# socketlib.m4 serial 1

dnl Copyright (C) 2008-2017 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

dnl gl_SOCKETLIB

dnl Determines the library to use for socket functions.

dnl Sets and AC_SUBSTs LIBSOCKET.

AC_DEFUN([gl_SOCKETLIB],

[

  gl_PREREQ_SYS_H_WINSOCK2 dnl for HAVE_WINSOCK2_H

  LIBSOCKET=

  if test $HAVE_WINSOCK2_H = 1; then

    dnl Native Windows API (not Cygwin).

    AC_CACHE_CHECK([if we need to call WSAStartup in winsock2.h and -lws2_32],

                   [gl_cv_func_wsastartup], [

      gl_save_LIBS="$LIBS"

      LIBS="$LIBS -lws2_32"

      AC_LINK_IFELSE([AC_LANG_PROGRAM([[

#ifdef HAVE_WINSOCK2_H

# include <winsock2.h>

#endif]], [[

          WORD wVersionRequested = MAKEWORD(1, 1);

          WSADATA wsaData;

          int err = WSAStartup(wVersionRequested, &wsaData);

          WSACleanup ();]])],

        gl_cv_func_wsastartup=yes, gl_cv_func_wsastartup=no)

      LIBS="$gl_save_LIBS"

    ])

    if test "$gl_cv_func_wsastartup" = "yes"; then

      AC_DEFINE([WINDOWS_SOCKETS], [1], [Define if WSAStartup is needed.])

      LIBSOCKET='-lws2_32'

    fi

  else

    dnl Unix API.

    dnl Solaris has most socket functions in libsocket.

    dnl Haiku has most socket functions in libnetwork.

    dnl BeOS has most socket functions in libnet.

    AC_CACHE_CHECK([for library containing setsockopt], [gl_cv_lib_socket], [

      gl_cv_lib_socket=

      AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern

#ifdef __cplusplus

"C"

#endif

char setsockopt();]], [[setsockopt();]])],

        [],

        [gl_save_LIBS="$LIBS"

         LIBS="$gl_save_LIBS -lsocket"

         AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern

#ifdef __cplusplus

"C"

#endif

char setsockopt();]], [[setsockopt();]])],

           [gl_cv_lib_socket="-lsocket"])

         if test -z "$gl_cv_lib_socket"; then

           LIBS="$gl_save_LIBS -lnetwork"

           AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern

#ifdef __cplusplus

"C"

#endif

char setsockopt();]], [[setsockopt();]])],

             [gl_cv_lib_socket="-lnetwork"])

           if test -z "$gl_cv_lib_socket"; then

             LIBS="$gl_save_LIBS -lnet"

             AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern

#ifdef __cplusplus

"C"

#endif

char setsockopt();]], [[setsockopt();]])],

               [gl_cv_lib_socket="-lnet"])

           fi

         fi

         LIBS="$gl_save_LIBS"

        ])

      if test -z "$gl_cv_lib_socket"; then

        gl_cv_lib_socket="none needed"

      fi

    ])

    if test "$gl_cv_lib_socket" != "none needed"; then

      LIBSOCKET="$gl_cv_lib_socket"

    fi

  fi

  AC_SUBST([LIBSOCKET])

])