AX_CFLAGS_GCC_OPTION([-Wextra], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wformat], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wformat-security], [LLDP_CFLAGS])
+AX_CFLAGS_GCC_OPTION([-Wimplicit-fallthrough], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wfatal-errors], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wcast-align], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wheader-guard], [LLDP_CFLAGS])