avoid stack overflow

ChangeLog

@@ -1,3 +1,10 @@
+2024-11-22 Richard Frith-Macdonald <[email protected]>
+
+	* Tools/AGSIndex: (-makeRefs:) process child nodes in loop rather
+	than recursively ... reduces the depth of recursion to the depth of
+	nesting children rather than the number of children, avoiding stack
+	overflow  for large projects.
+
 2024-11-21 Richard Frith-Macdonald <[email protected]>
 
 	* NSRegularExpression: avoid leaks in ICU code by calling more

Tools/AGSIndex.m

@@ -291,7 +291,6 @@ - (id) init
 - (void) makeRefs: (GSXMLNode*)node
 {
   GSXMLNode	*children = [node firstChild];
-  GSXMLNode	*next = [node next];
   BOOL		newUnit = NO;
 
   if ([node type] == XML_ELEMENT_NODE)
@@ -541,20 +540,17 @@ - (void) makeRefs: (GSXMLNode*)node
 	}
     }
 
-  if (children != nil)
+  while (children)
     {
       [self makeRefs: children];
+      children = [children next];
     }
   if (newUnit == YES)
     {
       unit = nil;
       category = nil;
       classname = nil;
     }
-  if (next != nil)
-    {
-      [self makeRefs: next];
-    }
 }
 
 /**