We have required a v9 cpu since 9b9c37c36439ee0452632253dac7a31897f27f70.
However, the flags we were using did not reliably enable v8plus, which
meant that the compiler didn't know it could inline 64-bit atomics.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 configure | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index fbb6a93..13e040d 100755
--- a/configure
+++ b/configure
@@ -1213,12 +1213,12 @@ case "$cpu" in
            LDFLAGS="-m64 $LDFLAGS"
            ;;
     sparc)
-           LDFLAGS="-m32 $LDFLAGS"
-           CPU_CFLAGS="-m32 -mcpu=ultrasparc"
+           CPU_CFLAGS="-m32 -mv8plus -mcpu=ultrasparc"
+           LDFLAGS="-m32 -mv8plus $LDFLAGS"
            ;;
     sparc64)
-           LDFLAGS="-m64 $LDFLAGS"
            CPU_CFLAGS="-m64 -mcpu=ultrasparc"
+           LDFLAGS="-m64 $LDFLAGS"
            ;;
     s390)
            CPU_CFLAGS="-m31"
-- 
2.9.4