base.bbclass: warn when there is trailing slash in S or B variables

* to make sure we won't hit such corner cases in future add a warning
  to prevent trailing slashes and duplicated slashes even when they
  in most cases don't cause harm

* only a few cases were found in layers included in my world builds:
  oe-core: 1
  meta-oe: 7
  meta-python2: 1
  meta-qt5: 1
  meta-aws: 1

  will send patches for these once this warning is approved for oe-core

(From OE-Core rev: 8a4c473c07cba159cf88ed775b9f073c6adf31d4)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/meta/classes/base.bbclass b/meta/classes/base.bbclass
index 62e34d0079..5a0b0c6b3e 100644
--- a/meta/classes/base.bbclass
+++ b/meta/classes/base.bbclass
@@ -388,6 +388,11 @@ python () {
     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")):