Re: correctly including -lnsl and -lsocket on Solaris without impacting other OS's

[Stephane Bortzmeyer]

On Fri, Apr 20, 2007 at 01:10:22PM +0000,
 address@hidden <address@hidden> wrote 
 a message of 93 lines which said:

> The three specific checks for "Solaris" find the libraries, but
> don't set the appropriate HAVE_<function-name> variables in
> config.h.

This is what I use (stolen from lynx, according to the comments I've
put in the file) and it seems to work on Solaris, Tru64, NetBSD and
glibc/Linux systems.

acinclude.m4:

dnl Useful macros to check libraries which are not implicit 
dnl in Solaris, for instance.
AC_DEFUN([CF_LIB_NSL],
[
AC_CHECK_LIB(nsl,gethostbyname,
[
AC_MSG_CHECKING(if libnsl is mandatory)
AC_TRY_LINK([#include <sys/types.h>
             #include <netinet/in.h>
             char *domain;  ], 
 [gethostbyname(domain)], dnl
 [AC_MSG_RESULT(no)], dnl
 [AC_MSG_RESULT(yes); LIBS="${LIBS} -lnsl"])
]) 
])
AC_DEFUN([CF_LIB_SOCKET],
[
AC_CHECK_LIB(socket,socket,
[
AC_MSG_CHECKING(if libsocket is mandatory)
AC_TRY_LINK([#include <sys/types.h>
             #include <netinet/in.h>
             union
             {
                HEADER hdr;
                u_char buf[512];
             }
             response;
             char *domain;
             int requested_type;        ], 
 [socket (AF_INET, SOCK_STREAM, 0) ], dnl
 [AC_MSG_RESULT(no)], dnl
 [AC_MSG_RESULT(yes); LIBS="${LIBS} -lsocket"]) 
])
])

configure.ac:

CF_LIB_SOCKET
CF_LIB_NSL