[PATCH] sdk: Fix build with custom DISTRO when host==target

[Jan Kiszka <jan.kiszka@siemens.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

HOST_DISTRO is not always the right choice for building an SDK. If the
host arch is identical to the target and DISTRO was customized, there is
no HOST_DISTRO to get the bootstrap from. Account for that.

This issue could have been reproduced e.g by xenomai-images when
selecting an x86 target and requesting to build the SDK for it.

Reported-by: Fabian Scheler <fabian.scheler@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 meta/classes/sdk.bbclass | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/meta/classes/sdk.bbclass b/meta/classes/sdk.bbclass
index 74c0acb9..71db6f3a 100644
--- a/meta/classes/sdk.bbclass
+++ b/meta/classes/sdk.bbclass
@@ -44,9 +44,17 @@ SDK_PREINSTALL += " \
     devscripts \
     equivs"
 
+def get_rootfs_distro(d):
+    host_arch = d.getVar('HOST_ARCH')
+    distro_arch = d.getVar('DISTRO_ARCH')
+    if host_arch == distro_arch:
+        return d.getVar('DISTRO')
+    else:
+        return d.getVar('HOST_DISTRO')
+
 # rootfs/image overrides for the SDK
 ROOTFS_ARCH:class-sdk = "${HOST_ARCH}"
-ROOTFS_DISTRO:class-sdk = "${HOST_DISTRO}"
+ROOTFS_DISTRO:class-sdk = "${@get_rootfs_distro(d)}"
 ROOTFS_PACKAGES:class-sdk = "sdk-files ${SDK_TOOLCHAIN} ${SDK_PREINSTALL} ${@isar_multiarch_packages('SDK_INSTALL', d)}"
 ROOTFS_FEATURES:append:class-sdk = " clean-package-cache generate-manifest export-dpkg-status"
 ROOTFS_MANIFEST_DEPLOY_DIR:class-sdk = "${DEPLOY_DIR_SDKCHROOT}"
-- 
2.35.3