Ensure removing processed command line arguments.

test/cctest/test-flags.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 141 matching lines @@
 
 
 TEST(Flags6) {
   SetFlagsToDefault();
   int argc = 4;
   const char* argv[] = { "Test5", "--testing-int-flag", "0",
                          "--testing_float_flag" };
   CHECK_EQ(3, FlagList::SetFlagsFromCommandLine(&argc,
                                                 const_cast<char **>(argv),
                                                 true));
-  CHECK_EQ(4, argc);
+  CHECK_EQ(2, argc);
 }
 
 
 TEST(Flags6b) {
   SetFlagsToDefault();
   const char* str = "       --testing-int-flag 0      --testing_float_flag    ";
   CHECK_EQ(3, FlagList::SetFlagsFromString(str, StrLength(str)));
 }
 
 
@@ skipping 52 matching lines @@
 
 
 TEST(FlagsJSArguments4) {
   SetFlagsToDefault();
   const char* str = "--testing-int-flag 42 --";
   CHECK_EQ(0, FlagList::SetFlagsFromString(str, StrLength(str)));
   CHECK_EQ(42, FLAG_testing_int_flag);
   CHECK_EQ(0, FLAG_js_arguments.argc());
 }
 
+
+TEST(FlagsRemoveIncomplete) {
+  // Test that processed command line arguments are removed, even
+  // if the list of arguments ends unexpectedly.
+  SetFlagsToDefault();
+  int argc = 3;
+  const char* argv[] = { "", "--crankshaft", "--expose-debug-as" };
+  CHECK_EQ(2, FlagList::SetFlagsFromCommandLine(&argc,
+                                                const_cast<char **>(argv),
+                                                true));
+  CHECK_NE(NULL, argv[1]);
+  CHECK_EQ(argc, 2);
+}