1 files changed, 8 insertions, 5 deletions
diff --git a/pp2cc.py b/pp2cc.py
index 9de64dd..4c83afb 100755
--- a/pp2cc.py
+++ b/pp2cc.py
@@ -243,10 +243,7 @@ class Parse(object):
         if name in self.functions:
             function = self.functions[name]
             return function.labelBegin()
-        # name not found :? perhaps an external declaration
-        lbl = "fn_" + name
-        self.logger.warning("call to undefined function, assuming label '{}'".format(lbl))
-        return lbl
+        return None
 
     def parseCompound(self, linked_node):
         linked_node.incrementLevel()
@@ -749,7 +746,13 @@ class Parse(object):
                 lines += line
                 lines.append(self.asm.push(result_reg))
 
-        lines.append(self.asm.branch_op("BRS", self.functionLabel(funcname)))
+        lbl_func = self.functionLabel(funcname)
+        if lbl_func is None:
+            # name not found :? perhaps an external declaration
+            lbl = "fn_" + funcname
+            self.logger.warning("call to undefined function, assuming label"
+                                " '{}'".format(lbl), linked_node=linked_node)
+        lines.append(self.asm.branch_op("BRS", lbl_func))
 
         if params:
             lines.append(self.asm.binary_op("ADD", "SP", len(params.exprs)))