fix macro with empy args

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@6751 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/test-suite/preproc.i

@@ -266,7 +266,7 @@ inline const char* mangle ## #@__VA_ARGS__ () {
 #define THREE(FOO) 3
 
 #define one ONE
-#define two TWO
+#define two TWO()
 #define three THREE(42)
 
 

SWIG/Examples/test-suite/python/preproc_runme.py

@@ -8,3 +8,7 @@ if preproc.define != 1:
 
 if preproc.defined != 1:
   raise RuntimeError
+
+if 2*preproc.one != preproc.two:
+  raise RuntimeError
+

SWIG/Source/Preprocessor/cpp.c

@@ -618,7 +618,7 @@ expand_macro(String_or_char *name, List *args)
   }
 
   /* If the macro expects arguments, but none were supplied, we leave it in place */
-  if (!args && (margs)) {
+  if (!args && (margs) && Len(margs) > 0) {
     return NewString(name);
   }