[Buildroot] [PATCH 3 of 3 v3] uclibc: update-config: preserve freshly configured settings

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear Thomas De Schampheleire,

On Fri, 18 Jul 2014 20:54:56 +0200, Thomas De Schampheleire wrote:

> diff -r 29ba03b43b12 -r f8c110cf3b83 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
> @@ -432,7 +432,6 @@
>  endef
>  
>  define UCLIBC_CONFIGURE_CMDS
> -	$(UCLIBC_FIXUP_DOT_CONFIG)
>  	$(MAKE1) -C $(UCLIBC_DIR) \
>  		$(UCLIBC_MAKE_FLAGS) \
>  		PREFIX=$(STAGING_DIR) \
> @@ -537,7 +536,11 @@
>  $(UCLIBC_DIR)/.config: $(UCLIBC_CONFIG_FILE) | uclibc-patch
>  	$(INSTALL) -m 0644 $(UCLIBC_CONFIG_FILE) $(UCLIBC_DIR)/.config
>  
> -$(UCLIBC_TARGET_CONFIGURE): $(UCLIBC_DIR)/.config
> +$(UCLIBC_DIR)/.stamp_config_fixup_done: $(UCLIBC_DIR)/.config
> +	$(UCLIBC_FIXUP_DOT_CONFIG)
> +	$(Q)touch $@
> +
> +$(UCLIBC_TARGET_CONFIGURE): $(UCLIBC_DIR)/.stamp_config_fixup_done
>  
>  uclibc-menuconfig: $(UCLIBC_DIR)/.config
>  	$(MAKE1) -C $(UCLIBC_DIR) \
> @@ -546,9 +549,10 @@
>  		DEVEL_PREFIX=/usr/ \
>  		RUNTIME_PREFIX=$(STAGING_DIR)/ \
>  		menuconfig
> -	rm -f $(UCLIBC_DIR)/.stamp_{configured,built,target_installed,staging_installed}
> +	rm -f $(UCLIBC_DIR)/.stamp_{config_fixup_done,configured,built}
> +	rm -f $(UCLIBC_DIR)/.stamp_{target,staging}_installed
>  
> -uclibc-update-config: $(UCLIBC_DIR)/.stamp_configured
> +uclibc-update-config: $(UCLIBC_DIR)/.stamp_config_fixup_done
>  	cp -f $(UCLIBC_DIR)/.config $(UCLIBC_CONFIG_FILE)

Is a separate stamp file actually needed here? This patch changes all
references to $(UCLIBC_DIR)/.config as dependencies to references to
$(UCLIBC_DIR)/.stamp_config_fixup_done as a dependency, and
$(UCLIBC_DIR)/.stamp_config_fixup_done is the only target left having a
dependency on $(UCLIBC_DIR)/.config. So what prevents from doing:

$(UCLIBC_DIR)/.config: $(UCLIBC_CONFIG_FILE) | uclibc-patch
	$(INSTALL) -m 0644 $(UCLIBC_CONFIG_FILE) $(UCLIBC_DIR)/.config
	$(UCLIBC_FIXUP_DOT_CONFIG)

 ?

I'm probably missing one use case, but I find
this .stamp_config_fixup_done stamp file not so nice, so I'd like to
really understand why it's needed.

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com