With --enable-rm-oldimgs=yes one file is left behind. In bitbake_build/tmp/deploy/images/fsl-ls10xx/ the file: wrlinux-image-glibc-small-fsl-ls10xx-*.rootfs.ext2.gz is accumulating as builds occur.
wrl7/wrlinux-7/wrlinux/configure --enable-reconfig --enable-board=fsl-ls10xx --enable-kernel=standard --enable-rootfs=glibc-small --enable-build=production --enable-ccache=yes --enable-jobs=4 --enable-parallel-pkgbuilds=4 --enable-bootimage=ext2.gz.u-boot --enable-rm-oldimgs=yes --with-rcpl-version=0003 make rm bitbake_build/tmp/stamps/fsl_ls10xx-wrs-linux-gnueabi/wrlinux-image-glibc-small/1.0-r1.do_rootfs.* make