Add warning to cctest when running multiple tests in sequence.

test/cctest/cctest.cc

 // Copyright 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 88 matching lines @@
 
 
 class CcTestArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
   virtual void* Allocate(size_t length) { return malloc(length); }
   virtual void Free(void* data, size_t length) { free(data); }
   // TODO(dslomov): Remove when v8:2823 is fixed.
   virtual void Free(void* data) { UNREACHABLE(); }
 };
 
 
+static void SuggestTestHarness(int tests) {
+  if (tests == 0) return;
+  printf("Running multiple tests in sequence is deprecated and may cause "
+         "bogus failure.  Consider using tools/run-tests.py instead.\n");
+}
+
+
 int main(int argc, char* argv[]) {
   v8::internal::FlagList::SetFlagsFromCommandLine(&argc, argv, true);
   v8::internal::FLAG_harmony_array_buffer = true;
   v8::internal::FLAG_harmony_typed_arrays = true;
 
   CcTestArrayBufferAllocator array_buffer_allocator;
   v8::V8::SetArrayBufferAllocator(&array_buffer_allocator);
 
   CcTest::set_default_isolate(v8::Isolate::GetCurrent());
   CHECK(CcTest::default_isolate() != NULL);
@@ skipping 12 matching lines @@
         // Split the string in two by nulling the slash and then run
         // exact matches.
         *testname = 0;
         char* file = arg_copy;
         char* name = testname + 1;
         CcTest* test = CcTest::last();
         while (test != NULL) {
           if (test->enabled()
               && strcmp(test->file(), file) == 0
               && strcmp(test->name(), name) == 0) {
+            SuggestTestHarness(tests_run++);
             test->Run();
-            tests_run++;
           }
           test = test->prev();
         }
 
       } else {
         // Run all tests with the specified file or test name.
         char* file_or_name = arg_copy;
         CcTest* test = CcTest::last();
         while (test != NULL) {
           if (test->enabled()
               && (strcmp(test->file(), file_or_name) == 0
                   || strcmp(test->name(), file_or_name) == 0)) {
+            SuggestTestHarness(tests_run++);
             test->Run();
-            tests_run++;
           }
           test = test->prev();
         }
       }
       v8::internal::DeleteArray<char>(arg_copy);
     }
   }
   if (print_run_count && tests_run != 1)
     printf("Ran %i tests.\n", tests_run);
   v8::V8::Dispose();
   return 0;
 }
 
 RegisterThreadedTest *RegisterThreadedTest::first_ = NULL;
 int RegisterThreadedTest::count_ = 0;