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kconfig-package: add support for config fragments

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Adds functionality to the kconfig infrastructure to merge additional
configuration fragment files to the main configuration file of
kconfig packages, using support/kconfig/merge_config.sh

Typical use-case is when you want your configuration to be
kept in sync with an upstream (def)config file, but do require
some minor local modifications.

Disables -update-config and -update-defconfig targets when
fragment files are set.

[Thomas: take into account comments made by Arnout:
  - Minor fixes in the documentation changes
  - Add @ before the tests done in the $(1)-update-config and
    $(1)-update-defconfig targets.]

Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
Tested-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Tested-by: Gergely Imreh <imrehg@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Floris Bos
2015-04-28 16:34:31 +02:00
committed by Thomas Petazzoni
parent d28882745d
commit 0cfb5549b3
2 changed files with 23 additions and 6 deletions
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15
docs/manual/adding-packages-kconfig.txt
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@@ -34,8 +34,14 @@ This snippet creates the following make targets:
* +foo-menuconfig+, which calls the package's +menuconfig+ target
* +foo-update-config+, which copies the configuration back to the source
configuration file.
* +foo-update-config+, which copies the configuration back to the
source configuration file. It is not possible to use this target
when fragment files are set.
* +foo-update-defconfig+, which copies the configuration back to the
source configuration file. The configuration file will only list the
options that differ from the default values. It is not possible to
use this target when fragment files are set.
and ensures that the source configuration file is copied to the build
directory at the right moment.
@@ -46,6 +52,11 @@ be set to suit the needs of the package under consideration:
* +FOO_KCONFIG_EDITORS+: a space-separated list of kconfig editors to
support, for example 'menuconfig xconfig'. By default, 'menuconfig'.
* +FOO_KCONFIG_FRAGMENT_FILES+: a space-separated list of configuration
fragment files that are merged to the main configuration file.
Fragment files are typically used when there is a desire to stay in sync
with an upstream (def)config file, with some minor modifications.
* +FOO_KCONFIG_OPTS+: extra options to pass when calling the kconfig
editors. This may need to include '$(FOO_MAKE_OPTS)', for example. By
default, empty.