cythonpp.py: fix breakage on newer cython versions

Thanks to @zhangchunlin and @mvalkon.

Fix #483. Close #489.

util/cythonpp.py

@@ -32,6 +32,11 @@ define_re = re.compile(r'^#define\s+([a-zA-Z_]\w*)(\((?:[^,)]+,)*[^,)]+\))?\s+(.
 # Conditional directive:
 condition_re = re.compile(r'^#(ifdef\s+.+|if\s+.+|else\s*|endif\s*)$')
 
+# cython header:
+cython_header_re = re.compile(r'^/\* (generated by cython [^\s*]+)[^*]+\*/$', re.I)
+#assert cython_header_re.match('/* Generated by Cython 0.21.1 */').group(1) == 'Generated by Cython 0.21.1'
+#assert cython_header_re.match('/* Generated by Cython 0.19 on 55-555-555 */').group(1) == 'Generated by Cython 0.19'
+
 
 def match_condition(line):
     line = line.strip()
@@ -557,9 +562,9 @@ def postprocess_cython_output(filename, banner):
     input = open(filename)
     firstline = input.readline()
 
-    if firstline.strip().lower().startswith('/* generated by cython ') and firstline.strip().endswith('*/'):
-        line = firstline.strip().split(' on ', 1)[0]
-        result.append(line + ' */')
+    m = cython_header_re.match(firstline.strip())
+    if m:
+        result.append('/* %s */' % m.group(1))
     else:
         result.append(firstline)