WARNING: nativesdk-libiconv-1.14-r1 do_patch: WARNING: nativesdk-bzip2-1.0.6-r5 do_package: bzip2: alternative target (/opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bunzip2 or /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bunzip2.bzip2) does not exist, skipping... WARNING: nativesdk-bzip2-1.0.6-r5 do_package: bzip2: alternative target (/opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bzcat or /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bzcat.bzip2) does not exist, skipping... WARNING: nativesdk-bzip2-1.0.6-r5 do_package: bzip2: NOT adding alternative provide /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bunzip2: /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bunzip2.bzip2 does not exist WARNING: nativesdk-bzip2-1.0.6-r5 do_package: bzip2: NOT adding alternative provide /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bzcat: /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bzcat.bzip2 does not exist WARNING: nativesdk-bzip2-1.0.6-r5 do_package: bzip2: alt_link == alt_target: /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bunzip2 == /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bunzip2 WARNING: nativesdk-bzip2-1.0.6-r5 do_package: bzip2: alt_link == alt_target: /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bzcat == /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/bzcat WARNING: nativesdk-diffutils-3.6-r0 do_package: diffutils: alternative target (/opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/diff or /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/diff.diffutils) does not exist, skipping... WARNING: nativesdk-diffutils-3.6-r0 do_package: diffutils: alternative target (/opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/cmp or /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/cmp.diffutils) does not exist, skipping... WARNING: nativesdk-diffutils-3.6-r0 do_package: diffutils: NOT adding alternative provide /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/diff: /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/diff.diffutils does not exist WARNING: nativesdk-diffutils-3.6-r0 do_package: diffutils: NOT adding alternative provide /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/cmp: /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/cmp.diffutils does not exist WARNING: nativesdk-diffutils-3.6-r0 do_package: diffutils: alt_link == alt_target: /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/diff == /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/diff WARNING: nativesdk-diffutils-3.6-r0 do_package: diffutils: alt_link == alt_target: /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/cmp == /opt/poky/2.5+snapshot/sysroots/i686-pokysdk-mingw32/usr/bin/cmp WARNING: core-image-minimal-1.0-r0 do_populate_sdk: The postinstall intercept hook 'update_gio_module_cache-nativesdk' failed, details in /home/pokybuild/yocto-worker/nightly-qa-extras/build/build/tmp/work/qemux86-poky-linux/core-image-minimal/1.0-r0/temp/log.do_populate_sdk
There are actually 2 different warnings. The first is the alternatives warning. There were several of these showing up in multiple recipes, and have been since fixed. The second warning is related to the postinstall intercept hook for update_gio_module_cache-nativesdk. This one is more involved to fix since it is trying to run the hook in qemu, but also far less annoying, since it only appears once per build.
These appear to have been fixed since they are no longer appearing in the autobuilder warning output.