Fix for issue 29819

runtime/bin/dfe.h

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_BIN_DFE_H_
 #define RUNTIME_BIN_DFE_H_
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
@@ skipping 16 matching lines @@
   }
 
   void SetKernelBinaries(const char* name);
 
   bool UsePlatformBinary() const { return platform_binary_filename_ != NULL; }
 
   void* kernel_platform() const { return kernel_platform_; }
 
   void* kernel_vmservice_io() const { return kernel_vmservice_io_; }
 
+  bool kernel_file_specified() const { return kernel_file_specified_; }
+  void set_kernel_file_specified(bool value) { kernel_file_specified_ = value; }
+
   // Method to reload a script into a running a isolate.
   // If the specified script [url] is not a kernel IR, compile it first using
   // DFE and then reload the resulting kernel IR into the isolate.
   // Returns Dart_Null if successful, otherwise an error object is returned.
   Dart_Handle ReloadScript(Dart_Isolate isolate, const char* url_string);
 
   // Compiles a script and reads the resulting kernel file.
   // If the compilation is successful, returns a valid in memory kernel
   // representation of the script, NULL otherwise
   // 'error' and 'exit_code' have the error values in case of errors.
@@ skipping 22 matching lines @@
   // was returned.
   bool TryReadKernelFile(const char* script_uri,
                          const uint8_t** kernel_ir,
                          intptr_t* kernel_ir_size);
 
   const char* frontend_filename_;
   char* platform_binary_filename_;
   char* vmservice_io_binary_filename_;
   void* kernel_platform_;
   void* kernel_vmservice_io_;
+  bool kernel_file_specified_;  // Kernel file was specified on the cmd line.
 
   DISALLOW_COPY_AND_ASSIGN(DFE);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // RUNTIME_BIN_DFE_H_