freebsd-dev/contrib/ntp/sntp/m4/ntp_af_unspec.m4
2018-02-28 07:59:55 +00:00

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dnl ######################################################################
dnl AF_UNSPEC checks
AC_DEFUN([NTP_AF_UNSPEC], [
# We could do a cv check here, but is it worth it?
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[
#include <sys/socket.h>
#ifndef AF_UNSPEC
#include "Bletch: AF_UNSPEC is undefined!"
#endif
#if AF_UNSPEC != 0
#include "Bletch: AF_UNSPEC != 0"
#endif
]],
[AC_MSG_NOTICE([AF_UNSPEC is zero, as expected.])],
[AC_MSG_ERROR([AF_UNSPEC is not zero on this platform!])]
)]
)])
dnl ######################################################################