*config: improve handling of BR2_LEGACY

In 8a46d4bf1f the randpackageconfig and allpackageyesconfig were
extended with disabling all the legacy options, otherwise the resulting
config couldn't be built. However, that didn't work for randconfig and
allyesconfig.

This commit reverts 8a46d4bf1f and replaces it with a different
approach: skipping of the legacy config options is passed explicitly
through the environment variable SKIP_LEGACY, which forces
BR2_SKIP_LEGACY to y. The new option BR2_SKIP_LEGACY completely
disables the legacy handling, which effectively removes all the legacy
options from the .config.

However, in that case no values are set for the legacy options so a
subsequent oldconfig will query them. Therefore, run an additional
olddefconfig.

[Peter: fix s/BR2_LEGACY/SKIP_LEGACY/ typo]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
[yann.morin.1998@free.fr: do not rely on a user-visible option, works
 perfectly well with only blind options set from the environment]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
diff --git a/Makefile b/Makefile
index 5f9a2c3..f011918 100644
--- a/Makefile
+++ b/Makefile
@@ -696,7 +696,8 @@
 	KCONFIG_AUTOHEADER=$(BUILD_DIR)/buildroot-config/autoconf.h \
 	KCONFIG_TRISTATE=$(BUILD_DIR)/buildroot-config/tristate.config \
 	BR2_CONFIG=$(BR2_CONFIG) \
-	BR2_EXTERNAL=$(BR2_EXTERNAL)
+	BR2_EXTERNAL=$(BR2_EXTERNAL) \
+	SKIP_LEGACY=
 
 xconfig: $(BUILD_DIR)/buildroot-config/qconf outputmakefile
 	@mkdir -p $(BUILD_DIR)/buildroot-config
@@ -718,51 +719,56 @@
 	@mkdir -p $(BUILD_DIR)/buildroot-config
 	@$(COMMON_CONFIG_ENV) $< $(CONFIG_CONFIG_IN)
 
+# For the config targets that automatically select options, we pass
+# SKIP_LEGACY=y to disable the legacy options. However, in that case
+# no values are set for the legacy options so a subsequent oldconfig
+# will query them. Therefore, run an additional olddefconfig.
+
 oldconfig: $(BUILD_DIR)/buildroot-config/conf outputmakefile
 	mkdir -p $(BUILD_DIR)/buildroot-config
 	@$(COMMON_CONFIG_ENV) $< --oldconfig $(CONFIG_CONFIG_IN)
 
 randconfig: $(BUILD_DIR)/buildroot-config/conf outputmakefile
 	@mkdir -p $(BUILD_DIR)/buildroot-config
-	@$(COMMON_CONFIG_ENV) $< --randconfig $(CONFIG_CONFIG_IN)
+	@$(COMMON_CONFIG_ENV) SKIP_LEGACY=y $< --randconfig $(CONFIG_CONFIG_IN)
+	@$(COMMON_CONFIG_ENV) $< --olddefconfig $(CONFIG_CONFIG_IN) >/dev/null
 
 allyesconfig: $(BUILD_DIR)/buildroot-config/conf outputmakefile
 	@mkdir -p $(BUILD_DIR)/buildroot-config
-	@$(COMMON_CONFIG_ENV) $< --allyesconfig $(CONFIG_CONFIG_IN)
+	@$(COMMON_CONFIG_ENV) SKIP_LEGACY=y $< --allyesconfig $(CONFIG_CONFIG_IN)
+	@$(COMMON_CONFIG_ENV) $< --olddefconfig $(CONFIG_CONFIG_IN) >/dev/null
 
 allnoconfig: $(BUILD_DIR)/buildroot-config/conf outputmakefile
 	@mkdir -p $(BUILD_DIR)/buildroot-config
-	@$(COMMON_CONFIG_ENV) $< --allnoconfig $(CONFIG_CONFIG_IN)
+	@$(COMMON_CONFIG_ENV) SKIP_LEGACY=y $< --allnoconfig $(CONFIG_CONFIG_IN)
+	@$(COMMON_CONFIG_ENV) $< --olddefconfig $(CONFIG_CONFIG_IN) >/dev/null
 
 randpackageconfig: $(BUILD_DIR)/buildroot-config/conf outputmakefile
 	@mkdir -p $(BUILD_DIR)/buildroot-config
 	@grep -v BR2_PACKAGE_ $(BR2_CONFIG) > $(CONFIG_DIR)/.config.nopkg
-	@grep '^config BR2_PACKAGE_' Config.in.legacy | \
-		while read config pkg; do \
-		echo "# $$pkg is not set" >> $(CONFIG_DIR)/.config.nopkg; done
-	@$(COMMON_CONFIG_ENV) \
+	@$(COMMON_CONFIG_ENV) SKIP_LEGACY=y \
 		KCONFIG_ALLCONFIG=$(CONFIG_DIR)/.config.nopkg \
 		$< --randconfig $(CONFIG_CONFIG_IN)
 	@rm -f $(CONFIG_DIR)/.config.nopkg
+	@$(COMMON_CONFIG_ENV) $< --olddefconfig $(CONFIG_CONFIG_IN) >/dev/null
 
 allyespackageconfig: $(BUILD_DIR)/buildroot-config/conf outputmakefile
 	@mkdir -p $(BUILD_DIR)/buildroot-config
 	@grep -v BR2_PACKAGE_ $(BR2_CONFIG) > $(CONFIG_DIR)/.config.nopkg
-	@grep '^config BR2_PACKAGE_' Config.in.legacy | \
-		while read config pkg; do \
-		echo "# $$pkg is not set" >> $(CONFIG_DIR)/.config.nopkg; done
-	@$(COMMON_CONFIG_ENV) \
+	@$(COMMON_CONFIG_ENV) SKIP_LEGACY=y \
 		KCONFIG_ALLCONFIG=$(CONFIG_DIR)/.config.nopkg \
 		$< --allyesconfig $(CONFIG_CONFIG_IN)
 	@rm -f $(CONFIG_DIR)/.config.nopkg
+	@$(COMMON_CONFIG_ENV) $< --olddefconfig $(CONFIG_CONFIG_IN) >/dev/null
 
 allnopackageconfig: $(BUILD_DIR)/buildroot-config/conf outputmakefile
 	@mkdir -p $(BUILD_DIR)/buildroot-config
 	@grep -v BR2_PACKAGE_ $(BR2_CONFIG) > $(CONFIG_DIR)/.config.nopkg
-	@$(COMMON_CONFIG_ENV) \
+	@$(COMMON_CONFIG_ENV) SKIP_LEGACY=y \
 		KCONFIG_ALLCONFIG=$(CONFIG_DIR)/.config.nopkg \
 		$< --allnoconfig $(CONFIG_CONFIG_IN)
 	@rm -f $(CONFIG_DIR)/.config.nopkg
+	@$(COMMON_CONFIG_ENV) $< --olddefconfig $(CONFIG_CONFIG_IN) >/dev/null
 
 silentoldconfig: $(BUILD_DIR)/buildroot-config/conf outputmakefile
 	@mkdir -p $(BUILD_DIR)/buildroot-config