New Yocto Recipe Builds but Work Directory is Deleted after Compilation

问题

I am trying to update the recipe for zbar from 0.10.0 to 0.20.1. Here is the original recipe:

https://github.com/openembedded/meta-openembedded/blob/master/meta-oe/recipes-support/zbar/zbar_0.10.bb

My modified recipe is at the bottom of this question. The package does compile, but the problem is that something happens during the "packaging" step and the "work" directory is wiped out except for the "temp" directory inside the "work" directory. During compilation, if I list the files in the work directory, everything I expect is present, but after compilation succeeds, something cleans the files up. What am I doing wrong?

During compilation:

user@ubuntu:~/rpi/build/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/zbar/0.20.1-r0$ cd ../0.20.1-r0/ ; ls
build              image            pkgdata                sysroot-destdir
configure.sstate   license-destdir  pseudo                 temp
debugsources.list  package          recipe-sysroot
git                packages-split   recipe-sysroot-native

After Compilation:

user@ubuntu:~/rpi/build/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/zbar/0.20.1-r0$ cd ../0.20.1-r0/ ; ls
temp

Yocto Recipe:

DESRIPTION = "2D barcode scanner toolkit."
SECTION = "graphics"
LICENSE = "LGPL-2.1"

DEPENDS = "pkgconfig intltool-native libpng jpeg"

LIC_FILES_CHKSUM = "file://LICENSE;md5=243b725d71bb5df4a1e5920b344b86ad"

S = "${WORKDIR}/git"

SRCREV = "edcf08b49e0a5fe71c18fa9d4b8ed83ed8fc9082"
SRC_URI = "git://github.com/mchehab/zbar.git"

inherit autotools pkgconfig

EXTRA_OECONF = " --without-x --without-imagemagick --without-qt --without-python2 --disable-video --without-gtk"

FILES_${PN} += "${bindir}"
FILES_${PN} += "${libdir}"

do_install_append() {
    echo "done..."
}