diff --git a/lldb/include/lldb/Symbol/CompilerType.h b/lldb/include/lldb/Symbol/CompilerType.h
--- a/lldb/include/lldb/Symbol/CompilerType.h
+++ b/lldb/include/lldb/Symbol/CompilerType.h
@@ -96,7 +96,7 @@
 
   bool IsFloatingPointType(uint32_t &count, bool &is_complex) const;
 
-  bool IsFunctionType(bool *is_variadic_ptr = nullptr) const;
+  bool IsFunctionType() const;
 
   uint32_t IsHomogeneousAggregate(CompilerType *base_type_ptr) const;
 
diff --git a/lldb/include/lldb/Symbol/TypeSystem.h b/lldb/include/lldb/Symbol/TypeSystem.h
--- a/lldb/include/lldb/Symbol/TypeSystem.h
+++ b/lldb/include/lldb/Symbol/TypeSystem.h
@@ -152,8 +152,7 @@
   virtual bool IsFloatingPointType(lldb::opaque_compiler_type_t type,
                                    uint32_t &count, bool &is_complex) = 0;
 
-  virtual bool IsFunctionType(lldb::opaque_compiler_type_t type,
-                              bool *is_variadic_ptr) = 0;
+  virtual bool IsFunctionType(lldb::opaque_compiler_type_t type) = 0;
 
   virtual size_t
   GetNumberOfFunctionArguments(lldb::opaque_compiler_type_t type) = 0;
diff --git a/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.h b/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.h
--- a/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.h
+++ b/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.h
@@ -578,8 +578,7 @@
   bool IsFloatingPointType(lldb::opaque_compiler_type_t type, uint32_t &count,
                            bool &is_complex) override;
 
-  bool IsFunctionType(lldb::opaque_compiler_type_t type,
-                      bool *is_variadic_ptr) override;
+  bool IsFunctionType(lldb::opaque_compiler_type_t type) override;
 
   uint32_t IsHomogeneousAggregate(lldb::opaque_compiler_type_t type,
                                   CompilerType *base_type_ptr) override;
diff --git a/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp b/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp
--- a/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp
+++ b/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp
@@ -2915,20 +2915,11 @@
   return false;
 }
 
-bool TypeSystemClang::IsFunctionType(lldb::opaque_compiler_type_t type,
-                                     bool *is_variadic_ptr) {
+bool TypeSystemClang::IsFunctionType(lldb::opaque_compiler_type_t type) {
   if (type) {
     clang::QualType qual_type = RemoveWrappingTypes(GetCanonicalQualType(type));
 
     if (qual_type->isFunctionType()) {
-      if (is_variadic_ptr) {
-        const clang::FunctionProtoType *function_proto_type =
-            llvm::dyn_cast<clang::FunctionProtoType>(qual_type.getTypePtr());
-        if (function_proto_type)
-          *is_variadic_ptr = function_proto_type->isVariadic();
-        else
-          *is_variadic_ptr = false;
-      }
       return true;
     }
 
@@ -2941,8 +2932,8 @@
       const clang::ReferenceType *reference_type =
           llvm::cast<clang::ReferenceType>(qual_type.getTypePtr());
       if (reference_type)
-        return IsFunctionType(reference_type->getPointeeType().getAsOpaquePtr(),
-                              nullptr);
+        return IsFunctionType(
+            reference_type->getPointeeType().getAsOpaquePtr());
     } break;
     }
   }
diff --git a/lldb/source/Symbol/CompilerType.cpp b/lldb/source/Symbol/CompilerType.cpp
--- a/lldb/source/Symbol/CompilerType.cpp
+++ b/lldb/source/Symbol/CompilerType.cpp
@@ -92,9 +92,9 @@
   return false;
 }
 
-bool CompilerType::IsFunctionType(bool *is_variadic_ptr) const {
+bool CompilerType::IsFunctionType() const {
   if (IsValid())
-    return m_type_system->IsFunctionType(m_type, is_variadic_ptr);
+    return m_type_system->IsFunctionType(m_type);
   return false;
 }