哪个gcc开关禁用“逗号的左手操作数无效”警告？

It's a part of larger code base, which forces -Werror on gcc. This warning is generated in a third party code that shouldn't be changed (and I actually know how to fix it), but I can disable specific warnings. This time man gcc failed me, so please, let some gcc master enlighten me. TIA.It's a part of larger code base, which forces -