m4/ax_lib_socket_nsl.m4

   1 # ===========================================================================
   2 #    https://www.gnu.org/software/autoconf-archive/ax_lib_socket_nsl.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_LIB_SOCKET_NSL
   8 #
   9 # DESCRIPTION
  10 #
  11 #   This macro figures out what libraries are required on this platform to
  12 #   link sockets programs.
  13 #
  14 #   The common cases are not to need any extra libraries, or to need
  15 #   -lsocket and -lnsl. We need to avoid linking with libnsl unless we need
  16 #   it, though, since on some OSes where it isn't necessary it will totally
  17 #   break networking. Unisys also includes gethostbyname() in libsocket but
  18 #   needs libnsl for socket().
  19 #
  20 # LICENSE
  21 #
  22 #   Copyright (c) 2008 Russ Allbery <rra@stanford.edu>
  23 #   Copyright (c) 2008 Stepan Kasal <kasal@ucw.cz>
  24 #   Copyright (c) 2008 Warren Young <warren@etr-usa.com>
  25 #
  26 #   Copying and distribution of this file, with or without modification, are
  27 #   permitted in any medium without royalty provided the copyright notice
  28 #   and this notice are preserved. This file is offered as-is, without any
  29 #   warranty.
  30
  31 #serial 7
  32
  33 AU_ALIAS([LIB_SOCKET_NSL], [AX_LIB_SOCKET_NSL])
  34 AC_DEFUN([AX_LIB_SOCKET_NSL],
  35 [
  36         AC_SEARCH_LIBS([gethostbyname], [nsl])
  37         AC_SEARCH_LIBS([socket], [socket], [], [
  38                 AC_CHECK_LIB([socket], [socket], [LIBS="-lsocket -lnsl $LIBS"],
  39                 [], [-lnsl])])
  40 ])