1 files changed, 10 insertions, 2 deletions
diff --git a/tools/shared.py b/tools/shared.py
index 72f4868e..7692b4f8 100644
--- a/tools/shared.py
+++ b/tools/shared.py
@@ -2,6 +2,7 @@ import shutil, time, os, sys, json, tempfile, copy, shlex, atexit, subprocess, h
 from subprocess import Popen, PIPE, STDOUT
 from tempfile import mkstemp
 import jsrun, cache, tempfiles
+from response_file import create_response_file
 
 def listify(x):
   if type(x) is not list: return [x]
@@ -34,13 +35,20 @@ class WindowsPopen:
         self.stdout_ = PIPE
       if self.stderr_ == None:
         self.stderr_ = PIPE
-  
-    # Call the process with fixed streams.
+
+    # emscripten.py supports reading args from a response file instead of cmdline.
+    # Use .rsp to avoid cmdline length limitations on Windows.
+    if len(args) >= 2 and args[1].endswith("emscripten.py"):
+      response_filename = create_response_file(args[2:], TEMP_DIR)
+      args = args[0:2] + [response_filename]
+      
     try:
+      # Call the process with fixed streams.
       self.process = subprocess.Popen(args, bufsize, executable, self.stdin_, self.stdout_, self.stderr_, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags)
     except Exception, e:
       print >> sys.stderr, '\nsubprocess.Popen(args=%s) failed! Exception %s\n' % (' '.join(args), str(e))
       raise e
+      raise
 
   def communicate(self, input=None):
     output = self.process.communicate(input)