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

[Pavel Raiskup]

On Friday, August 3, 2018 12:48:07 PM CET Paul Eggert wrote:
> Sergey Poznyakoff wrote:
> > 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.
> 
> Although that's annoying, it's a false alarm, since the code properly aligns 
> the 
> pointer before using it by using CMSG_ALIGN. The warning in rtapelib.c, 
> though, 
> is not so obviously a false alarm.

Ping on this.

Pavel