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===== Overview =====

Migration issues in various releases.

===== Yocto Project 2.3 (morty -> pyro) =====

* recipe-specific sysroots, so you must be more rigorous about DEPENDS -- those dependencies will be populated into the recipe's sysroot
* PACKAGE_WRITE_DEPS to enumerate host tools necessary for pre- and post-install scripts; see "Post-Installation Scripts" in Dev Tasks Manual (see do_rootfs() task)
<code>
PACKAGE_WRITE_DEPS += "${@bb.utils.contains('DISTRO_FEATURES','systemd sysvinit','systemd-systemctl-native','',d)}"
</code>
* SYSROOT_PREPROCESS_FUNCS
* Check per-recipe settings of SYSTEMD_AUTO_ENABLE
<code>

recipes-bsp/apmd/apmd_3.2.2-15.bb:SYSTEMD_AUTO_ENABLE = "disable"
recipes-connectivity/dhcp/dhcp.inc:SYSTEMD_AUTO_ENABLE_${PN}-server = "disable"
recipes-connectivity/dhcp/dhcp.inc:SYSTEMD_AUTO_ENABLE_${PN}-relay = "disable"
recipes-connectivity/dhcp/dhcp.inc:SYSTEMD_AUTO_ENABLE_${PN}-client = "disable"
recipes-connectivity/wpa-supplicant/wpa-supplicant_2.6.bb:SYSTEMD_AUTO_ENABLE = "disable"
recipes-core/util-linux/util-linux.inc:SYSTEMD_AUTO_ENABLE_${PN}-uuidd = "disable"
recipes-core/util-linux/util-linux.inc:SYSTEMD_AUTO_ENABLE_${PN}-fstrim = "disable"
recipes-devtools/dnf/dnf_2.7.5.bb:SYSTEMD_AUTO_ENABLE ?= "disable"
recipes-extended/mdadm/mdadm_4.0.bb:SYSTEMD_AUTO_ENABLE = "disable"
recipes-extended/watchdog/watchdog_5.15.bb:SYSTEMD_AUTO_ENABLE = "disable"
recipes-extended/sysstat/sysstat.inc:SYSTEMD_AUTO_ENABLE = "enable"
recipes-extended/sysklogd/sysklogd.inc:SYSTEMD_AUTO_ENABLE = "enable"
recipes-kernel/lttng/lttng-tools_2.9.11.bb:SYSTEMD_AUTO_ENABLE = "disable"
</code>
* Per-recipe STAGING_DIR_NATIVE
* lnr (poky/scripts/lnr); relative_symlinks.bbclass
<code>
do_install[postfuncs] += "install_relative_symlinks"

python install_relative_symlinks () {
    oe.path.replace_absolute_symlinks(d.getVar('D'), d)
}
</code>
* Smart package manager replaced by DNF
** Smart no longer maintained
** Smart not ported to Python 3
* RPM 5 downgraded to RPM 4
** DNF incompatible with RPM 5
** RPM 5 just not popular




===== Yocto Project 2.4 (pyro -> rocko) =====

* no need to include linux-dtb.inc anymore

===== Yocto Project 2.5 (rocko -> sumo) =====

===== Yocto Project 2.6 (sumo -> thud) =====