1 files changed, 6 insertions, 1 deletions
diff --git a/include/llvm/CodeGen/Passes.h b/include/llvm/CodeGen/Passes.h
index 7df4cbf..ae4a2fa 100644
--- a/include/llvm/CodeGen/Passes.h
+++ b/include/llvm/CodeGen/Passes.h
@@ -25,7 +25,6 @@ class FunctionPass;
 class MachineFunctionPass;
 class PassConfigImpl;
 class PassInfo;
-class PassManagerBase;
 class ScheduleDAGInstrs;
 class TargetLowering;
 class TargetLoweringBase;
@@ -33,6 +32,12 @@ class TargetRegisterClass;
 class raw_ostream;
 struct MachineSchedContext;
 
+// The old pass manager infrastructure is hidden in a legacy namespace now.
+namespace legacy {
+class PassManagerBase;
+}
+using legacy::PassManagerBase;
+
 /// Discriminated union of Pass ID types.
 ///
 /// The PassConfig API prefers dealing with IDs because they are safer and more