-Wno- 加上对应的变量或参数类型，即可忽略当前警告，编译通过。

    如：
    CFLAGS += -Wno-unused-but-set-variableCFLAGS += -Wno-unused-variable
    CFLAGS += -Wno-unused-result
    CFLAGS += -Wno-maybe-uninitialized
    CFLAGS += -Wno-parentheses
    CFLAGS += -Wno-sign-compare

    参考：
    链接