]> git.sur5r.net Git - openldap/blobdiff - build/openldap.m4
Revamp chapter 1
[openldap] / build / openldap.m4
index 1ace3af743b6b57509b047e35ddf0f72d5ce2fff..a12b0a2577d9dff5a6aa7e0435c95afbf2ebab2c 100644 (file)
@@ -1,6 +1,6 @@
 dnl $OpenLDAP$
 dnl
-dnl Copyright 1998-1999 The OpenLDAP Foundation,  All Rights Reserved.
+dnl Copyright 1998-2000 The OpenLDAP Foundation,  All Rights Reserved.
 dnl COPYING RESTRICTIONS APPLY, See COPYRIGHT file
 dnl
 dnl OpenLDAP Autoconf Macros
@@ -56,6 +56,33 @@ dnl AC_VERBOSE(OpenLDAP --with-$1 $ol_with_$1)
 ])dnl
 dnl
 dnl ====================================================================
+dnl
+AC_DEFUN(AC_COMPILE_CHECK_SIZEOF,
+[changequote(<<, >>)dnl 
+dnl The name to #define. 
+define(<<AC_TYPE_NAME>>, translit(sizeof_$1, [a-z *], [A-Z_P]))dnl 
+dnl The cache variable name. 
+define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl 
+changequote([, ])dnl 
+AC_MSG_CHECKING(size of $1) 
+AC_CACHE_VAL(AC_CV_NAME, 
+[for ac_size in 4 8 1 2 16 $2 ; do # List sizes in rough order of prevalence. 
+  AC_TRY_COMPILE([#include "confdefs.h" 
+#include <sys/types.h> 
+$2 
+], [switch (0) case 0: case (sizeof ($1) == $ac_size):;], AC_CV_NAME=$ac_size) 
+  if test x$AC_CV_NAME != x ; then break; fi 
+done 
+]) 
+if test x$AC_CV_NAME = x ; then 
+  AC_MSG_ERROR([cannot determine a size for $1]) 
+fi 
+AC_MSG_RESULT($AC_CV_NAME) 
+AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The number of bytes in type $1]) 
+undefine([AC_TYPE_NAME])dnl 
+undefine([AC_CV_NAME])dnl 
+])
+dnl ====================================================================
 dnl check if hard links are supported.
 dnl
 AC_DEFUN([OL_PROG_LN_H], [# test for ln hardlink support
@@ -211,92 +238,97 @@ fi
 ])
 dnl
 dnl ====================================================================
-dnl Check if db.h is Berkeley DB2
+dnl Berkeley DB macros
 dnl
-dnl defines ol_cv_header_db2 to 'yes' or 'no'
-dnl
-dnl uses:
-dnl            AC_CHECK_HEADERS(db.h)
-dnl
-AC_DEFUN([OL_HEADER_BERKELEY_DB2],
-[AC_CHECK_HEADERS(db.h)
-if test $ac_cv_header_db_h = yes ; then
-       AC_CACHE_CHECK([if db.h is DB2], [ol_cv_header_db2],[
-               AC_EGREP_CPP(__db_version_2,[
-#                      include <db.h>
-                       /* this check could be improved */
-#                      ifdef DB_VERSION_MAJOR
-#                              if DB_VERSION_MAJOR == 2
-                                       __db_version_2;
-#                              endif
-#                      endif
-               ], ol_cv_header_db2=yes, ol_cv_header_db2=no)])
-else
-       ol_cv_header_db2=no
-fi
-])dnl
 dnl --------------------------------------------------------------------
-dnl Check if Berkeley DB2 library exists
-dnl Check for dbopen in standard libraries or -ldb
-dnl
-dnl defines ol_cv_lib_db2 to '-ldb' or 'no'
-dnl
-dnl uses:
-dnl            AC_CHECK_LIB(db,db_appexit)
-dnl
-AC_DEFUN([OL_LIB_BERKELEY_DB2],
-[AC_CACHE_CHECK([for DB2 library], [ol_cv_lib_db2],
-[      ol_LIBS="$LIBS"
-       AC_CHECK_LIB(db,db_appexit,[ol_cv_lib_db2=-ldb],[ol_cv_lib_db2=no])
