bitbake.conf: add STAMPS_DIR for constructing STAMP

Add STAMPS_DIR for constructing STAMP, the defination of STAMP is:

STAMP = "${TMPDIR}/stamps/${MULTIMACH_TARGET_SYS}/${PN}/${EXTENDPE}${PV}-${PR}"

We can only change the TMPDIR if we want to change the STAMP's location,
but the bb_cache.dat would be regenerated if TMPDIR changes, so add
STAMPS_DIR for constructing it, and add it to the BB_ENV_EXTRAWHITE,
this is very usefull for the "bitbake -S", since then it can be run by:

STAMPS_DIR=<path> bitbake -S <recipe>

which will avoid putting the stamps to ${TMPDIR}/stamps.

BTW, break the too long BB_ENV_EXTRAWHITE into several lines.

[YOCTO #1659]

(From OE-Core rev: ce732c04b3ac06633e20efa8799c4189abfd41b3)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 3afaf4ab2b..beba7d10de 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -336,8 +336,9 @@ GITDIR = "${CO_DIR}/git2"
 BZRDIR = "${CO_DIR}/bzr"
 HGDIR = "${CO_DIR}/hg"
 
-STAMP = "${TMPDIR}/stamps/${MULTIMACH_TARGET_SYS}/${PN}/${EXTENDPE}${PV}-${PR}"
-STAMPCLEAN = "${TMPDIR}/stamps/${MULTIMACH_TARGET_SYS}/${PN}/*-*"
+STAMPS_DIR ?= "${TMPDIR}/stamps"
+STAMP = "${STAMPS_DIR}/${MULTIMACH_TARGET_SYS}/${PN}/${EXTENDPE}${PV}-${PR}"
+STAMPCLEAN = "${STAMPS_DIR}/${MULTIMACH_TARGET_SYS}/${PN}/*-*"
 WORKDIR = "${TMPDIR}/work/${MULTIMACH_TARGET_SYS}/${PN}/${EXTENDPE}${PV}-${PR}"
 T = "${WORKDIR}/temp"
 D = "${WORKDIR}/image"