build: allow obj=/absolute/path

This allows moving the build tree outside the source tree.

Change-Id: I97882c4820d2c962c27bf8d50378e64016ce5790
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/5803
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
abuild: allow deleting the work directories immediately

This is useful on pure build nodes that don't care for
object files, just for a build log and success flag.

Change-Id: Ida65d4e41652af0f1b7255309aec2eeb6ef5c9ef
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/5804
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
abuild: allow build results outside the source tree

A reasonable configuration that minimizes disk traffic
could be

    $ abuild -o /tmp/abuild-$$ -z

Change-Id: Ic91798af7e799a40a77025e09a6078ea6758cdac
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/5805
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
abuild: update version and copyright

Enough changed to warrant a new version, date,
and copyright.

Change-Id: Ia099cd4fec3b05efc3f8bac09d38baede1c719e0
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/5806
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
abuild: make build directory configurable with a variable

Allow overriding the build directly (default: coreboot-builds)
using the COREBOOT_BUILD_DIR variable, in addition to setting
it through the -o parameter.
This helps with build nodes where jenkins wants to run the
same command everywhere but allows different environment
variables.

Change-Id: If907897cf6ac01caa7d1e4b51aad4c005356bc5b
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/4543
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>