show warning if using emscripten.py directly

1 files changed, 8 insertions, 1 deletions

diff --git a/emscripten.py b/emscripten.py
index 93df8823..5674c33a 100755
--- a/emscripten.py
+++ b/emscripten.py
@@ -15,8 +15,15 @@ import os
 import subprocess
 import re
 import sys
-from tools import shared
 
+if not os.environ.get('EMSCRIPTEN_SUPPRESS_USAGE_WARNING'):
+  print >> sys.stderr, '''
+==============================================================
+WARNING: You should normally never use this! Use emcc instead.
+==============================================================
+  '''
+
+from tools import shared
 
 __rootpath__ = os.path.abspath(os.path.dirname(__file__))
 def path_from_root(*pathelems):