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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
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<head>
<title>
Autoconf Macro: etr_socket_nsl
</title>
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<a href="http://autoconf-archive.cryp.to/etr_socket_nsl.m4">Download M4
Source</a>
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<hr>
<h1>
etr_socket_nsl
</h1>
<h2>
Obsolete Macro
</h2>
<p class="indent">
Use LIB_SOCKET_NSL instead.
</p>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>ETR_SOCKET_NSL</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
This macro figures out what libraries are required on this platform to link
sockets programs. It's usually -lsocket and/or -lnsl or neither. We test
for all three combinations.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Warren Young <warren@etr-usa.com>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-09-02
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([ETR_SOCKET_NSL],
[
AC_CACHE_CHECK(for libraries containing socket functions,
ac_cv_socket_libs, [
oCFLAGS=$CFLAGS
AC_TRY_LINK([
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
],
[
struct in_addr add;
int sd = socket(AF_INET, SOCK_STREAM, 0);
inet_ntoa(add);
],
ac_cv_socket_libs=-lc, ac_cv_socket_libs=no)
if test x"$ac_cv_socket_libs" = "xno"
then
CFLAGS="$oCFLAGS -lsocket"
AC_TRY_LINK([
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
],
[
struct in_addr add;
int sd = socket(AF_INET, SOCK_STREAM, 0);
inet_ntoa(add);
],
ac_cv_socket_libs=-lsocket, ac_cv_socket_libs=no)
fi
if test x"$ac_cv_socket_libs" = "xno"
then
CFLAGS="$oCFLAGS -lsocket -lnsl"
AC_TRY_LINK([
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
],
[
struct in_addr add;
int sd = socket(AF_INET, SOCK_STREAM, 0);
inet_ntoa(add);
],
ac_cv_socket_libs="-lsocket -lnsl", ac_cv_socket_libs=no)
fi
CFLAGS=$oCFLAGS
])
if test x"$ac_cv_socket_libs" = "xno"
then
AC_MSG_ERROR([Cannot find socket libraries])
elif test x"$ac_cv_socket_libs" = "x-lc"
then
ETR_SOCKET_LIBS=""
else
ETR_SOCKET_LIBS="$ac_cv_socket_libs"
fi
AC_SUBST(ETR_SOCKET_LIBS)
]) dnl ETR_SOCKET_NSL
</pre>
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