[OE-core] DISTRO_FEATURES_BACKFILL_CONSIDERED_append usage

[Koen Kooi]

Hi,

I've had the following in my DISTRO.conf for a while now:

	DISTRO_FEATURES_BACKFILL_CONSIDERED_append = " sysvinit"

And that seems to do the right thing:

	[koen at rrMBP v2013.06]$ MACHINE=minnow bitbake systemd -e | grep DISTRO_FEATURES | grep BACK
	# $DISTRO_FEATURES_BACKFILL
	DISTRO_FEATURES_BACKFILL="pulseaudio sysvinit"
	# $DISTRO_FEATURES_BACKFILL_CONSIDERED [2 operations]
	DISTRO_FEATURES_BACKFILL_CONSIDERED="sysvinit"

Except that it doesn't:

[koen at rrMBP v2013.06]$ MACHINE=minnow bitbake systemd -e | grep DISTRO_FEATURES | grep sysvinit
#   "alsa argp bluetooth ext2 ipv4 ipv6 irda largefile nfs pam pci pcmcia ppp smbfs systemd usbgadget usbhost vfat wifi xattr zeroconf tk x11 wayland 3g 	pulseaudio ${DISTRO_GLFEATURES} ${DISTRO_FEATURES_LIBC} ${LDISGOLD} sysvinit"
DISTRO_FEATURES="alsa argp bluetooth ext2 ipv4 ipv6 irda largefile nfs pam pci pcmcia ppp smbfs systemd usbgadget usbhost vfat wifi xattr zeroconf tk x11 wayland 3g pulseaudio opengl ipv4 ipv6 libc-backtrace libc-big-macros libc-bsd libc-cxx-tests libc-catgets libc-charsets libc-crypt                                         libc-crypt-ufc libc-db-aliases libc-envz libc-fcvt libc-fmtmsg libc-fstab libc-ftraverse                                        libc-getlogin libc-idn libc-inet-anl libc-libm libc-libm-big libc-locales libc-locale-code                                    libc-memusage libc-nis libc-nsswitch libc-rcmd libc-rtld-debug libc-spawn libc-streams libc-sunrpc                                   libc-utmp libc-utmpx libc-wordexp libc-posix-clang-wchar libc-posix-regexp libc-posix-regexp-glibc                                       libc-posix-wchar-io  sysvinit"

Remembering the IMAGE_FSTYPES_append vs. += discussion, I tried:

	DISTRO_FEATURES_BACKFILL_CONSIDERED += "sysvinit"

The result:

	[koen at rrMBP v2013.06]$ MACHINE=minnow bitbake systemd -e | grep DISTRO_FEATURES | grep sysvinit
	ERROR: Please ensure that your setting of VIRTUAL-RUNTIME_init_manager (sysvinit) matches the entries enabled in DISTRO_FEATURES

Hmmm, let's set VIRTUAL-RUNTIME_init_manager and retry:

	[koen at rrMBP v2013.06]$ MACHINE=minnow bitbake systemd -e | grep DISTRO_FEATURES | grep sysvinit
	DISTRO_FEATURES_BACKFILL="pulseaudio sysvinit" 
	DISTRO_FEATURES_BACKFILL_CONSIDERED="sysvinit"

\o/

So, is this a bug or intended behaviour for DISTRO_FEATURES_BACKFILL_CONSIDERED_append?

regards,

Koen