[PATCH 2/2 [RFC]] image.bbclass: Unconditional includes of populate_sdk_ext fails

[Mark Hatle <mark.hatle@windriver.com>]

populate_sdk_ext requires uninative support, which is only available on
glibc based SDKMACHINES.  For instance, when using mingw32 a dependency
error will occur:

NOTE: Runtime target 'nativesdk-glibc' is unbuildable, removing...
ERROR: Required build target 'core-image-minimal' has no buildable providers.
Missing or unbuildable dependency chain was: ['core-image-minimal', 'uninative-tarball', 'nativesdk-glibc']

This is dues to populate_sdk_ext.bbclass having:
do_populate_sdk_ext[depends] += "buildtools-tarball:do_populate_sdk uninative-tarball:do_populate_sdk"
addtask populate_sdk_ext

Since bitbake can't determine for dependency resolution if the task is going
to be run yet, it blows up and says it simply can't be resolved.

Workaround this problem by making the inherit conditional on the SDK_OS
containing 'linux'.

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
---
 meta/classes/image.bbclass | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index e3769b4..d37995a 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -1,6 +1,9 @@
 inherit rootfs_${IMAGE_PKGTYPE}
 
-inherit populate_sdk_ext
+# Only Linux SDKs support populate_sdk_ext, fall back to populate_sdk
+# in the non-Linux SDK_OS case, such as mingw32
+SDKEXTCLASS ?= "${@['populate_sdk', 'populate_sdk_ext']['linux' in d.getVar("SDK_OS", True)]}"
+inherit ${SDKEXTCLASS}
 
 TOOLCHAIN_TARGET_TASK += "${PACKAGE_INSTALL}"
 TOOLCHAIN_TARGET_TASK_ATTEMPTONLY += "${PACKAGE_INSTALL_ATTEMPTONLY}"
-- 
1.9.3