[Not for commit] Experiment for windows build flag comparison.

tools/gyp_flag_compare.py

Index: tools/gyp_flag_compare.py
diff --git a/tools/gyp_flag_compare.py b/tools/gyp_flag_compare.py
index 86fa5c409840188f63fd76d41b5c2afea403c7c7..0b33a459ea874d0d0f6c0f7372abd11e15a27c9f 100755
--- a/tools/gyp_flag_compare.py
+++ b/tools/gyp_flag_compare.py
@@ -98,6 +98,9 @@ def GetFlags(lines, build_dir):
       assert len(rsp_file) <= 1
       if rsp_file:
         rsp_file = os.path.join(build_dir, rsp_file[0][1:])
+        if not os.path.exists(rsp_file):
+          print 'Warning: Skipping %s' % rsp_file
+          continue
         with open(rsp_file, "r") as open_rsp_file:
           command_line = shlex.split(open_rsp_file, posix=False)
 
@@ -185,10 +188,10 @@ def CompareLists(gyp, gn, name, dont_care_gyp=None, dont_care_gn=None):
   return output
 
 
-def Run(command_line):
+def Run(command_line, **kwargs):
   """Run |command_line| as a subprocess and return stdout. Raises on error."""
   try:
-    return subprocess.check_output(command_line, shell=True)
+    return subprocess.check_output(command_line, shell=True,**kwargs)
   except subprocess.CalledProcessError as e:
     # Rescue the output we got until the exception happened.
     print '#### Stdout: ####################################################'
@@ -197,6 +200,10 @@ def Run(command_line):
     raise
 
 
+def compile(build_type, src_dir):
+  args = "python -u E:/b/build/scripts/tools/runit.py --show-path python E:/b/build/scripts/slave/compile.py --build-args=-d --build-args=keeprsp --gsutil-py-path E:/b/build/scripts/slave/.recipe_deps/depot_tools/gsutil.py --ninja-path E:/b/build/scripts/slave/.recipe_deps/depot_tools/ninja.exe --target %s --src-dir %s --goma-cache-dir E:/b/build/slave/goma_cache --compiler goma --goma-service-account-json-file C:/creds/service_accounts/service-account-goma-client.json --goma-dir E:/b/build/slave/cache/cipd/goma --goma-fail-fast --goma-disable-local-fallback -- all".replace('/', '\\')
+  return Run(args % (build_type, src_dir))
+
 def main():
   if len(sys.argv) < 4:
     print ('usage: %s gn_outdir gyp_outdir gn_target '
@@ -206,20 +213,27 @@ def main():
   if len(sys.argv) == 4:
     sys.argv.append(sys.argv[3])
   gn_out_dir = sys.argv[1]
-  print >> sys.stderr, 'Expecting gn outdir in %s...' % gn_out_dir
-  gn = Run('ninja -C %s -t commands %s' % (gn_out_dir, sys.argv[3]))
+  gyp_out_dir = sys.argv[2]
+
+  build_type = os.path.basename(gyp_out_dir)
+  src_dir = os.path.dirname(os.path.dirname(gyp_out_dir))
+  print >> sys.stderr, 'Expecting gyp outdir in %s...' % gyp_out_dir
   if sys.platform == 'win32':
     # On Windows flags are stored in .rsp files which are created during build.
-    print >> sys.stderr, 'Building in %s...' % gn_out_dir
-    Run('ninja -C %s -d keeprsp %s' % (gn_out_dir, sys.argv[3]))
+    print >> sys.stderr, 'Building in %s...' % gyp_out_dir
+    # Run('ninja -C %s -d keeprsp %s' % (gyp_out_dir, " ".join(sys.argv[4:])))
+    compile(build_type, src_dir)
 
-  gyp_out_dir = sys.argv[2]
-  print >> sys.stderr, 'Expecting gyp outdir in %s...' % gyp_out_dir
   gyp = Run('ninja -C %s -t commands %s' % (gyp_out_dir, " ".join(sys.argv[4:])))
+
+  build_type = 'gn'
+  print >> sys.stderr, 'Expecting gn outdir in %s...' % gn_out_dir
   if sys.platform == 'win32':
     # On Windows flags are stored in .rsp files which are created during build.
-    print >> sys.stderr, 'Building in %s...' % gyp_out_dir
-    Run('ninja -C %s -d keeprsp %s' % (gyp_out_dir, " ".join(sys.argv[4:])))
+    print >> sys.stderr, 'Building in %s...' % gn_out_dir
+    # Run('ninja -C %s -d keeprsp %s' % (gn_out_dir, sys.argv[3]))
+    compile(build_type, src_dir)
+  gn = Run('ninja -C %s -t commands %s' % (gn_out_dir, sys.argv[3]))
 
   all_gyp_flags = GetFlags(gyp.splitlines(),
                            os.path.join(os.getcwd(), gyp_out_dir))