base.bbclass, bitbake.conf: add support for BP/BPN variables (backported from trunk)

commit 94c895aad5
Author: Richard Purdie <rpurdie@linux.intel.com>
Date:   Fri Jan 2 10:15:45 2009 +0000

bitbake.conf: Create BPN variable containing the pruned version of
PN with various suffixes removed and use this for S and FILESPATH.
This uses naming from OE but with improved code

meta/conf/bitbake.conf

@@ -144,6 +144,13 @@ EXTENDPEVER = "${@['','${PE\x7d:'][bb.data.getVar('PE',d,1) > 0]}"
 DEBPV = "${EXTENDPEVER}${PV}-${PR}"
 P = "${PN}-${PV}"
 
+# Base package name
+# Automatically derives "foo" from "foo-native", "foo-cross" or "foo-initial"
+# otherwise it is the same as PN and P
+SPECIAL_PKGSUFFIX = "-native -cross-sdk -cross -sdk -initial -intermediate"
+BPN = "${@base_prune_suffix(bb.data.getVar('PN', d, True), bb.data.getVar('SPECIAL_PKGSUFFIX', d, True).split(), d)}"
+BP = "${BPN}-${PV}"
+
 # Package info.
 
 SECTION = "base"
@@ -232,7 +239,7 @@ STAMP = "${TMPDIR}/stamps/${MULTIMACH_TARGET_SYS}/${PF}"
 WORKDIR = "${TMPDIR}/work/${MULTIMACH_TARGET_SYS}/${PF}"
 T = "${WORKDIR}/temp"
 D = "${WORKDIR}/image"
-S = "${WORKDIR}/${P}"
+S = "${WORKDIR}/${BP}"
 B = "${S}"
 
 STAGING_DIR = "${TMPDIR}/staging"