[Bug c++/60978] -Wenum-compare warns too eagerly

["ppluzhnikov at google dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60978

--- Comment #9 from Paul Pluzhnikov <ppluzhnikov at google dot com> ---
(In reply to Jason Merrill from comment #8)

> You shouldn't get the warning about IPPROTO_ICMP vs IPPROTO_ICMPV66, as they
> are members of the same anonymous enum.

They are?

In glibc-2.19, include/netinet/in.h:


/* Standard well-defined IP protocols.  */
enum
  {
    IPPROTO_IP = 0,       /* Dummy protocol for TCP.  */
#define IPPROTO_IP        IPPROTO_IP
    IPPROTO_ICMP = 1,       /* Internet Control Message Protocol.  */
#define IPPROTO_ICMP        IPPROTO_ICMP
...
};

/* If __USE_KERNEL_IPV6_DEFS is defined then the user has included the kernel
   network headers first and we should use those ABI-identical definitions
   instead of our own.  */
#ifndef __USE_KERNEL_IPV6_DEFS
enum
  {
    IPPROTO_HOPOPTS = 0,   /* IPv6 Hop-by-Hop options.  */
...
    IPPROTO_ICMPV6 = 58,   /* ICMPv6.  */
...
};


Looks like different anonymous enums to me.