From 33b876306db2272c77e8e14e82758178aec96090 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Tue, 7 Jun 2016 08:58:48 -0600
Subject: [PATCH] preconfig target only executes if .config file changes

---
 Makefile | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 3f527d6cb..fc6fed558 100644
--- a/Makefile
+++ b/Makefile
@@ -78,12 +78,17 @@ BIN = libapps$(LIBEXT)
 all: $(BIN)
 .PHONY: import install context context_serialize context_rest .depdirs preconfig depend clean distclean
 
+define MAKE_template
+	$(Q) $(MAKE) -C $(1) $(2) TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" BIN_DIR="$(BIN_DIR)"
+
+endef
+
 define SDIR_template
 $(1)_$(2):
 	$(Q) $(MAKE) -C $(1) $(2) TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)" BIN_DIR="$(BIN_DIR)"
+
 endef
 
-$(foreach SDIR, $(BUILDIRS), $(eval $(call SDIR_template,$(SDIR),preconfig)))
 $(foreach SDIR, $(CONFIGURED_APPS), $(eval $(call SDIR_template,$(SDIR),all)))
 $(foreach SDIR, $(CONFIGURED_APPS), $(eval $(call SDIR_template,$(SDIR),install)))
 $(foreach SDIR, $(CONFIGURED_APPS), $(eval $(call SDIR_template,$(SDIR),context)))
@@ -116,7 +121,7 @@ context: context_serialize
 $(TOPDIR)/.config:
 
 Kconfig: $(TOPDIR)/.config
-	$(foreach SDIR, $(BUILDIRS), $(SDIR)_preconfig)
+	$(foreach SDIR, $(BUILDIRS), $(call MAKE_template,$(SDIR),preconfig))
 	$(Q) $(MKKCONFIG)
 
 preconfig: Kconfig