Commit 39867f3c authored by Thomas De Schampheleire's avatar Thomas De Schampheleire Committed by Thomas Petazzoni
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kconfig infra: add support for defconfig files 



This commit adds support for using a defconfig file instead of a full
.config. This is a precondition to migrate packages like linux and
barebox to the kconfig infrastructure.

Signed-off-by: default avatarThomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: default avatar"Yann E. Morin" <yann.morin.1998@free.fr>
Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
parent 23fd6e0e

package/pkg-kconfig.mk

+17 −0
Original line number Diff line number Diff line
@@ -47,8 +47,13 @@ $$($(2)_KCONFIG_FILE): | $(1)-patch 


# The .config file is obtained by copying it from the specified source

# configuration file, after the package has been patched.

# Since the file could be a defconfig file it needs to be expanded to a

# full .config first. We use 'make oldconfig' because this can be safely

# done even when the package does not support defconfigs.

$$($(2)_DIR)/.config: $$($(2)_KCONFIG_FILE)

	$$(INSTALL) -m 0644 $$($(2)_KCONFIG_FILE) $$($(2)_DIR)/.config

	@yes "" | $$($(2)_MAKE_ENV) $$(MAKE) -C $$($(2)_DIR) \

		$$($(2)_KCONFIG_OPTS) oldconfig



# In order to get a usable, consistent configuration, some fixup may be needed.

# The exact rules are specified by the package .mk file.
@@ -68,10 +73,22 @@ $$(addprefix $(1)-,$$($(2)_KCONFIG_EDITORS)): $$($(2)_DIR)/.stamp_kconfig_fixup_ 
	rm -f $$($(2)_DIR)/.stamp_{kconfig_fixup_done,configured,built}

	rm -f $$($(2)_DIR)/.stamp_{target,staging}_installed



$(1)-savedefconfig: $$($(2)_DIR)/.stamp_kconfig_fixup_done

	$$($(2)_MAKE_ENV) $$(MAKE) -C $$($(2)_DIR) \

		$$($(2)_KCONFIG_OPTS) savedefconfig



# Target to copy back the configuration to the source configuration file

$(1)-update-config: $$($(2)_DIR)/.stamp_kconfig_fixup_done

	cp --preserve=timestamps -f $$($(2)_DIR)/.config $$($(2)_KCONFIG_FILE)



# Note: make sure the timestamp of the stored configuration is not newer than

# the .config to avoid a useless rebuild. Note that, contrary to

# $(1)-update-config, the reference for 'touch' is _not_ the file from which

# we copy.

$(1)-update-defconfig: $(1)-savedefconfig

	cp -f $$($(2)_DIR)/defconfig $$($(2)_KCONFIG_FILE)

	touch --reference $$($(2)_DIR)/.config $$($(2)_KCONFIG_FILE)



endef # inner-kconfig-package



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