[OE-core] [PATCH 2/2] bitbake.conf: A change to CCACHE_DIR should not change the sstate sum

[Jason Wessel]

If the location of the CCACHE_DIR changes it should not impact the
sstate sum.  This allows a build generated with an external CCACHE_DIR
to have the same sstate sum as a build that uses the ccache dir
located in the temp build area.

Signed-off-by: Jason Wessel <jason.wessel at windriver.com>
---
 meta/conf/bitbake.conf |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 9f4e4d4..9085779 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -413,6 +413,8 @@ CCACHE = "${@bb.which(d.getVar('PATH', True), 'ccache') and 'ccache '}"
 TOOLCHAIN_OPTIONS = " --sysroot=${STAGING_DIR_TARGET}"
 
 export CCACHE_DIR = "${TMPDIR}/ccache/${MULTIMACH_HOST_SYS}/${PN}"
+# The sstate cache dependencies should not depend on the value of CCACHE_DIR
+CCACHE_DIR[undep] = "1"
 export CC = "${CCACHE}${HOST_PREFIX}gcc ${HOST_CC_ARCH}${TOOLCHAIN_OPTIONS}"
 export CXX = "${CCACHE}${HOST_PREFIX}g++ ${HOST_CC_ARCH}${TOOLCHAIN_OPTIONS}"
 export F77 = "${CCACHE}${HOST_PREFIX}g77 ${HOST_CC_ARCH}${TOOLCHAIN_OPTIONS}"
-- 
1.7.1