+dnl Try to link
+AC_DEFUN([OL_BERKELEY_DB_TRY],
+[if test $ol_cv_lib_db = no ; then
+       AC_CACHE_CHECK([for Berkeley DB link (]ifelse($2,,default,$2)[)],[$1],
+[
+       ol_DB_LIB=ifelse($2,,,$2)
+       ol_LIBS=$LIBS
+       LIBS="$ol_DB_LIB $LIBS"
+
+       AC_TRY_LINK([
+#ifdef HAVE_DB_185_H
+# include <db_185.h>
+#else
+# include <db.h>
+#endif
+
+#ifndef DB_VERSION_MAJOR
+# define DB_VERSION_MAJOR 1
+#endif
+
+#ifndef NULL
+#define NULL ((void*)0)
+#endif
+],[
+#if DB_VERSION_MAJOR > 2
+       db_env_create( NULL, 0 );
+#elif DB_VERSION_MAJOR > 1
+       db_appexit( NULL );
+#else
+       (void) dbopen( NULL, 0, 0, 0, NULL);
+#endif
+],[$1=yes],[$1=no])
+
        LIBS="$ol_LIBS"
 ])
-])dnl
-dnl
-dnl --------------------------------------------------------------------
-dnl Check if Berkeley db2 exists
-dnl
-dnl defines ol_cv_berkeley_db2 to 'yes' or 'no'
-dnl 
-dnl uses:
-dnl            OL_LIB_BERKELEY_DB2
-dnl            OL_HEADER_BERKELEY_DB2
-dnl
-AC_DEFUN([OL_BERKELEY_DB2],
-[AC_REQUIRE([OL_LIB_BERKELEY_DB2])
- AC_REQUIRE([OL_HEADER_BERKELEY_DB2])
- AC_CACHE_CHECK([for Berkeley DB2], [ol_cv_berkeley_db2], [
-       if test "$ol_cv_lib_db2" = no -o "$ol_cv_header_db2" = no ; then
-               ol_cv_berkeley_db2=no
-       else
-               ol_cv_berkeley_db2=yes
+
+       if test $$1 = yes ; then
+               ol_cv_lib_db=ifelse($2,,yes,$2)
        fi
+fi
 ])
- if test $ol_cv_berkeley_db2 = yes ; then
-       AC_DEFINE(HAVE_BERKELEY_DB2,1, [define if Berkeley DBv2 is available])
- fi
-])dnl
 dnl
+dnl --------------------------------------------------------------------
+dnl Try to locate appropriate library
+AC_DEFUN([OL_BERKELEY_DB_LINK],
+[ol_cv_lib_db=no
+OL_BERKELEY_DB_TRY(ol_cv_db_none)
+OL_BERKELEY_DB_TRY(ol_cv_db_db,[-ldb])
+OL_BERKELEY_DB_TRY(ol_cv_db_db3,[-ldb3])
+OL_BERKELEY_DB_TRY(ol_cv_db_db2,[-ldb2])
+OL_BERKELEY_DB_TRY(ol_cv_db_db1,[-ldb1])
+])
 dnl
 dnl --------------------------------------------------------------------
-dnl Check if Berkeley db2 supports DB_THREAD
-AC_DEFUN([OL_BERKELEY_DB2_DB_THREAD],
-[AC_CACHE_CHECK([for DB_THREAD support], [ol_cv_berkeley_db2_db_thread], [
+dnl Check if Berkeley DB supports DB_THREAD
+AC_DEFUN([OL_BERKELEY_DB_THREAD],
+[AC_CACHE_CHECK([for Berkeley DB thread support], [ol_cv_berkeley_db_thread], [
        ol_LIBS="$LIBS"
-       if test $ol_cv_lib_db2 != yes ; then
-               LIBS="$ol_cv_lib_db2"
+       if test $ol_cv_lib_db != yes ; then
+               LIBS="$ol_cv_lib_db"
        fi
 
        AC_TRY_RUN([
+#ifdef HAVE_DB_185_H
+       choke me;
+#else
 #include <db.h>
+#endif
 #ifndef NULL
 #define NULL ((void *)0)
 #endif
 main()
 {
        int rc;
-       DB_ENV env;
        u_int32_t flags = DB_CREATE | DB_THREAD;
 
+
+#if DB_VERSION_MAJOR > 2
+       DB_ENV *env = NULL;
+
+       rc = db_env_create( &env, 0 );
+
+       if( rc == 0 ) {
+               rc = env->open( env, NULL, NULL, flags, 0 );
+       }
+
+#else
+       DB_ENV env;
        memset( &env, '\0', sizeof(env) );
 
