diff --git a/mlir/include/mlir/Dialect/LLVMIR/FunctionCallUtils.h b/mlir/include/mlir/Dialect/LLVMIR/FunctionCallUtils.h
--- a/mlir/include/mlir/Dialect/LLVMIR/FunctionCallUtils.h
+++ b/mlir/include/mlir/Dialect/LLVMIR/FunctionCallUtils.h
@@ -60,7 +60,7 @@
 /// Create a FuncOp with signature `resultType`(`paramTypes`)` and name `name`.
 LLVM::LLVMFuncOp lookupOrCreateFn(ModuleOp moduleOp, StringRef name,
                                   ArrayRef<Type> paramTypes = {},
-                                  Type resultType = {});
+                                  Type resultType = {}, bool isVarArg = false);
 
 } // namespace LLVM
 } // namespace mlir
diff --git a/mlir/lib/Dialect/LLVMIR/IR/FunctionCallUtils.cpp b/mlir/lib/Dialect/LLVMIR/IR/FunctionCallUtils.cpp
--- a/mlir/lib/Dialect/LLVMIR/IR/FunctionCallUtils.cpp
+++ b/mlir/lib/Dialect/LLVMIR/IR/FunctionCallUtils.cpp
@@ -45,14 +45,14 @@
 /// Generic print function lookupOrCreate helper.
 LLVM::LLVMFuncOp mlir::LLVM::lookupOrCreateFn(ModuleOp moduleOp, StringRef name,
                                               ArrayRef<Type> paramTypes,
-                                              Type resultType) {
+                                              Type resultType, bool isVarArg) {
   auto func = moduleOp.lookupSymbol<LLVM::LLVMFuncOp>(name);
   if (func)
     return func;
   OpBuilder b(moduleOp.getBodyRegion());
   return b.create<LLVM::LLVMFuncOp>(
       moduleOp->getLoc(), name,
-      LLVM::LLVMFunctionType::get(resultType, paramTypes));
+      LLVM::LLVMFunctionType::get(resultType, paramTypes, isVarArg));
 }
 
 LLVM::LLVMFuncOp mlir::LLVM::lookupOrCreatePrintI64Fn(ModuleOp moduleOp) {