[PATCH v4 05/10] nativesdk-packagegroup-sdk-host: add an SDK_FEATURES lever

[Trevor Woerner <twoerner@gmail.com>]

Add SDK_FEATURES, a mechanism for optionally adding features to a
standalone SDK, in the same spirit as DISTRO_FEATURES, MACHINE_FEATURES
and IMAGE_FEATURES: a configuration adds a feature to the list and gets
the corresponding additions, and a developer reads the setting and knows
exactly what is being included.

This commit only introduces the variable (defaulting to empty) and
documents it; the features that consume it are wired up separately. An
empty default changes nothing on its own.

AI-Generated: codex/claude-opus 4.8 (xhigh)
Signed-off-by: Trevor Woerner <twoerner@gmail.com>
---
changes in v4:
- split out from the v3 "add wic via a new SDK_FEATURES lever" patch:
  this patch now introduces only the SDK_FEATURES variable and its
  documentation, defaulting to empty, with the individual features added
  in their own patches
---
 meta/conf/bitbake.conf       | 1 +
 meta/conf/documentation.conf | 1 +
 2 files changed, 2 insertions(+)

diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index bdf37d0da247..8f590ed374f0 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -898,6 +898,7 @@ OES_BITBAKE_CONF = "1"
 
 MACHINE_FEATURES:append = " ${@oe.utils.filter_default_features('MACHINE_FEATURES', d)}"
 SDK_MACHINE_FEATURES ?= ""
+SDK_FEATURES ?= ""
 
 DISTRO_FEATURES:append = " ${@oe.utils.filter_default_features('DISTRO_FEATURES', d)}"
 
diff --git a/meta/conf/documentation.conf b/meta/conf/documentation.conf
index 842cf31739de..42c8327e10ff 100644
--- a/meta/conf/documentation.conf
+++ b/meta/conf/documentation.conf
@@ -361,6 +361,7 @@ SANITY_TESTED_DISTROS[doc] = "A list of the host distribution identifiers that t
 SDK_ARCH[doc] = "The target architecture for the SDK."
 SDK_DEPLOY[doc] = "The directory set up and used by the populate_sdk_base to which the SDK is deployed."
 SDK_DIR[doc] = "The parent directory used by the OpenEmbedded build system when creating SDK output."
+SDK_FEATURES[doc] = "The list of optional features to add to the standalone SDK's host tools. Analogous to IMAGE_FEATURES but for the SDK host side."
 SDK_NAME[doc] = "The base name for SDK output files."
 SDK_OUTPUT[doc] = "The location used by the OpenEmbedded build system when creating SDK output."
 SDKIMAGE_FEATURES[doc] = "Equivalent to IMAGE_FEATURES. However, this variable applies to the SDK generated from an image using the command 'bitbake -c populate_sdk imagename'."
-- 
2.50.0.173.g8b6f19ccfc3a