@@ -386,8 +386,8 @@ FILESYSTEM_PERMS_TABLES ?= "${@'files/fs-perms.txt' if oe.types.boolean(d.getVar
# General work and output directories for the build system.
##################################################################
-TCMODE ?= "default"
-TCLIBC ?= "glibc"
+TCMODE ??= "default"
+TCLIBC ??= "glibc"
TMPDIR ?= "${TOPDIR}/tmp"
CACHE = "${TMPDIR}/cache/${TCMODE}-${TCLIBC}${@['', '/' + str(d.getVar('MACHINE'))][bool(d.getVar('MACHINE'))]}${@['', '/' + str(d.getVar('SDKMACHINE'))][bool(d.getVar('SDKMACHINE'))]}"