        rc = db_appinit( NULL, NULL, &env, flags );
@@ -304,90 +336,68 @@ main()
        if( rc == 0 ) {
                db_appexit( &env );
        }
+#endif
 
        return rc;
 }],
-       [ol_cv_berkeley_db2_db_thread=yes],
-       [ol_cv_berkeley_db2_db_thread=no],
-       [ol_cv_berkeley_db2_db_thread=cross])
+       [ol_cv_berkeley_db_thread=yes],
+       [ol_cv_berkeley_db_thread=no],
+       [ol_cv_berkeley_db_thread=cross])
 
        LIBS="$ol_LIBS"
 
-       if test $ol_cv_berkeley_db2_db_thread != no ; then
-               AC_DEFINE(HAVE_BERKELEY_DB2_DB_THREAD, 1,
-                       [define if BerkeleyDB2 has DB_THREAD support])
+       if test $ol_cv_berkeley_db_thread != no ; then
+               AC_DEFINE(HAVE_BERKELEY_DB_THREAD, 1,
+                       [define if Berkeley DB has DB_THREAD support])
        fi
 ])])dnl
-dnl ====================================================================
-dnl Check for db.h/db_185.h is Berkeley DB
-dnl
-dnl defines ol_cv_header_db to 'yes' or 'no'
-dnl
-dnl uses:
-dnl            OL_HEADER_BERKELEY_DB2
-dnl            AC_CHECK_HEADERS(db_185.h)
-dnl
-AC_DEFUN([OL_HEADER_BERKELEY_DB],
-[AC_REQUIRE([OL_HEADER_BERKELEY_DB2])
-AC_CHECK_HEADERS(db_185.h)
-if test "$ol_cv_header_db2" = yes ; then
-       dnl db.h is db2! 
-
-       ol_cv_header_db=$ac_cv_header_db_185_h
-else
-       ol_cv_header_db=$ac_cv_header_db_h
-fi
-])dnl
 dnl
 dnl --------------------------------------------------------------------
-dnl Check if Berkeley DB library exists
-dnl Check for dbopen in standard libraries or -ldb
-dnl
-dnl defines ol_cv_lib_db to 'yes' or '-ldb' or 'no'
-dnl            'yes' implies dbopen is in $LIBS
-dnl
-dnl uses:
-dnl            AC_CHECK_FUNC(dbopen)
-dnl            AC_CHECK_LIB(db,dbopen)
-dnl
-AC_DEFUN([OL_LIB_BERKELEY_DB],
-[AC_CACHE_CHECK([for Berkeley DB library], [ol_cv_lib_db],
-[
-       AC_CHECK_HEADERS(db1/db.h)
-       ol_LIBS="$LIBS"
-       AC_CHECK_FUNC(dbopen,[ol_cv_lib_db=yes], [
-               AC_CHECK_LIB(db1,dbopen,[ol_cv_lib_db=-ldb1],[
-                       AC_CHECK_LIB(db,dbopen,[ol_cv_lib_db=-ldb],
-                       [ol_cv_lib_db=no])
-               ])
-       ])
-       LIBS="$ol_LIBS"
+dnl Find any DB
+AC_DEFUN([OL_BERKELEY_DB],
+[ol_cv_berkeley_db=no
+AC_CHECK_HEADERS(db.h)
+if test $ac_cv_header_db_h = yes; then
+       OL_BERKELEY_DB_LINK
+       if test "$ol_cv_lib_db" != no ; then
+               ol_cv_berkeley_db=yes
+               OL_BERKELEY_DB_THREAD
+       fi
+fi
 ])
-])dnl
 dnl
 dnl --------------------------------------------------------------------
-dnl Check if Berkeley DB exists
-dnl
-dnl defines ol_cv_berkeley_db to 'yes' or 'no'
-dnl 
-dnl uses:
-dnl            OL_LIB_BERKELEY_DB
-dnl            OL_HEADER_BERKELEY_DB
-dnl
-AC_DEFUN([OL_BERKELEY_DB],
-[AC_REQUIRE([OL_LIB_BERKELEY_DB])
- AC_REQUIRE([OL_HEADER_BERKELEY_DB])
- AC_CACHE_CHECK([for Berkeley DB], [ol_cv_berkeley_db], [
-       if test "$ol_cv_lib_db" = no -o "$ol_cv_header_db" = no ; then
-               ol_cv_berkeley_db=no
-       else
