task.bbclass: add a task class that sets common task recipe

variables and automates adding -dev and -dbg packages

diff --git a/classes/task.bbclass b/classes/task.bbclass
new file mode 100644 (file)
index 0000000..4edd704
--- /dev/null
+++ b/classes/task.bbclass
@@ -0,0 +1,27 @@
+# Task packages are only used to pull in other packages
+# via their dependencies. They are empty.
+ALLOW_EMPTY = "1"
+
+# By default, only the task package itself is in PACKAGES.
+# -dbg and -dev flavours are handled by the anonfunc below.
+# This means that task recipes used to build multiple task
+# packages have to modify PACKAGES after inheriting task.bbclass.
+PACKAGES = "${PN}"
+
+# By default, task packages do not depend on a certain architecture.
+# Only if dependencies are modified by MACHINE_FEATURES, packages
+# need to be set to MACHINE_ARCH after inheriting task.bbclass
+PACKAGE_ARCH = "all"
+
+# This automatically adds -dbg and -dev flavours of all PACKAGES
+# to the list. Their dependencies (RRECOMMENDS) are handled as usual
+# by package_depchains in a following step.
+python () {
+    packages = bb.data.getVar('PACKAGES', d, 1).split()
+    genpackages = []
+    for pkg in packages:
+        for postfix in ['-dbg', '-dev']:
+            genpackages.append(pkg+postfix)
+    bb.data.setVar('PACKAGES', ' '.join(packages+genpackages), d)
+}
+