configure: Enable new warning options added in GCC 6.

-Wnull-dereference is also new in GCC 6 but upon testing it produces far
too many false positives to be usable for OVS.

Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Andy Zhou <azhou@ovn.org>

diff --git a/configure.ac b/configure.ac
index b3ade95e5204e0e8e286da7d9b60b05dec0e049a..441423059b3856c50c3c4c748633fc6e5ddb2326 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -162,6 +162,8 @@ OVS_ENABLE_OPTION([-Wswitch-bool])
 OVS_ENABLE_OPTION([-Wlogical-not-parentheses])
 OVS_ENABLE_OPTION([-Wsizeof-array-argument])
 OVS_ENABLE_OPTION([-Wbool-compare])
+OVS_ENABLE_OPTION([-Wshift-negative-value])
+OVS_ENABLE_OPTION([-Wduplicated-cond])
 OVS_ENABLE_OPTION([-Qunused-arguments])
 OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
 OVS_CONDITIONAL_CC_OPTION([-Wno-unused-parameter], [HAVE_WNO_UNUSED_PARAMETER])