add compiler option to disable C code comment generation

Cython/Compiler/Code.py

@@ -1679,8 +1679,9 @@ class CCodeWriter(object):
         self.last_marked_pos = pos
         self.last_pos = None
         self.write("\n")
-        self.indent()
-        self.write("/* %s */\n" % self._build_marker(pos))
+        if Options.emit_code_comments:
+            self.indent()
+            self.write("/* %s */\n" % self._build_marker(pos))
         if trace and self.funcstate and self.funcstate.can_trace and self.globalstate.directives['linetrace']:
             self.indent()
             self.write('__Pyx_TraceLine(%d,%d,%s)\n' % (

Cython/Compiler/Options.py

@@ -10,6 +10,11 @@ from __future__ import absolute_import
 cache_builtins = True
 
 embed_pos_in_docstring = False
+
+# Copy the original source code line by line into C code comments
+# in the generated code file to help with understanding the output.
+emit_code_comments = True
+
 gcc_branch_hints = True
 
 pre_import = None