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Author ronaldoussoren
Recipients chrysn, ned.deily, ronaldoussoren
Date 2018-12-23.15:15:45
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1545578146.09.0.0770528567349.issue35569@roundup.psfhosted.org>
In-reply-to
Content 
#include <netinet6/in6.h> in the macOS 10.14 SDK says:

/*
 * RFC 3542 define the following socket options in a manner incompatible
 * with RFC 2292:
 *   IPV6_PKTINFO
 *   IPV6_HOPLIMIT
 *   IPV6_NEXTHOP
 *   IPV6_HOPOPTS
 *   IPV6_DSTOPTS
 *   IPV6_RTHDR
 *
 * To use the new IPv6 Sockets options introduced by RFC 3542
 * the constant __APPLE_USE_RFC_3542 must be defined before
 * including <netinet/in.h>
 *
 * To use the old IPv6 Sockets options from RFC 2292
 * the constant __APPLE_USE_RFC_2292 must be defined before
 * including <netinet/in.h>
 *
 * Note that eventually RFC 3542 is going to be the
 * default and RFC 2292 will be obsolete.
 */

My conclusion from reading this: the name might suggest that this is an internal macro, but should be safe to use.
History
Date User Action Args
2018-12-23 15:15:48ronaldoussorensetrecipients: + ronaldoussoren, ned.deily, chrysn
2018-12-23 15:15:46ronaldoussorensetmessageid: <1545578146.09.0.0770528567349.issue35569@roundup.psfhosted.org>
2018-12-23 15:15:46ronaldoussorenlinkissue35569 messages
2018-12-23 15:15:45ronaldoussorencreate