distro_features_check.bbclass: Allow checking of required/conflicting features
This add support to list required/confliting distro features for a
recipe; this avoids user mistake when building recipes/images which
would not work depending on DISTRO_FEATURES option set.
Adding:
,----[ Use example ]
| inherit distro_features_check
|
| REQUIRED_DISTRO_FEATURES = "x11"
| CONFLICT_DISTRO_FEATURES_mx6 = "wayland"
`----
In the image recipe allow us to make clear to user that this image
needs X11 and /cannot/ be build with Wayland support in i.MX6
platforms, for example.
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br> Signed-off-by: Saul Wold <sgw@linux.intel.com>
