diff options
authorThomas Petazzoni <>2010-08-22 05:27:09 (GMT)
committer Thomas Petazzoni <>2010-09-01 12:22:28 (GMT)
commit0b36880085f0c65286877853caccf0bde2dd7f0b (patch)
parente1b1a18ab63ae3ef4eeb7f7cb4406a9cfbb12035 (diff)
Ensure that all config-related files are generated before the build
The previous commit has removed calls to conf_write_autoconf(), which is the function that generates the KCONFIG_AUTOCONF, KCONFIG_AUTOHEADER, KCONFIG_TRISTATE files and the split config (with one file per config item). Therefore, those things were not generated anymore before the build. In order to get them generated before the build, we use the same mechanism as the kernel: run a silentoldconfig when the .config file is newer than the KCONFIG_AUTOCONF file. In Buildroot, all those elements are not really used today, except the split config which is used a little bit in the toolchain build, in a try to make sure the toolchain gets rebuilt properly when the configuration changes. It does not seem that this work has been completed. However, as we want to keep the same behaviour as previously, we have to generate all those elements before starting the build. Signed-off-by: Thomas Petazzoni <>
1 files changed, 12 insertions, 7 deletions
diff --git a/Makefile b/Makefile
index c897db7..9cc3c7a 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,7 @@ CONFIG=package/config
DATE:=$(shell date +%Y%m%d)
noconfig_targets:=menuconfig nconfig gconfig xconfig config oldconfig randconfig \
- defconfig %_defconfig savedefconfig allyesconfig allnoconfig release \
+ defconfig %_defconfig savedefconfig allyesconfig allnoconfig silentoldconfig release \
randpackageconfig allyespackageconfig allnopackageconfig \
source-check help
@@ -322,17 +322,17 @@ TARGETS_ALL:=$(patsubst %,__real_tgt_%,$(TARGETS))
# all targets depend on the crosscompiler and it's prerequisites
$(TARGETS_ALL): __real_tgt_%: $(BASE_TARGETS) %
-$(BR2_DEPENDS_DIR): $(CONFIG_DIR)/.config
-# rm -rf $@
-# mkdir -p $(@D)
-# cp -dpRf $(CONFIG)/buildroot-config $@
-world: dependencies dirs $(BASE_TARGETS) $(TARGETS_ALL)
+$(BUILD_DIR)/buildroot-config/auto.conf: $(CONFIG_DIR)/.config
+ $(MAKE) $(EXTRAMAKEARGS) silentoldconfig
+prepare: $(BUILD_DIR)/buildroot-config/auto.conf
+world: prepare dependencies dirs $(BASE_TARGETS) $(TARGETS_ALL)
.PHONY: all world dirs clean distclean source \
@@ -468,6 +468,7 @@ $(BUILD_DIR)/buildroot-config/%onf:
KCONFIG_AUTOCONFIG=$(BUILD_DIR)/buildroot-config/auto.conf \
KCONFIG_AUTOHEADER=$(BUILD_DIR)/buildroot-config/autoconf.h \
+ KCONFIG_TRISTATE=$(BUILD_DIR)/buildroot-config/tristate.config \
xconfig: $(BUILD_DIR)/buildroot-config/qconf
@@ -539,6 +540,10 @@ allnopackageconfig: $(BUILD_DIR)/buildroot-config/conf
$< --allnoconfig $(CONFIG_CONFIG_IN)
@rm -f $(CONFIG_DIR)/.config.nopkg
+silentoldconfig: $(BUILD_DIR)/buildroot-config/conf
+ @mkdir -p $(BUILD_DIR)/buildroot-config
+ $(COMMON_CONFIG_ENV) $< --silentoldconfig $(CONFIG_CONFIG_IN)
defconfig: $(BUILD_DIR)/buildroot-config/conf
@mkdir -p $(BUILD_DIR)/buildroot-config