[lwip-users] Many Warning Messages During Building the lwip 1.2.0

[PAUL . YU 喻浦軒]

I'm using lwip 1.2.0 with FreeRTOS
My compiler is using IAR

When I building my project , there will occur many warning messages :

Warning[Pa039]: use of address of unaligned structure member D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\api\api_lib.c 357

Warning[Pa039]: use of address of unaligned structure member D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\api\api_lib.c 363

Warning[Pa039]: use of address of unaligned structure member D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\api\api_lib.c 367

Warning[Pa039]: use of address of unaligned structure member D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\snmp\mib2.c 2929

Warning[Pe223]: function "etharp_find_addr" declared implicitly D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\snmp\mib2.c 2932

Warning[Pa039]: use of address of unaligned structure member D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\snmp\mib2.c 3267

Warning[Pa039]: use of address of unaligned structure member D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\snmp\mib2.c 3605

Warning[Pe223]: function "etharp_find_addr" declared implicitly D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\snmp\mib2.c 3608

Warning[Pa039]: use of address of unaligned structure member D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\snmp\mib2.c 4065

Warning[Pa039]: use of address of unaligned structure member D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\core\tcp.c 140
Warning[Pa039]: use of address of unaligned structure member D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\core\tcp.c 318
Warning[Pa039]: use of address of unaligned structure member D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\core\tcp.c 318
tcp_in.c
Warning[Pe236]: controlling _expression_ is constant D:\Project\1116\Demo\ARM9_STR91X_IAR\lwip\core\tcp_in.c 299

Linking
Warning[w35]: There is more than one definition for the struct/union type with tag 'raw_pcb'; class/struct/union types have different sizes

Warning[w35]: There is more than one definition for the struct/union type with tag 'netconn'; class/struct/union field/base types do not match for field/base 

'pcb'; class/struct/union field/base types do not match for field/base 'raw'; class/struct/union types have different sizes

Warning[w35]: There is more than one definition for the struct/union type with tag 'api_msg_msg'; class/struct/union field/base types do not match for 

field/base 'conn'; class/struct/union field/base types do not match for field/base 'pcb'; class/struct/union field/base types do not match for field/base 'raw'; 

class/struct/union types have different sizes
Warning[w35]: There is more than one definition for the struct/union type with tag 'api_msg'; class/struct/union field/base types do not match for field/base 

'msg'; class/struct/union field/base types do not match for field/base 'conn'; class/struct/union field/base types do not match for field/base 'pcb'; 

class/struct/union field/base types do not match for field/base 'raw'; class/struct/union types have different sizes
Warning[w35]: There is more than one definition for the struct/union type with tag 'mib_list_rootnode'; class/struct/union types have different sizes

I don't know if these warning will cause my system unstable or not ,
how can I fix them ?

Paul

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