From b64c96124124b22601d01af038b258c58deb81c8 Mon Sep 17 00:00:00 2001
From: Ulf Magnusson <ulfalizer@gmail.com>
Date: Mon, 24 Dec 2018 20:42:56 +0100
Subject: Warn for '# CONFIG_FOO is not set' when FOO is referenced but
 undefined

Due to an oversight, '# CONFIG_FOO is not set' with FOO undefined only
triggered a warning about assigning an undefined symbol if FOO was never
referenced inside the Kconfig files.
---
 kconfiglib.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kconfiglib.py b/kconfiglib.py
index f61b793..0acb65e 100644
--- a/kconfiglib.py
+++ b/kconfiglib.py
@@ -1229,6 +1229,10 @@ class Kconfig(object):
                         continue
 
                     sym = syms[name]
+                    if not sym.nodes:
+                        self._undef_assign(name, "n", filename, linenr)
+                        continue
+
                     if sym.orig_type not in _BOOL_TRISTATE:
                         continue
 
-- 
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