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support/kconfig: add support for olddefconfig

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olddefconfig is a new target available in kconfig that allows to take
an old .config file, and update it to the latest version of the code,
without being asked for questions: it automatically assumes the
default value for options whose value was not defined.

It for example allows to take a minimal defconfig, copy it as .config,
and do 'make olddefconfig' to get the full .config.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Tested-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Thomas Petazzoni 2013-04-04 11:24:25 +00:00 committed by Peter Korsgaard
parent 6997e461fd
commit 9db3b47ea1
1 changed files with 7 additions and 1 deletions
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8
Makefile
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@ -58,7 +58,7 @@ export BR2_VERSION_FULL:=$(BR2_VERSION)$(shell $(TOPDIR)/support/scripts/setloca
noconfig_targets:=menuconfig nconfig gconfig xconfig config oldconfig randconfig \
%_defconfig allyesconfig allnoconfig silentoldconfig release \
randpackageconfig allyespackageconfig allnopackageconfig \
source-check print-version
source-check print-version olddefconfig
# Strip quotes and then whitespaces
qstrip=$(strip $(subst ",,$(1)))
@ -693,6 +693,10 @@ silentoldconfig: $(BUILD_DIR)/buildroot-config/conf outputmakefile
@mkdir -p $(BUILD_DIR)/buildroot-config
$(COMMON_CONFIG_ENV) $< --silentoldconfig $(CONFIG_CONFIG_IN)
olddefconfig: $(BUILD_DIR)/buildroot-config/conf outputmakefile
@mkdir -p $(BUILD_DIR)/buildroot-config
$(COMMON_CONFIG_ENV) $< --olddefconfig $(CONFIG_CONFIG_IN)
defconfig: $(BUILD_DIR)/buildroot-config/conf outputmakefile
@mkdir -p $(BUILD_DIR)/buildroot-config
@$(COMMON_CONFIG_ENV) $< --defconfig$(if $(DEFCONFIG),=$(DEFCONFIG)) $(CONFIG_CONFIG_IN)
@ -758,6 +762,8 @@ help:
@echo ' xconfig - interactive Qt-based configurator'
@echo ' gconfig - interactive GTK-based configurator'
@echo ' oldconfig - resolve any unresolved symbols in .config'
@echo ' silentoldconfig - Same as oldconfig, but quietly, additionally update deps'
@echo ' olddefconfig - Same as silentoldconfig but sets new symbols to their default value'
@echo ' randconfig - New config with random answer to all options'
@echo ' defconfig - New config with default answer to all options'
@echo ' BR2_DEFCONFIG, if set, is used as input'