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Remove configure probe for sockaddr_in6 and require AF_INET6.

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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
This commit is contained in:
Thomas Munro
2022-08-26 10:13:22 +12:00
parent 28ec316787
commit bcc8b14ef6
16 changed files with 7 additions and 105 deletions
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6
configure.ac
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@ -1801,12 +1801,6 @@ AC_CHECK_DECLS([pwritev], [], [AC_LIBOBJ(pwritev)], [#include <sys/uio.h>])
# This is probably only present on macOS, but may as well check always
AC_CHECK_DECLS(F_FULLFSYNC, [], [], [#include <fcntl.h>])
AC_CHECK_TYPE([struct sockaddr_in6],
[AC_DEFINE(HAVE_IPV6, 1, [Define to 1 if you have support for IPv6.])],
[],
[$ac_includes_default
#include <netinet/in.h>])
AC_CACHE_CHECK([for PS_STRINGS], [pgac_cv_var_PS_STRINGS],
[AC_LINK_IFELSE([AC_LANG_PROGRAM(
[#include <machine/vmparam.h>