[PATCH] rm_work.bbclass: re-enable recursive do_rm_work_all

[Patrick Ohly <patrick.ohly@intel.com>]

When rewriting the do_rm_work injection, do_rm_work_all had been
removed because it seemed obsolete, as do_build now always triggers
do_rm_work.

However, do_build does not get triggered for all recipes and thus
do_rm_work was not called for recipes that got built only
partially. For example, zlib depends indirectly on
zlib-native:do_populate_sysroot.  Because of that dependency,
zlib-native got compiled, but do_rm_work was never called for it.

Re-introducing do_rm_work_all fixes that by making do_build depend on
do_rm_work_all, which then recursively depends on do_rm_work of all
dependencies. This has the unintended side-effect that do_rm_work then
also triggers additional work (like do_populate_lic) that normally
doesn't need to be done for a build. This seems like the lesser evil,
compared to an incomplete cleanup because it mostly enables the
lighter tasks after do_populate_sysroot.

The real solution would be to have two kinds of relationships: a weak
ordering relationship ("if A and B are enabled, A must run before B,
but B can also run without A") and hard dependencies ("B cannot run
unless A has run before").

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
---
 meta/classes/rm_work.bbclass | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/meta/classes/rm_work.bbclass b/meta/classes/rm_work.bbclass
index 054c937..2490a69 100644
--- a/meta/classes/rm_work.bbclass
+++ b/meta/classes/rm_work.bbclass
@@ -102,6 +102,12 @@ do_rm_work () {
         rm -f $i
     done
 }
+do_rm_work_all () {
+    :
+}
+do_rm_work_all[recrdeptask] = "do_rm_work"
+do_rm_work_all[noexec] = "1"
+addtask rm_work_all after before do_build
 
 do_populate_sdk[postfuncs] += "rm_work_populatesdk"
 rm_work_populatesdk () {
@@ -138,9 +144,8 @@ python inject_rm_work() {
         # do_build inherits additional runtime dependencies on
         # other recipes and thus will typically run much later than completion of
         # work in the recipe itself.
-        deps = bb.build.preceedtask('do_build', True, d)
-        if 'do_build' in deps:
-            deps.remove('do_build')
+        deps = set(bb.build.preceedtask('do_build', True, d))
+        deps.difference_update(('do_build', 'do_rm_work_all'))
         # In practice, addtask() here merely updates the dependencies.
         bb.build.addtask('do_rm_work', 'do_build', ' '.join(deps), d)
 }

base-commit: 477805b913a6c4b4b630e42f08cd9e59f1e4e254
-- 
git-series 0.9.1