bitbake.conf: use ${TCMODE}-${TCLIBC} directory for CACHE

* move TCMODE and TCLIBC from defaultsetup.conf to bitbake.conf
* set CACHE as it was in defaultsetup.conf and drop it from defaultsetup.conf
* most if not all DISTROs are now including defaultsetup.conf and
  TCLIBC is pretty much expected to be always set correctly, e.g.:
  meta/recipes-core/systemd/systemd_243.2.bb:    if d.getVar('TCLIBC') == "musl":
  meta/recipes-devtools/gcc/gcc-runtime.inc:        if [ "${TCLIBC}" != "glibc" ]; then
  meta/recipes-devtools/gcc/libgcc.inc:     if [ "${TCLIBC}" != "glibc" ]; then
  meta/recipes-devtools/icecc-toolchain/nativesdk-icecc-toolchain_0.1.bb:ENV_NAME="${DISTRO}-${TCLIBC}-${SDK_ARCH}-@TARGET_PREFIX@${DISTRO_VERSION}.tar.gz"
  meta/recipes-devtools/valgrind/valgrind_3.15.0.bb:RRECOMMENDS_${PN} += "${TCLIBC}-dbg"
  meta/recipes-kernel/linux/kernel-devsrc.bb:RDEPENDS_${PN} = "bc python3 flex bison ${TCLIBC}-utils"

  meta/classes/buildhistory.bbclass:BUILDHISTORY_DIR_IMAGE = "${BUILDHISTORY_DIR}/images/${MACHINE_ARCH}/${TCLIBC}/${IMAGE_BASENAME}"
  meta/classes/cross-canadian.bbclass:    if d.getVar("TCLIBC") in [ 'baremetal', 'newlib' ]:
  meta/classes/kernel.bbclass:    tclibc = d.getVar('TCLIBC')
  meta/classes/toaster.bbclass:    BUILDHISTORY_DIR_IMAGE_BASE = e.data.expand("%s/images/${MACHINE_ARCH}/${TCLIBC}/"% BUILDHISTORY_DIR)

(From OE-Core rev: 57aa60ef6422568b425b6ccc4451567efc578469)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/conf/bitbake.conf

@@ -357,8 +357,11 @@ FILESYSTEM_PERMS_TABLES ?= "${@'files/fs-perms.txt' if oe.types.boolean(d.getVar
 # General work and output directories for the build system.
 ##################################################################
 
+TCMODE ?= "default"
+TCLIBC ?= "glibc"
 TMPDIR ?= "${TOPDIR}/tmp"
-CACHE = "${TMPDIR}/cache${@['', '/' + str(d.getVar('MACHINE'))][bool(d.getVar('MACHINE'))]}${@['', '/' + str(d.getVar('SDKMACHINE'))][bool(d.getVar('SDKMACHINE'))]}"
+
+CACHE = "${TMPDIR}/cache/${TCMODE}-${TCLIBC}${@['', '/' + str(d.getVar('MACHINE'))][bool(d.getVar('MACHINE'))]}${@['', '/' + str(d.getVar('SDKMACHINE'))][bool(d.getVar('SDKMACHINE'))]}"
 # The persistent cache should be shared by all builds
 PERSISTENT_DIR = "${TOPDIR}/cache"
 LOG_DIR = "${TMPDIR}/log"

meta/conf/distro/defaultsetup.conf

@@ -3,10 +3,7 @@ include conf/distro/include/default-versions.inc
 include conf/distro/include/default-distrovars.inc
 include conf/distro/include/maintainers.inc
 
-TCMODE ?= "default"
 require conf/distro/include/tcmode-${TCMODE}.inc
-
-TCLIBC ?= "glibc"
 require conf/distro/include/tclibc-${TCLIBC}.inc
 
 require conf/distro/include/uninative-flags.inc
@@ -15,8 +12,6 @@ require conf/distro/include/uninative-flags.inc
 TCLIBCAPPEND ?= "-${TCLIBC}"
 TMPDIR .= "${TCLIBCAPPEND}"
 
-CACHE = "${TMPDIR}/cache/${TCMODE}-${TCLIBC}${@['', '/' + str(d.getVar('MACHINE'))][bool(d.getVar('MACHINE'))]}${@['', '/' + str(d.getVar('SDKMACHINE'))][bool(d.getVar('SDKMACHINE'))]}"
-
 USER_CLASSES ?= ""
 PACKAGE_CLASSES ?= "package_ipk"
 INHERIT_BLACKLIST = "blacklist"