External source tree is used as the builddir even for different
architectures in case ${B}=${S}. This may cause problems if MACHINE is
changed as do_configure is not being re-run (which would run make
clean). This patches changes externalsrc to use a common (per-recipe)
CONFIGURESTAMPFILE under 'work-shared' if ${B}=${S}. In addition,
do_configure will depend on changes of this stamp file. As a result,
do_configure is re-run and the build dir is cleaned correctly if a
rebuild for different MACHINE is done.
[YOCTO #8950]
Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
