From 4db6f0721cae6a6242a4cd34091485d6d4b38446 Mon Sep 17 00:00:00 2001
From: Angus Gratton <angus@espressif.com>
Date: Mon, 19 Aug 2019 11:42:39 +1000
Subject: [PATCH] kconfig: Add -MP option so .d files include empty targets

Prevents make-level errors when switching IDF versions, as headers may be removed.

Similar to some mentioned here:
https://github.com/espressif/esp-idf/issues/712
---
 tools/kconfig/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/kconfig/Makefile b/tools/kconfig/Makefile
index 19960a665..232aabd40 100644
--- a/tools/kconfig/Makefile
+++ b/tools/kconfig/Makefile
@@ -165,7 +165,7 @@ check-lxdialog  := $(SRCDIR)/lxdialog/check-lxdialog.sh
 # Use recursively expanded variables so we do not call gcc unless
 # we really need to do so. (Do not call gcc as part of make mrproper)
 CFLAGS += $(shell $(CONFIG_SHELL) $(check-lxdialog) -ccflags) \
-                    -DLOCALE -MD
+                    -DLOCALE -MMD -MP
 
 %.o: $(SRCDIR)/%.c
 	$(CC) -c $(CFLAGS) $(CPPFLAGS) $< -o $@