Index: llvm/lib/Target/AArch64/CMakeLists.txt
--- llvm/lib/Target/AArch64/CMakeLists.txt.orig
+++ llvm/lib/Target/AArch64/CMakeLists.txt
@@ -75,6 +75,7 @@ add_llvm_target(AArch64CodeGen
   AArch64PromoteConstant.cpp
   AArch64PBQPRegAlloc.cpp
   AArch64RegisterInfo.cpp
+  AArch64ReturnProtectorLowering.cpp
   AArch64SLSHardening.cpp
   AArch64SelectionDAGInfo.cpp
   AArch64SpeculationHardening.cpp
