Add dependency to .conf.mk on .target in Makefile

If .target file is changed (=target changed), makefile configuration
should been regenerated.

2 files changed, 9 insertions, 3 deletions

diff --git a/Makefile b/Makefile
index d1bba9a..54c4236 100644
--- a/Makefile
+++ b/Makefile
@@ -99,9 +99,12 @@ distclean_buildroot:
 
 #######################################
 
-.conf.mk: conf.py
+.conf.mk: conf.py .target
 	scripts/confmk.py
 
+.target:
+	$(error Please select target by writing it to .target file)
+
 parse_kconfig:
 	@if [ `$(MAKE) -C scripts/parse_kconfig/ -q; echo $$?` != "0" ]; then \
 	$(MAKE) -C scripts/parse_kconfig/; fi
diff --git a/conf.py b/conf.py
index b8204cb..eb8e7ac 100644
--- a/conf.py
+++ b/conf.py
@@ -1,4 +1,5 @@
 import os
+import sys
 import re
 import importlib.machinery
 
@@ -126,6 +127,8 @@ if os.path.isfile(os.path.join(absroot, '.target')):
 			if not re.match('__*__', name):
 				vars()[name] = vars(ovconf)[name]
 	else:
-		print("W: No target specifier. Write target to .target file.")
+		print("E: Invalid target specifier. Write valid target to .target file.")
+		sys.exit(-99)
 else:
-	print("W: No target specifier. Write target to .target file.")
+	print("E: No target specifier. Write target to .target file.")
+	sys.exit(-99)