-               ol_cv_berkeley_db=yes
+dnl Find old Berkeley DB 1.85/1.86
+AC_DEFUN([OL_BERKELEY_COMPAT_DB],
+[ol_cv_berkeley_db=no
+AC_CHECK_HEADERS(db_185.h db.h)
+if test $ac_cv_header_db_185_h = yes -o $ac_cv_header_db_h = yes; then
+       AC_CACHE_CHECK([if Berkeley DB header compatibility], [ol_cv_header_db1],[
+               AC_EGREP_CPP(__db_version_1,[
+#if HAVE_DB_185_H
+#      include <db_185.h>
+#else
+#      include <db.h>
+#endif
+
+ /* this check could be improved */
+#ifndef DB_VERSION_MAJOR
+#      define DB_VERSION_MAJOR 1
+#endif
+
+#if DB_VERSION_MAJOR == 1 
+       __db_version_1
+#endif
+],     [ol_cv_header_db1=yes], [ol_cv_header_db1=no])])
+
+       if test ol_cv_header_db1=yes ; then
+               OL_BERKELEY_DB_LINK
+               if test "$ol_cv_lib_db" != no ; then
+                       ol_cv_berkeley_db=yes
+               fi
        fi
+fi
 ])
- if test $ol_cv_berkeley_db = yes ; then
-       AC_DEFINE(HAVE_BERKELEY_DB,1, [define if Berkeley DB is available])
- fi
-])dnl
 dnl
 dnl ====================================================================
 dnl Check if GDBM library exists
@@ -589,14 +599,26 @@ AC_DEFUN([OL_PTHREAD_TEST_FUNCTION],[
        /* pthread test function */
        pthread_t t;
        int status;
+#if HAVE_PTHREADS_FINAL && defined(PTHREAD_CREATE_UNDETACHED)
+       /* This system (e.g. AIX) defaults detached; must override */
+       pthread_attr_t attr;
 
-       /* make sure pthread_create() isn't just a stub */
+       status = pthread_attr_init(&attr);
+       if( status ) exit( status );
+
+       status = pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_UNDETACHED);
+       if( status ) exit( status );
+
+#define        ATTR    &attr
+#else
 #if HAVE_PTHREADS_D4
-       status = pthread_create(&t, pthread_attr_default, task, NULL);
+#define        ATTR    pthread_attr_default
 #else
-       status = pthread_create(&t, NULL, task, NULL);
+#define        ATTR    NULL
 #endif
-
+#endif
+       /* make sure pthread_create() isn't just a stub */
+       status = pthread_create(&t, ATTR, task, NULL);
        if( status ) exit( status );
 
        /* make sure pthread_detach() isn't just a stub */
@@ -670,6 +692,19 @@ AC_DEFUN([OL_HEADER_GNU_PTH_PTHREAD_H], [
                ])
 ])dnl
 dnl ====================================================================
+dnl Check for NT Threads
+AC_DEFUN([OL_NT_THREADS], [
+       AC_CACHE_CHECK([for NT Threads], [ol_cv_nt_threads], [
+               AC_CHECK_FUNC(_beginthread,
+                       [ol_cv_nt_threads=yes],
+                       [ol_cv_nt_threads=no])
+       ])
+
+       if test $ol_cv_nt_threads = yes ; then
+               AC_DEFINE(HAVE_NT_THREADS,1,[if you have NT Threads])
+       fi
+])
+dnl ====================================================================
 dnl Check LinuxThreads Header
 dnl
 dnl defines ol_cv_header linux_threads to 'yes' or 'no'
@@ -696,7 +731,7 @@ dnl defines ol_cv_sys_linux_threads to 'yes' or 'no'
 dnl    'no' implies pthreads implementation is not LinuxThreads.
