[yocto] static libraries missing from sdk

[Mircea Gliga]

Hello,

I have a problem providing a static library in the SDK:
I have a recipe that builds a library. It outputs an -dev pkg with the 
/usr/{include,lib} libs in it and a -staticdev pkg with the static library.
The main pkg is empty, in my recipe I have added ALLOW_EMPTY_${PN} = "1" 
because the -dev and -staticdev depend on it

In my local.conf I have added:
     SDKIMAGE_FEATURES += "dev-pkgs dbg-pkgs staticdev-pkgs"

Then I run
     bitbake my-image -c populate_sdk
After installing the SDK, I get the headers (from the -dev pkg) but not 
the static library from the -staticdev pkg.

Why is that ? From my understanding specifying staticdev-pkgs in the 
SDKIMAGE_FEATURE should have this covered.

I was able to "force" the install of the -staticdev pks by adding to 
local.conf:

     TOOLCHAIN_TARGET_TASK_append = " mylibrary-staticdev"

Do you have to manually take care of this ? Then, what's the purpose of 
SDKIMAGE_FEATURES += " staticdev-pkgs" ?
I would like to  have all static libraries in the SDK.

Thanks and regards