fix undefined variable 'context' in compile_multiple()

Cython/Compiler/Main.py

@@ -384,9 +384,10 @@ def create_default_resultobj(compilation_source, options):
         result.c_file = Utils.replace_suffix(source_desc.filename, c_suffix)
     return result
 
-def run_pipeline(source, options, full_module_name = None):
+def run_pipeline(source, options, full_module_name=None, context=None):
     import Pipeline
 
+    if context is None:
         context = options.create_context()
 
     # Set up source object
@@ -551,16 +552,20 @@ def compile_multiple(sources, options):
     if timestamps is None:
         timestamps = recursive
     verbose = options.verbose or ((recursive or timestamps) and not options.quiet)
+    context = None
     for source in sources:
         if source not in processed:
-            # Compiling multiple sources in one context doesn't quite
-            # work properly yet.
+            if context is None:
+                context = options.create_context()
             if not timestamps or context.c_file_out_of_date(source):
                 if verbose:
                     sys.stderr.write("Compiling %s\n" % source)
 
-                result = run_pipeline(source, options)
+                result = run_pipeline(source, options, context=context)
                 results.add(source, result)
+                # Compiling multiple sources in one context doesn't quite
+                # work properly yet.
+                context = None
             processed.add(source)
             if recursive:
                 for module_name in context.find_cimported_module_names(source):