[yocto] dev-pkgs not installed in Extensible SDK

[Adrian Dudau]

Adding dev-pkgs to SDKIMAGE_FEATURES I expected that the -dev packages would be installed in the sysroot in the eSDK, but it seems that is valid only for the standard SDK.

I have my own image that inherits core-image with various additions. In the standard SDK, the debug folder under rpi_standard/sysroots/aarch64-enea-linux/usr/src/debug shows like this:
acl          expat        less           libtirpc            make             rpcbind
atk          file         libaio         libtool             mingetty         rpm
attr         findutils    libarchive     libunistring        mpfr             rsync
babeltrace   fontconfig   libassuan      liburcu             ncurses          shadow
base-passwd  freetype     libcap         libx11              nettle           shared-mime-info
bash         fuse         libcheck       libxau              nfs-utils        slang
bc           gcc-runtime  libcomps       libxcb              nspr             sqlite3
blktrace     gdbm         libdnf         libxcomposite       nss              strace
busybox      gdk-pixbuf   libevent       libxcursor          openssh          systemd
bzip2        gettext      libffi         libxdamage          openssl          systemtap
cairo        glib-2.0     libgcc         libxdmcp            pango            tcf-agent
ccache       glibc        libgpg-error   libxext             patch            tcl
coreutils    gmp          libidn         libxfixes           pciutils         tcp-wrappers
curl         gnutls       libjpeg-turbo  libxft              perl             trace-cmd
db           gpgme        libmpc         libxml2             pixman           util-linux
dbus         gtk+         libnfsidmap    libxml-parser-perl  pkgconfig        xz
dhcp         harfbuzz     libnl          libxrandr           popt             zlib
diffstat     json-c       libpcre        libxrender          powertop
diffutils    kbd          libpng         lttng-tools         python3
e2fsprogs    kmod         librepo        lttng-ust           python3-pygpgme
elfutils     latencytop   libsolv        m4                  readline


In the extensible SDK, I only have this under rpi/sysroots/aarch64-enea-linux/usr/src/debug:
bash  bc  glibc  ncurses


I tried building both SDKs based on a vanilla core-image-minimal, and the standard SDK has the sources installed as expected, but the ext SDK has no debug folder containing sources. I tried 

I tried looking into the populate_sdk* classes, but the code there is very hard to understand at a first view. So I guess question is: Is this intended by design or is it a bug? If intended, what is the development worklfow for a user wanting to remote debug applications using shared libraries? 

Best regards,
--Adrian