Explicitly ignore return value or bare expression (macro expands to a number)
Explicitly ignore return value or bare expression (macro expands to a number)

Compile: lwip_stack.c
In file included from ../features/FEATURE_LWIP/lwip-interface/lwip_stack.c:41:0:
../features/FEATURE_LWIP/lwip-interface/lwip_stack.c: In function 'mbed_lwip_bringup_2':
../features/FEATURE_LWIP/lwip-interface/ppp_lwip.h:58:44: warning: statement with no effect [-Wunused-value]
 #define ppp_lwip_disconnect()              ERR_IF
                                            ^
../features/FEATURE_LWIP/lwip-interface/lwip_stack.c:858:21: note: in expansion of macro 'ppp_lwip_disconnect'
                     ppp_lwip_disconnect();
                     ^~~~~~~~~~~~~~~~~~~
../features/FEATURE_LWIP/lwip-interface/ppp_lwip.h:58:44: warning: statement with no effect [-Wunused-value]
 #define ppp_lwip_disconnect()              ERR_IF
                                            ^
../features/FEATURE_LWIP/lwip-interface/lwip_stack.c:875:21: note: in expansion of macro 'ppp_lwip_disconnect'
                     ppp_lwip_disconnect();

                     ^~~~~~~~~~~~~~~~~~~

mbedmicro/mbed,c1728p9/mbed-os,andcor02/mbed-os,c1728p9/mbed-os,betzw/mbed-os,mbedmicro/mbed,mbedmicro/mbed,andcor02/mbed-os,betzw/mbed-os,c1728p9/mbed-os,c1728p9/mbed-os,andcor02/mbed-os,betzw/mbed-os,betzw/mbed-os,kjbracey-arm/mbed,mbedmicro/mbed,kjbracey-arm/mbed,c1728p9/mbed-os,andcor02/mbed-os,betzw/mbed-os,kjbracey-arm/mbed,betzw/mbed-os,andcor02/mbed-os,mbedmicro/mbed,c1728p9/mbed-os,andcor02/mbed-os,kjbracey-arm/mbed