[lwip-devel] Build issue if setting ARP_TABLE_SIZE/LWIP_ND6_NUM_DESTINATIONS > 0x7f

[Axel Lin]

With the changes in commit 0c2fdfcf428f ("Fix bug #53667: ARP table
max size is to small")
It seems allows setting a bigger value for
ARP_TABLE_SIZE/LWIP_ND6_NUM_DESTINATIONS:

However, with below defines:
#define ARP_TABLE_SIZE 0x80
Then got:

../../../../lwip/src/core/ipv4/etharp.c:129:2: error: #error
"ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your
lwipopts.h"
 #error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in
your lwipopts.h"
  ^~~~~

#define LWIP_ND6_NUM_DESTINATIONS 0x80
Then got:

../../../../lwip/src/core/ipv6/nd6.c: In function ‘nd6_tmr’:
../../../../lwip/src/core/ipv6/nd6.c:1022:17: error: comparison is
always true due to limited range of data type [-Werror=type-limits]
   for (i = 0; i < LWIP_ND6_NUM_DESTINATIONS; i++) {
                 ^
../../../../lwip/src/core/ipv6/nd6.c:1034:23: error: comparison is
always true due to limited range of data type [-Werror=type-limits]
         for (j = 0; j < LWIP_ND6_NUM_DESTINATIONS; j++) {
                       ^
cc1: all warnings being treated as errors