2 files changed, 15 insertions, 2 deletions
diff --git a/compiler/rustc_codegen_ssa/src/back/write.rs b/compiler/rustc_codegen_ssa/src/back/write.rs
index 53ba0da7d04..f112cea6c82 100644
--- a/compiler/rustc_codegen_ssa/src/back/write.rs
+++ b/compiler/rustc_codegen_ssa/src/back/write.rs
@@ -107,6 +107,7 @@ pub struct ModuleConfig {
     pub emit_asm: bool,
     pub emit_obj: EmitObj,
     pub emit_thin_lto: bool,
+    pub emit_thin_lto_summary: bool,
     pub bc_cmdline: String,
 
     // Miscellaneous flags. These are mostly copied from command-line
@@ -231,6 +232,10 @@ impl ModuleConfig {
             ),
             emit_obj,
             emit_thin_lto: sess.opts.unstable_opts.emit_thin_lto,
+            emit_thin_lto_summary: if_regular!(
+                sess.opts.output_types.contains_key(&OutputType::ThinLinkBitcode),
+                false
+            ),
             bc_cmdline: sess.target.bitcode_llvm_cmdline.to_string(),
 
             verify_llvm_ir: sess.verify_llvm_ir(),
@@ -282,6 +287,7 @@ impl ModuleConfig {
 
     pub fn bitcode_needed(&self) -> bool {
         self.emit_bc
+            || self.emit_thin_lto_summary
             || self.emit_obj == EmitObj::Bitcode
             || self.emit_obj == EmitObj::ObjectCode(BitcodeSection::Full)
     }
@@ -629,6 +635,9 @@ fn produce_final_output_artifacts(
                 // them for making an rlib.
                 copy_if_one_unit(OutputType::Bitcode, true);
             }
+            OutputType::ThinLinkBitcode => {
+                copy_if_one_unit(OutputType::ThinLinkBitcode, false);
+            }
             OutputType::LlvmAssembly => {
                 copy_if_one_unit(OutputType::LlvmAssembly, false);
             }
@@ -882,7 +891,7 @@ fn execute_optimize_work_item<B: ExtraBackendMethods>(
     match lto_type {
         ComputedLtoType::No => finish_intra_module_work(cgcx, module, module_config),
         ComputedLtoType::Thin => {
-            let (name, thin_buffer) = B::prepare_thin(module);
+            let (name, thin_buffer) = B::prepare_thin(module, false);
             if let Some(path) = bitcode {
                 fs::write(&path, thin_buffer.data()).unwrap_or_else(|e| {
                     panic!("Error writing pre-lto-bitcode file `{}`: {}", path.display(), e);
diff --git a/compiler/rustc_codegen_ssa/src/traits/write.rs b/compiler/rustc_codegen_ssa/src/traits/write.rs
index 048540894ac..f83e34ab01b 100644
--- a/compiler/rustc_codegen_ssa/src/traits/write.rs
+++ b/compiler/rustc_codegen_ssa/src/traits/write.rs
@@ -56,12 +56,16 @@ pub trait WriteBackendMethods: 'static + Sized + Clone {
         module: ModuleCodegen<Self::Module>,
         config: &ModuleConfig,
     ) -> Result<CompiledModule, FatalError>;
-    fn prepare_thin(module: ModuleCodegen<Self::Module>) -> (String, Self::ThinBuffer);
+    fn prepare_thin(
+        module: ModuleCodegen<Self::Module>,
+        want_summary: bool,
+    ) -> (String, Self::ThinBuffer);
     fn serialize_module(module: ModuleCodegen<Self::Module>) -> (String, Self::ModuleBuffer);
 }
 
 pub trait ThinBufferMethods: Send + Sync {
     fn data(&self) -> &[u8];
+    fn thin_link_data(&self) -> &[u8];
 }
 
 pub trait ModuleBufferMethods: Send + Sync {