Merge pull request #509 from insertinterestingnamehere/define_macros

Allow passing define macros without specified values as commented directives

Cython/Build/Dependencies.py

@@ -209,7 +209,9 @@ class DistutilsInfo(object):
                     if type in (list, transitive_list):
                         value = parse_list(value)
                         if key == 'define_macros':
-                            value = [tuple(macro.split('=')) for macro in value]
+                            value = [tuple(macro.split('='))
+                                     if '=' in macro else (macro, None)
+                                     for macro in value]
                     self.values[key] = value
         elif exn is not None:
             for key in distutils_settings:

tests/run/define_macro.pyx

+#distutils: define_macros = DEFINE_NO_VALUE, DEFINE_WITH_VALUE=0
+
+cdef extern from "define_macro_helper.h" nogil:
+    int VAL;
+
+def test():
+    """
+    >>> test()
+    1
+    """
+    return VAL

tests/run/define_macro_helper.h

+#pragma once
+#ifdef DEFINE_NO_VALUE
+#define VAL (DEFINE_WITH_VALUE + 1)
+#else
+#define VAL DEFINE_WITH_VALUE
+#endif