[PATCH v3] layer.conf: fix sanity error for PATH variable in extensible SDK workflow

["Sourabh Banerjee" <sbanerje@codeaurora.org>]

Sanity checker reports following error for the PATH variable,
when bitbake -e <recipe> command is run in an extensible SDK workspace.
   PATH contains '.', './' or '' (empty element), which will break the build

In case of extensible SDK, PATH variable is formed with two consecutive ':'
as bb.utils.which(d.getVar('PATH'),'bitbake') call returns an empty string.

This change adds ':' if BITBAKEPATH is a non empty string.

Signed-off-by: Sourabh Banerjee <sbanerje@codeaurora.org>
---
 meta/conf/layer.conf | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/meta/conf/layer.conf b/meta/conf/layer.conf
index 38df0f3..9ff5fce 100644
--- a/meta/conf/layer.conf
+++ b/meta/conf/layer.conf
@@ -102,4 +102,6 @@ SSTATE_EXCLUDEDEPS_SYSROOT += "\
 SSTATE_EXCLUDEDEPS_SYSROOT += ".*->autoconf-archive-native"
 
 # We need to keep bitbake tools in PATH
-PATH := "${@os.path.dirname(bb.utils.which(d.getVar('PATH'),'bitbake'))}:${HOSTTOOLS_DIR}"
+# Avoid empty path entries
+BITBAKEPATH := "${@os.path.dirname(bb.utils.which(d.getVar('PATH'),'bitbake'))}"
+PATH := "${@'${BITBAKEPATH}:' if '${BITBAKEPATH}' is not '' else ''}${HOSTTOOLS_DIR}"
-- 
$(echo -e 'The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project')



-- 
Regards,
Sourabh