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.

1 files changed, 4 insertions, 0 deletions

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