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kconfig infra: add support for defconfig files

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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: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: "Yann E. Morin" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Thomas De Schampheleire 2015-02-03 15:21:42 +01:00 committed by Thomas Petazzoni
parent 23fd6e0e6a
commit 39867f3c8c
1 changed files with 17 additions and 0 deletions
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17
package/pkg-kconfig.mk
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@ -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
################################################################################