The main sysroot components of unreachable build targets will be removed by the 
core
code. This currently doesn't trigger a removal in the individual workdirs. This
adds in symlinking between the complete stamps and the component sysroot meaning
we can detect when someting was removed and hence remove it from the sysroot.

This fixes cases where DISTRO_FEATURES like systemd are changed amongst other
things and makes builds more robust against configuration changes.

If a dependency is rebuild, that is caught by checksum comparision code 
elsewhere
in this function as before.

Signed-off-by: Richard Purdie <richard.pur...@linuxfoundation.org>
---
 meta/classes/staging.bbclass | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/meta/classes/staging.bbclass b/meta/classes/staging.bbclass
index 1b618fb..cc7767a 100644
--- a/meta/classes/staging.bbclass
+++ b/meta/classes/staging.bbclass
@@ -490,6 +490,18 @@ python extend_recipe_sysroot() {
     fixme['native'] = []
     postinsts = []
     multilibs = {}
+    manifests = {}
+
+    for f in os.listdir(depdir):
+        if not f.endswith(".complete"):
+            continue
+        f = depdir + "/" + f
+        if os.path.islink(f) and not os.path.exists(f):
+            bb.note("%s no longer exists, removing from sysroot" % f)
+            lnk = os.readlink(f.replace(".complete", ""))
+            sstate_clean_manifest(depdir + "/" + lnk, d, workdir)
+            os.unlink(f)
+            os.unlink(f.replace(".complete", ""))
 
     for dep in configuredeps:
         c = setscenedeps[dep][0]
@@ -547,6 +559,7 @@ python extend_recipe_sysroot() {
             bb.warn("Manifest %s not found?" % manifest)
         else:
             with open(manifest, "r") as f, open(taskmanifest, 'w') as m:
+                manifests[dep] = manifest
                 for l in f:
                     l = l.strip()
                     if l.endswith("/"):
@@ -573,9 +586,9 @@ python extend_recipe_sysroot() {
     for p in postinsts:
         subprocess.check_output(p, shell=True)
 
-    for dep in configuredeps:
+    for dep in manifests:
         c = setscenedeps[dep][0]
-        open(depdir + "/" + c + ".complete", "w").close()
+        os.symlink(manifests[dep], depdir + "/" + c + ".complete")
 
     bb.utils.unlockfile(lock)
 }
-- 
2.7.4

-- 
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