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SUSv3 <netinet/in.h> defines struct sockaddr_in6, and all targeted Unix systems have it. Windows has it in <ws2ipdef.h>. Remove the configure probe, the macro and a small amount of dead code. Also remove a mention of IPv6-less builds from the documentation, since there aren't any. This is similar to commits f5580882 and 077bf2f2 for Unix sockets. Even though AF_INET6 is an "optional" component of SUSv3, there are no known modern operating system without it, and it seems even less likely to be omitted from future systems than AF_UNIX. Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/CA+hUKGKErNfhmvb_H0UprEmp4LPzGN06yR2_0tYikjzB-2ECMw@mail.gmail.com
src/tools/ifaddrs/README test_ifaddrs ============ This program prints the addresses and netmasks of all the IPv4 and IPv6 interfaces on the local machine. It is useful for testing that this functionality works on various platforms. If "samehost" and "samenet" in pg_hba.conf don't seem to work right, run this program to see what is happening. Usage: test_ifaddrs