4.8 Moving to the Yocto Project 2.0 Release
This section provides migration information for moving to the Yocto Project 2.0 Release from the prior release.
4.8.1 GCC 5
The default compiler is now GCC 5.2. This change has required fixes for compilation errors in a number of other recipes.
One important example is a fix for when the Linux kernel freezes at boot
time on ARM when built with GCC 5. If you are using your own kernel
recipe or source tree and building for ARM, you will likely need to
linux-yocto kernel source tree already has a workaround
for the same issue.
For further details, see https://gcc.gnu.org/gcc-5/changes.html and the porting guide at https://gcc.gnu.org/gcc-5/porting_to.html.
Alternatively, you can switch back to GCC 4.9 or 4.8 by setting
GCCVERSION in your configuration, as follows:
GCCVERSION = "4.9%"
4.8.2 Gstreamer 0.10 Removed
Gstreamer 0.10 has been removed in favor of Gstreamer 1.x. As part of
the change, recipes for Gstreamer 0.10 and related software are now
meta-multimedia. This change results in Qt4 having Phonon
and Gstreamer support in QtWebkit disabled by default.
4.8.3 Removed Recipes
The following recipes have been moved or removed:
bluez4: The recipe is obsolete and has been moved due to
bluez5becoming fully integrated. The
bluez4recipe now resides in
gamin: The recipe is obsolete and has been removed.
gnome-icon-theme: The recipe’s functionally has been replaced by
Gstreamer 0.10 Recipes: Recipes for Gstreamer 0.10 have been removed in favor of the recipes for Gstreamer 1.x.
insserv: The recipe is obsolete and has been removed.
libunique: The recipe is no longer used and has been moved to
midori: The recipe’s functionally has been replaced by
python-gst: The recipe is obsolete and has been removed since it only contains bindings for Gstreamer 0.10.
qt-mobility: The recipe is obsolete and has been removed since it requires
Gstreamer 0.10, which has been replaced.
subversion: All 1.6.x versions of this recipe have been removed.
webkit-gtk: The older 1.8.3 version of this recipe has been removed in favor of
4.8.4 BitBake datastore improvements
The method by which BitBake’s datastore handles overrides has changed.
Overrides are now applied dynamically and
now a no-op. Thus,
bb.data.update_data() is no longer required in
order to apply the correct overrides. In practice, this change is
unlikely to require any changes to Metadata. However, these minor
changes in behavior exist:
All potential overrides are now visible in the variable history as seen when you run the following:
$ bitbake -e
d.setVar('VARNAME', None)result in the variable and all of its overrides being cleared out. Before the change, only the non-overridden values were cleared.
4.8.5 Shell Message Function Changes
The shell versions of the BitBake message functions (i.e.
now connected through to their BitBake equivalents
bb.fatal(), respectively. Thus, those message functions that you
would expect to be printed by the BitBake UI are now actually printed.
In practice, this change means two things:
If you now see messages on the console that you did not previously see as a result of this change, you might need to clean up the calls to
bberror, and so forth. Or, you might want to simply remove the calls.
bbfatalmessage function now suppresses the full error log in the UI, which means any calls to
bbfatalwhere you still wish to see the full error log should be replaced by
4.8.6 Extra Development/Debug Package Cleanup
The following recipes have had extra
dev/dbg packages removed:
All of the above recipes now conform to the standard packaging scheme
where a single
-staticdev package exists per
4.8.7 Recipe Maintenance Tracking Data Moved to OE-Core
Maintenance tracking data for recipes that was previously part of
meta-yocto has been moved to OpenEmbedded-Core (OE-Core). The change
distro_alias.inc, which are
typically enabled when using the
distrodata class. Additionally, the
upstream_tracking.inc has now been split out to the
4.8.8 Automatic Stale Sysroot File Cleanup
Stale files from recipes that no longer exist in the current
configuration are now automatically removed from sysroot as well as
removed from any other place managed by shared state. This automatic
cleanup means that the build system now properly handles situations such
as renaming the build system side of recipes, removal of layers from
bblayers.conf, and DISTRO_FEATURES
Additionally, work directories for old versions of recipes are now pruned. If you wish to disable pruning old work directories, you can set the following variable in your configuration:
SSTATE_PRUNE_OBSOLETEWORKDIR = "0"
linux-yocto Kernel Metadata Repository Now Split from Source
linux-yocto tree has up to now been a combined set of kernel
changes and configuration (meta) data carried in a single tree. While
this format is effective at keeping kernel configuration and source
modifications synchronized, it is not always obvious to developers how
to manipulate the Metadata as compared to the source.
Metadata processing has now been removed from the
kernel-yocto class and the external
yocto-kernel-cache, which has always been used
to seed the
linux-yocto “meta” branch. This separate
cache repository is now the primary location for this data. Due to this
linux-yocto is no longer able to process combined trees.
Thus, if you need to have your own combined kernel repository, you must
do the split there as well and update your recipes accordingly. See the
meta/recipes-kernel/linux/linux-yocto_4.1.bb recipe for an example.
4.8.10 Additional QA checks
The following QA checks have been added:
Added a “host-user-contaminated” check for ownership issues for packaged files outside of
/home. The check looks for files that are incorrectly owned by the user that ran BitBake instead of owned by a valid user in the target system.
Added an “invalid-chars” check for invalid (non-UTF8) characters in recipe metadata variable values (i.e. DESCRIPTION, SUMMARY, LICENSE, and SECTION). Some package managers do not support these characters.
Added an “invalid-packageconfig” check for any options specified in PACKAGECONFIG that do not match any
PACKAGECONFIGoption defined for the recipe.
4.8.11 Miscellaneous Changes
These additional changes exist:
gtk-update-icon-cachehas been renamed to
tools-profileIMAGE_FEATURES item as well as its corresponding packagegroup and
packagegroup-core-tools-profileno longer bring in
oprofile. Bringing in
oprofilewas originally added to aid compilation on resource-constrained targets. However, this aid has not been widely used and is not likely to be used going forward due to the more powerful target platforms and the existence of better cross-compilation tools.
The IMAGE_FSTYPES variable’s default value now specifies
All support for the
PRINCvariable has been removed.
packagegroup-core-full-cmdlinepackagegroup no longer brings in
lighttpddue to the fact that bringing in
lighttpdis not really in line with the packagegroup’s purpose, which is to add full versions of command-line tools that by default are provided by