[Buildroot] [PATCH 5 of 5 RFC] busybox: update-config: preserve freshly configured settings

[Thomas De Schampheleire <patrickdepinguin@gmail.com>]

In the sequence:

make busybox-menuconfig
make busybox-update-config

the freshly configured settings from the menuconfig are lost during the
update-config step. This is because update-config depends on the configure
step, which starts by copying the config file to the build directory.

Instead, stop depending on the configure step from update-config, and
explicitly call the needed commands before actually copying the config file.

This has the added bonus that 'busybox-update-config' no longer needs the
toolchain to be available, which makes:
    make clean busybox-menuconfig busybox-update-config
much faster and user-friendly.

This is a corrolary of bug #7154 https://bugs.busybox.net/show_bug.cgi?id=7154

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>

---
 package/busybox/busybox.mk |  27 ++++++++++++++++++---------
 1 files changed, 18 insertions(+), 9 deletions(-)

diff -r 5dc5438c0108 -r 7e80ee0110a2 package/busybox/busybox.mk
--- a/package/busybox/busybox.mk	Sun Jun 22 15:33:49 2014 +0200
+++ b/package/busybox/busybox.mk	Sun Jun 22 10:34:06 2014 +0200
@@ -189,14 +189,7 @@
 endef
 endif
 
-# Enable "noclobber" in install.sh, to prevent BusyBox from overwriting any
-# full-blown versions of apps installed by other packages with sym/hard links.
-define BUSYBOX_NOCLOBBER_INSTALL
-	$(SED) 's/^noclobber="0"$$/noclobber="1"/' $(@D)/applets/install.sh
-endef
-
-define BUSYBOX_CONFIGURE_CMDS
-	$(BUSYBOX_COPY_CONFIG)
+define BUSYBOX_SETUP_CONFIG
 	$(BUSYBOX_SET_MMU)
 	$(BUSYBOX_SET_LARGEFILE)
 	$(BUSYBOX_SET_IPV6)
@@ -208,6 +201,17 @@
 	$(BUSYBOX_INTERNAL_SHADOW_PASSWORDS)
 	$(BUSYBOX_SET_INIT)
 	$(BUSYBOX_SET_WATCHDOG)
+endef
+
+# Enable "noclobber" in install.sh, to prevent BusyBox from overwritting any
+# full-blown versions of apps installed by other packages with sym/hard links.
+define BUSYBOX_NOCLOBBER_INSTALL
+	$(SED) 's/^noclobber="0"$$/noclobber="1"/' $(@D)/applets/install.sh
+endef
+
+define BUSYBOX_CONFIGURE_CMDS
+	$(BUSYBOX_COPY_CONFIG)
+	$(BUSYBOX_SETUP_CONFIG)
 	@yes "" | $(MAKE) ARCH=$(KERNEL_ARCH) CROSS_COMPILE="$(TARGET_CROSS)" \
 		-C $(@D) oldconfig
 	$(BUSYBOX_NOCLOBBER_INSTALL)
@@ -235,8 +239,13 @@
 	$(BUSYBOX_COPY_CONFIG)
 	$(BUSYBOX_MAKE_ENV) $(MAKE) $(BUSYBOX_MAKE_OPTS) -C $(BUSYBOX_DIR) \
 		$(subst busybox-,,$@)
+	rm -f $(BUSYBOX_DIR)/.stamp_config_file_fixed
 	rm -f $(BUSYBOX_DIR)/.stamp_built
 	rm -f $(BUSYBOX_DIR)/.stamp_target_installed
 
-busybox-update-config: busybox-configure
+$(BUSYBOX_DIR)/.stamp_config_file_fixed:
+	$(BUSYBOX_SETUP_CONFIG)
+	touch $@
+
+busybox-update-config: $(BUSYBOX_DIR)/.stamp_config_file_fixed
 	cp -f $(BUSYBOX_BUILD_CONFIG) $(BUSYBOX_CONFIG_FILE)