Make multiple '--directive's on command line cumulative

Cython/Compiler/CmdLine.py

@@ -116,7 +116,9 @@ def parse_command_line(args):
                 options.emit_linenums = True
             elif option in ("-X", "--directive"):
                 try:
-                    options.compiler_directives = Options.parse_directive_list(pop_arg(), relaxed_bool=True)
+                    options.compiler_directives = Options.parse_directive_list(
+                        pop_arg(), relaxed_bool=True,
+                        current_settings=options.compiler_directives)
                 except ValueError, e:
                     sys.stderr.write("Error in compiler directive: %s\n" % e.args[0])
                     sys.exit(1)

Cython/Compiler/Options.py

@@ -129,7 +129,8 @@ def parse_directive_value(name, value, relaxed_bool=False):
     else:
         assert False
 
-def parse_directive_list(s, relaxed_bool=False, ignore_unknown=False):
+def parse_directive_list(s, relaxed_bool=False, ignore_unknown=False,
+                         current_settings=None):
     """
     Parses a comma-separated list of pragma options. Whitespace
     is not considered.
@@ -152,7 +153,10 @@ def parse_directive_list(s, relaxed_bool=False, ignore_unknown=False):
        ...
     ValueError: Unknown option: "unknown"
     """
-    result = {}
+    if current_settings is None:
+        result = {}
+    else:
+        result = current_settings
     for item in s.split(','):
         item = item.strip()
         if not item: continue