The archiver.bbclass will put the sources to ARCHIVER_OUTDIR according
to configuration, then the rpmbuild -bs will create the srpm.
[YOCTO #4986]
[YOCTO #5113]
(From OE-Core rev: f9ba047afb8780c8bd7cb1ba45470d30abf92e92)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>