bitbake.conf: Make TCLIBC and TCMODE lazy assigned

This allows two level of overriding (distro level and local.conf/shell
variable). Previous settings blocked shell variables overring
if it was overriden on distro level.

Signed-off-by: Pavel Zhukov <pavel.zhukov@huawei.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 0e939aca4f98961eb1cb1fc09229038943c4422c..2a3cf6f8aa44e635f69f941ddd033381af09e6b7 100644 (file)
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -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'))]}"