siteconfig: Clear cache before rebuilding

This ensures consistent build results and avoids build failures when compiler flags
change for example.

(From OE-Core rev: a5ff8396cad130f809f8f8da49bb38e6f80f923c)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/meta/classes/siteconfig.bbclass b/meta/classes/siteconfig.bbclass
index ccbe5b99c9..3701b7cd81 100644
--- a/meta/classes/siteconfig.bbclass
+++ b/meta/classes/siteconfig.bbclass
@@ -18,6 +18,7 @@ siteconfig_do_siteconfig_gencache () {
                 >${WORKDIR}/site_config_${MACHINE}/configure.ac
         cd ${WORKDIR}/site_config_${MACHINE}
         autoconf
+        rm -f ${PN}_cache
         CONFIG_SITE="" ${EXTRASITECONFIG} ./configure ${CONFIGUREOPTS} --cache-file ${PN}_cache
         sed -n -e "/ac_cv_c_bigendian/p" -e "/ac_cv_sizeof_/p" \
                 -e "/ac_cv_type_/p" -e "/ac_cv_header_/p" -e "/ac_cv_func_/p" \