.rs
index a6462b35834..817fc02d166 100644
--- a/src/librustc_codegen_ssa/traits/statics.rs
+++ b/src/librustc_codegen_ssa/traits/statics.rs
@@ -5,6 +5,18 @@ use rustc_target::abi::Align;
 pub trait StaticMethods: BackendTypes {
     fn static_addr_of(&self, cv: Self::Value, align: Align, kind: Option<&str>) -> Self::Value;
     fn codegen_static(&self, def_id: DefId, is_mutable: bool);
+
+    /// Mark the given global value as "used", to prevent a backend from potentially removing a
+    /// static variable that may otherwise appear unused.
+    ///
+    /// Static variables in Rust can be annotated with the `#[used]` attribute to direct the `rustc`
+    /// compiler to mark the variable as a "used global".
+    ///
+    /// ```no_run
+    /// #[used]
+    /// static FOO: u32 = 0;
+    /// ```
+    fn add_used_global(&self, global: Self::Value);
 }
 
 pub trait StaticBuilderMethods: BackendTypes {