diff --git a/poky/meta/classes/base.bbclass b/poky/meta/classes/base.bbclass
index 4c681cc..5a0b0c6 100644
--- a/poky/meta/classes/base.bbclass
+++ b/poky/meta/classes/base.bbclass
@@ -388,6 +388,16 @@
     oe.utils.features_backfill("DISTRO_FEATURES", d)
     oe.utils.features_backfill("MACHINE_FEATURES", d)
 
+    if d.getVar("S")[-1] == '/':
+        bb.warn("Recipe %s sets S variable with trailing slash '%s', remove it" % (d.getVar("PN"), d.getVar("S")))
+    if d.getVar("B")[-1] == '/':
+        bb.warn("Recipe %s sets B variable with trailing slash '%s', remove it" % (d.getVar("PN"), d.getVar("B")))
+
+    if os.path.normpath(d.getVar("WORKDIR")) != os.path.normpath(d.getVar("S")):
+        d.appendVar("PSEUDO_IGNORE_PATHS", ",${S}")
+    if os.path.normpath(d.getVar("WORKDIR")) != os.path.normpath(d.getVar("B")):
+        d.appendVar("PSEUDO_IGNORE_PATHS", ",${B}")
+
     # Handle PACKAGECONFIG
     #
     # These take the form: