Add no-variants option to test runner.

tools/run-tests.py

 #!/usr/bin/env python
 #
 # Copyright 2012 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
@@ skipping 107 matching lines @@
   result.add_option("--no-network", "--nonetwork",
                     help="Don't distribute tests on the network",
                     default=(utils.GuessOS() != "linux"),
                     dest="no_network", action="store_true")
   result.add_option("--no-presubmit", "--nopresubmit",
                     help='Skip presubmit checks',
                     default=False, dest="no_presubmit", action="store_true")
   result.add_option("--no-stress", "--nostress",
                     help="Don't run crankshaft --always-opt --stress-op test",
                     default=False, dest="no_stress", action="store_true")
+  result.add_option("--no-variants", "--novariants",
+                    help="Don't run any testing variants",
+                    default=False, dest="no_variants", action="store_true")
   result.add_option("--outdir", help="Base directory with compile output",
                     default="out")
   result.add_option("-p", "--progress",
                     help=("The style of progress indicator"
                           " (verbose, dots, color, mono)"),
                     choices=progress.PROGRESS_INDICATORS.keys(), default="mono")
   result.add_option("--report", help="Print a summary of the tests to be run",
                     default=False, action="store_true")
   result.add_option("--shard-count",
                     help="Split testsuites into this number of shards",
@@ skipping 52 matching lines @@
     options.no_presubmit = True
     options.no_network = True
   if options.command_prefix:
     print("Specifying --command-prefix disables network distribution, "
           "running tests locally.")
     options.no_network = True
   options.command_prefix = shlex.split(options.command_prefix)
   options.extra_flags = shlex.split(options.extra_flags)
   if options.j == 0:
     options.j = multiprocessing.cpu_count()
+
+  def excl(*args):
+    """Returns true if zero or one of multiple arguments are true."""
+    return reduce(lambda x, y: x + y, args) <= 1
+
+  if not excl(options.no_stress, options.stress_only, options.no_variants):
+    print "Use only one of --no-stress, --stress-only or --no-variants."
+    return False
   if options.no_stress:
     VARIANT_FLAGS = [[], ["--nocrankshaft"]]
+  if options.no_variants:
+    VARIANT_FLAGS = [[]]
   if not options.shell_dir:
     if options.shell:
       print "Warning: --shell is deprecated, use --shell-dir instead."
       options.shell_dir = os.path.dirname(options.shell)
   if options.stress_only:
     VARIANT_FLAGS = [["--stress-opt", "--always-opt"]]
   if options.valgrind:
     run_valgrind = os.path.join("tools", "run-valgrind.py")
     # This is OK for distributed running, so we don't need to set no_network.
     options.command_prefix = (["python", "-u", run_valgrind] +
@@ skipping 179 matching lines @@
   except KeyboardInterrupt:
     return 1
 
   if options.time:
     verbose.PrintTestDurations(suites, overall_duration)
   return exit_code
 
 
 if __name__ == "__main__":
   sys.exit(Main())