bblayers.conf.sample: Fix empty BBPATH entry warnings

Many people are seeing issues from the empty path warnings from BBPATH.
The empty path entry corresponding to the current working directory is a
problem since if cwd changes, so does BBPATH and build reproducibility.

Simply removing the empty element causes problems since the build
directory then isn't listed in BBPATH which means local.conf isn't found
and this gives an extremely confusing error message about bbappends
being unsatisfied.

The build directory in bitbake terms is TOPDIR. The correct way to fix
things is to add in TOPDIR into bblayers.conf itself. This means the
layers can happily append/prepend to BBPATH at will as its no longer
empty hence neatly solving all the various problems. Since the file has
changed, the version is also changed.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta-yocto/conf/bblayers.conf.sample b/meta-yocto/conf/bblayers.conf.sample
index 78977503206db2e98fa775b27b2a00e6eb359c0a..edbccf02ce67ba5ad437625b9e108393fda4ac54 100644 (file)
--- a/meta-yocto/conf/bblayers.conf.sample
+++ b/meta-yocto/conf/bblayers.conf.sample
@@ -1,8 +1,10 @@
 # LAYER_CONF_VERSION is increased each time build/conf/bblayers.conf
 # changes incompatibly
-LCONF_VERSION = "4"
+LCONF_VERSION = "5"
 
+BBPATH = "${TOPDIR}"
 BBFILES ?= ""
+
 BBLAYERS ?= " \
   ##COREBASE##/meta \
   ##COREBASE##/meta-yocto \