Re: [Bug-tar] Please fix the build with gcc 8.1

[Sergey Poznyakoff]

Hi Paul,

The ioctl code needs a good rewrite indeed. However, I'm more concerned
about that:

> /usr/include/bits/socket.h: In function ‘__cmsg_nxthdr’:
> /usr/include/bits/socket.h:315:12: error: cast increases required alignment 
> of target type [-Werror=cast-align]
>    __cmsg = (struct cmsghdr *) ((unsigned char *) __cmsg

The minimal reproducible file is a one-liner:

  #include <netdb.h>

Running
 
  gcc-8 -Wsystem-headers -Wcast-align=strict -Werror -O2 -c 1.c

produces the error above. 

Regards,
Sergey