[Buildroot] [PATCH 2 of 5 RFC] uclibc: update-config: preserve freshly configured settings

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

In the sequence:

make uclibc-menuconfig
make uclibc-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 'uclibc-update-config' no longer needs the
toolchain to be available, which makes:
    make clean uclibc-menuconfig uclibc-update-config
much faster and user-friendly.

Fixes bug #7154 https://bugs.busybox.net/show_bug.cgi?id=7154

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

---
 package/uclibc/uclibc.mk |  9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff -r 97d74ccbe054 -r 62a7dd35bfbf package/uclibc/uclibc.mk
--- a/package/uclibc/uclibc.mk	Sun Jun 22 10:37:22 2014 +0200
+++ b/package/uclibc/uclibc.mk	Mon Jun 16 20:18:23 2014 +0200
@@ -554,11 +554,16 @@
 		DEVEL_PREFIX=/usr/ \
 		RUNTIME_PREFIX=$(STAGING_DIR)/ \
 		menuconfig
-	rm -f $(UCLIBC_DIR)/.stamp_{configured,built,target_installed,staging_installed}
+	rm -f $(UCLIBC_DIR)/.stamp_{config_file_fixed,configured,built}
+	rm -f $(UCLIBC_DIR)/.stamp_{target_installed,staging_installed}
 
 $(eval $(generic-package))
 
-uclibc-update-config: $(UCLIBC_DIR)/.stamp_configured
+$(UCLIBC_DIR)/.stamp_config_file_fixed:
+	$(UCLIBC_SETUP_DOT_CONFIG)
+	touch $@
+
+uclibc-update-config: $(UCLIBC_DIR)/.stamp_config_file_fixed
 	cp -f $(UCLIBC_DIR)/.config $(UCLIBC_CONFIG_FILE)
 
 # Before uClibc is built, we must have the second stage cross-compiler