Index: llvm/include/llvm/Analysis/CFGPrinter.h
===================================================================
--- llvm/include/llvm/Analysis/CFGPrinter.h
+++ llvm/include/llvm/Analysis/CFGPrinter.h
@@ -35,21 +35,25 @@
 class CFGViewerPass : public PassInfoMixin<CFGViewerPass> {
 public:
   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+  static bool isRequired() { return true; }
 };
 
 class CFGOnlyViewerPass : public PassInfoMixin<CFGOnlyViewerPass> {
 public:
   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+  static bool isRequired() { return true; }
 };
 
 class CFGPrinterPass : public PassInfoMixin<CFGPrinterPass> {
 public:
   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+  static bool isRequired() { return true; }
 };
 
 class CFGOnlyPrinterPass : public PassInfoMixin<CFGOnlyPrinterPass> {
 public:
   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+  static bool isRequired() { return true; }
 };
 
 class DOTFuncInfo {