The previous fix for a bug in Ubuntu 10.04 readlink,
be2a2764d8ceb398d81714661e6f199c8b11946c, notified the user when a trailing
slash was used. As there is no semantic difference, simply remove any
trailing slashes and proceed without nagging the user.

See [YOCTO #671] for more details.

Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>
Acked-by: Darren Hart <dvhart@linux.intel.com>
Cc: Paul Eggleton <paul.eggleton@linux.intel.com>

[YOCTO #671]

"readlink -f" in Ubuntu 10.04 is buggy: it doesn't ignore a trailing / (e.g.,
"readlink -f /tmp/non-existent-dir/" returns nothing, but according to
http://www.gnu.org/s/coreutils/manual/coreutils.pdf it should do that --
hence we get bug 671. It seems Ubuntu 10.10 or even later Ubuntu 11.04,
and other Linux distributions(e.g., Open Suse 11.4) haven't such an issue.

So I think we should detect this and ask Ubuntu 10.04 users to avoid supply
a path with trailing slash here.

Moreever, I also add the detection of non-existent path, e.g.,
source oe-init-build-env /non-existent-dir/build
can be detected and we'll print an error msg.
And, if we get errors in oe-buildenv-internal, we should stop the script
and shouldn't further run.

Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

These are new variable names in oe-core

Signed-off-by: Khem Raj <raj.khem@gmail.com>

As BB_NUMBER_THREADS is already whitelisted, it is consistent to
also allow PARALLEL_MAKE to be overridden via the environment. This
also simplifies performance testing where multiple combinations of
those two variables are a natural thing to do.

Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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

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

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

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