Enable no-compile tests on Windows

tools/nocompile_driver.py

Index: tools/nocompile_driver.py
diff --git a/tools/nocompile_driver.py b/tools/nocompile_driver.py
index 598e4130f6fe96cf6b88926a2220387e249d501a..fb6b5a169a570f0cf62eaf5d94296073586b09d9 100755
--- a/tools/nocompile_driver.py
+++ b/tools/nocompile_driver.py
@@ -212,16 +212,24 @@ def StartTest(sourcefile_path, cflags, config):
         }
   """
   # TODO(ajwong): Get the compiler from gyp.
-  cmdline = [os.path.join(os.path.dirname(os.path.realpath(__file__)),
-                          '../third_party/llvm-build/Release+Asserts/bin',
-                          'clang++')]
+  llvm_path = os.path.join(
+      os.path.dirname(os.path.realpath(__file__)),
+      '..', 'third_party', 'llvm-build', 'Release+Asserts', 'bin')
+  if os.name == 'nt':
+    clang = os.path.join(llvm_path, 'clang-cl.exe')
+  else:
+    clang = os.path.join(llvm_path, 'clang++')
+  cmdline = [clang]
   cmdline.extend(shlex.split(cflags))
   name = config['name']
   expectations = config['expectations']
   if expectations is not None:
     cmdline.append('-D%s' % name)
-  cmdline.extend(['-std=c++11', '-o', '/dev/null', '-c', '-x', 'c++',
-                  sourcefile_path])
+  if os.name == 'nt':
+    cmdline.extend(['/TP', '/c', sourcefile_path])
+  else:
+    cmdline.extend(['-std=c++11', '-o', '/dev/null', '-c', '-x', 'c++',
+                    sourcefile_path])
 
   process = subprocess.Popen(cmdline, stdout=subprocess.PIPE,
                              stderr=subprocess.PIPE)
@@ -374,7 +382,11 @@ def CompleteAtLeastOneTest(executing_tests):
     read_set = []
     for test in executing_tests.values():
       read_set.extend([test['proc'].stderr, test['proc'].stdout])
-    select.select(read_set, [], read_set, NCTEST_TERMINATE_TIMEOUT_SEC)
+    if os.name == 'nt':
+      # select cannot handle pipes on Windows.
+      time.sleep(0.1)
+    else:
+      select.select(read_set, [], read_set, NCTEST_TERMINATE_TIMEOUT_SEC)
 
     # Now attempt to process results.
     now = time.time()
@@ -433,9 +445,13 @@ def main():
   executing_tests = {}
   finished_tests = []
 
+  cflags_extra = ''
+  if os.name != 'nt':
+    cflags_extra = ' -MMD -MF %s.d -MT %s' % (resultfile_path, resultfile_path)
+
   test = StartTest(
       sourcefile_path,
-      cflags + ' -MMD -MF %s.d -MT %s' % (resultfile_path, resultfile_path),
+      cflags + cflags_extra,
       { 'name': 'NCTEST_SANITY',
         'suite_name': suite_name,
         'expectations': None,