insane: Check for feature check variables not being used

Add a package QA check for wether any of the variables used by
features_check.bbclass is set while not inheriting the class itself.

(From OE-Core rev: c06489d102682504afe33f9fee3facd9628b3f57)

Signed-off-by: Jacob Kroon <jacob.kroon@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/insane.bbclass

@@ -26,7 +26,7 @@ WARN_QA ?= " libdir xorg-driver-abi \
             textrel incompatible-license files-invalid \
             infodir build-deps src-uri-bad symlink-to-sysroot multilib \
             invalid-packageconfig host-user-contaminated uppercase-pn patch-fuzz \
-            mime mime-xdg unlisted-pkg-lics \
+            mime mime-xdg unlisted-pkg-lics unhandled-features-check \
             "
 ERROR_QA ?= "dev-so debug-deps dev-deps debug-files arch pkgconfig la \
             perms dep-cmp pkgvarcheck perm-config perm-line perm-link \
@@ -980,6 +980,16 @@ def package_qa_check_src_uri(pn, d, messages):
         if re.search(r"github\.com/.+/.+/archive/.+", url):
             package_qa_handle_error("src-uri-bad", "%s: SRC_URI uses unstable GitHub archives" % pn, d)
 
+QARECIPETEST[unhandled-features-check] = "package_qa_check_unhandled_features_check"
+def package_qa_check_unhandled_features_check(pn, d, messages):
+    if not bb.data.inherits_class('features_check', d):
+        var_set = False
+        for kind in ['DISTRO', 'MACHINE', 'COMBINED']:
+            for var in ['ANY_OF_' + kind + '_FEATURES', 'REQUIRED_' + kind + '_FEATURES', 'CONFLICT_' + kind + '_FEATURES']:
+                if d.getVar(var) is not None or d.overridedata.get(var) is not None:
+                    var_set = True
+        if var_set:
+            package_qa_handle_error("unhandled-features-check", "%s: recipe doesn't inherit features_check" % pn, d)
 
 # The PACKAGE FUNC to scan each package
 python do_package_qa () {