| 1 | # socketlib.m4 serial 3
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| 2 | dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl gl_SOCKETLIB
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| 8 | dnl Determines the library to use for socket functions.
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| 9 | dnl Sets and AC_SUBSTs LIBSOCKET.
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| 10 |
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| 11 | AC_DEFUN([gl_SOCKETLIB],
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| 12 | [
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| 13 | gl_PREREQ_SYS_H_WINSOCK2 dnl for HAVE_WINSOCK2_H
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| 14 | LIBSOCKET=
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| 15 | if test $HAVE_WINSOCK2_H = 1; then
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| 16 | dnl Native Windows API (not Cygwin).
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| 17 | dnl If the function WSAStartup exists (declared in <winsock2.h> and
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| 18 | dnl defined through -lws2_32), we need to call it.
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| 19 | AC_CACHE_CHECK([for WSAStartup],
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| 20 | [gl_cv_func_wsastartup], [
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| 21 | gl_save_LIBS="$LIBS"
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| 22 | LIBS="$LIBS -lws2_32"
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| 23 | AC_LINK_IFELSE(
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| 24 | [AC_LANG_PROGRAM([[
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| 25 | #ifdef HAVE_WINSOCK2_H
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| 26 | # include <winsock2.h>
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| 27 | #endif]], [[
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| 28 | WORD wVersionRequested = MAKEWORD(1, 1);
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| 29 | WSADATA wsaData;
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| 30 | int err = WSAStartup(wVersionRequested, &wsaData);
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| 31 | WSACleanup ();
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| 32 | ]])
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| 33 | ],
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| 34 | [gl_cv_func_wsastartup=yes],
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| 35 | [gl_cv_func_wsastartup=no])
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| 36 | LIBS="$gl_save_LIBS"
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| 37 | ])
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| 38 | if test "$gl_cv_func_wsastartup" = "yes"; then
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| 39 | AC_DEFINE([WINDOWS_SOCKETS], [1], [Define if WSAStartup is needed.])
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| 40 | LIBSOCKET='-lws2_32'
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| 41 | fi
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| 42 | else
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| 43 | dnl Unix API.
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| 44 | dnl Solaris has most socket functions in libsocket.
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| 45 | dnl Haiku has most socket functions in libnetwork.
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| 46 | dnl BeOS has most socket functions in libnet.
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| 47 | dnl On HP-UX, do NOT link with libxnet, because in 64-bit mode this would
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| 48 | dnl break code (e.g. in libraries) that invokes accept(), getpeername(),
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| 49 | dnl getsockname(), getsockopt(), or recvfrom() with a 32-bit addrlen. See
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| 50 | dnl "man xopen_networking" for details.
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| 51 | AC_CACHE_CHECK([for library containing setsockopt], [gl_cv_lib_socket], [
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| 52 | gl_cv_lib_socket=
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| 53 | AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
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| 54 | #ifdef __cplusplus
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| 55 | "C"
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| 56 | #endif
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| 57 | char setsockopt();]], [[setsockopt();]])],
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| 58 | [],
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| 59 | [gl_save_LIBS="$LIBS"
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| 60 | LIBS="$gl_save_LIBS -lsocket"
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| 61 | AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
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| 62 | #ifdef __cplusplus
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| 63 | "C"
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| 64 | #endif
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| 65 | char setsockopt();]], [[setsockopt();]])],
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| 66 | [gl_cv_lib_socket="-lsocket"])
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| 67 | if test -z "$gl_cv_lib_socket"; then
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| 68 | LIBS="$gl_save_LIBS -lnetwork"
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| 69 | AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
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| 70 | #ifdef __cplusplus
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| 71 | "C"
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| 72 | #endif
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| 73 | char setsockopt();]], [[setsockopt();]])],
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| 74 | [gl_cv_lib_socket="-lnetwork"])
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| 75 | if test -z "$gl_cv_lib_socket"; then
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| 76 | LIBS="$gl_save_LIBS -lnet"
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| 77 | AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
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| 78 | #ifdef __cplusplus
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| 79 | "C"
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| 80 | #endif
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| 81 | char setsockopt();]], [[setsockopt();]])],
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| 82 | [gl_cv_lib_socket="-lnet"])
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| 83 | fi
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| 84 | fi
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| 85 | LIBS="$gl_save_LIBS"
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| 86 | ])
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| 87 | if test -z "$gl_cv_lib_socket"; then
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| 88 | gl_cv_lib_socket="none needed"
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| 89 | fi
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| 90 | ])
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| 91 | if test "$gl_cv_lib_socket" != "none needed"; then
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| 92 | LIBSOCKET="$gl_cv_lib_socket"
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| 93 | fi
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| 94 | fi
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| 95 | AC_SUBST([LIBSOCKET])
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| 96 | ])
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