 dnl 
 AC_DEFUN([OL_SYS_LINUX_THREADS], [
-       AC_CHECK_FUNC(pthread_kill_other_threads_np)
+       AC_CHECK_FUNCS(pthread_kill_other_threads_np)
        AC_CACHE_CHECK([for LinuxThreads implementation],
                [ol_cv_sys_linux_threads],
                [ol_cv_sys_linux_threads=$ac_cv_func_pthread_kill_other_threads_np])
@@ -782,7 +817,10 @@ AC_DEFUN([OL_SYS_ERRLIST],
        AC_TRY_COMPILE([
 #include <stdio.h>
 #include <sys/types.h>
-#include <errno.h> ],
+#include <errno.h>
+#ifdef WINNT
+#include <stdlib.h>
+#endif ],
        [char *c = (char *) *sys_errlist],
        [ol_cv_dcl_sys_errlist=yes
        ol_cv_have_sys_errlist=yes],
@@ -825,7 +863,7 @@ dnl
 dnl ====================================================================
 dnl Look for fetch(3)
 AC_DEFUN([OL_LIB_FETCH],
-[ol=$LIBS
+[ol_LIBS=$LIBS
 LIBS="-lfetch -lcom_err $LIBS"
 AC_CACHE_CHECK([fetch(3) library],ol_cv_lib_fetch,[
        AC_TRY_LINK([
@@ -907,13 +945,31 @@ AC_DEFUN(OL_FUNC_CTIME_R_NARGS,
  [AC_CACHE_CHECK(number of arguments of ctime_r, ol_cv_func_ctime_r_nargs,
    [AC_TRY_COMPILE([#include <time.h>],
                [time_t ti; char *buffer; ctime_r(&ti,buffer,32);],
-                       ol_cv_func_ctime_r_nargs=3,
-                       [AC_TRY_COMPILE([#include <time.h>],
-                               [time_t ti; char *buffer; ctime_r(&ti,buffer);],
-                                       ol_cv_func_ctime_r_nargs=2,
-                                       ol_cv_func_ctime_r_nargs=0)])])
+                       ol_cv_func_ctime_r_nargs3=yes,
+                       ol_cv_func_ctime_r_nargs3=no)
+
+       AC_TRY_COMPILE([#include <time.h>],
+               [time_t ti; char *buffer; ctime_r(&ti,buffer);],
+                       ol_cv_func_ctime_r_nargs2=yes,
+                       ol_cv_func_ctime_r_nargs2=no)
+
+       if test $ol_cv_func_ctime_r_nargs3 = yes -a \
+               $ol_cv_func_ctime_r_nargs2 = no ; then
+
+               ol_cv_func_ctime_r_nargs=3
+
+       elif test $ol_cv_func_ctime_r_nargs3 = no -a \
+               $ol_cv_func_ctime_r_nargs2 = yes ; then
+
+               ol_cv_func_ctime_r_nargs=2
+
+       else
+               ol_cv_func_ctime_r_nargs=0
+       fi
+  ])
+
   if test $ol_cv_func_ctime_r_nargs -gt 1 ; then
-    AC_DEFINE_UNQUOTED(CTIME_R_NARGS, $ol_cv_func_ctime_r_nargs,
+       AC_DEFINE_UNQUOTED(CTIME_R_NARGS, $ol_cv_func_ctime_r_nargs,
                [set to the number of arguments ctime_r() expects])
   fi
 ])dnl
@@ -944,19 +1000,36 @@ AC_DEFUN(OL_FUNC_GETHOSTBYNAME_R_NARGS,
                int bufsize=BUFSIZE;int h_errno;
                (void)gethostbyname_r("segovia.cs.purdue.edu", &hent,
                        buffer, bufsize, &h_errno);],
-               ol_cv_func_gethostbyname_r_nargs=5, 
-               [AC_TRY_COMPILE([#include <sys/types.h>
+               ol_cv_func_gethostbyname_r_nargs5=yes, 
+               ol_cv_func_gethostbyname_r_nargs5=no)
+
+       AC_TRY_COMPILE([#include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <netdb.h>
 #define BUFSIZE (sizeof(struct hostent)+10)],
-                       [struct hostent hent;struct hostent *rhent;
-                       char buffer[BUFSIZE];
-                       int bufsize=BUFSIZE;int h_errno;
-                       (void)gethostbyname_r("localhost", &hent, buffer, bufsize,
-                               &rhent, &h_errno);],
-                       ol_cv_func_gethostbyname_r_nargs=6,
-                       ol_cv_func_gethostbyname_r_nargs=0)])])
+               [struct hostent hent;struct hostent *rhent;
+               char buffer[BUFSIZE];
+               int bufsize=BUFSIZE;int h_errno;
+               (void)gethostbyname_r("localhost", &hent, buffer, bufsize,
+                       &rhent, &h_errno);],
+               ol_cv_func_gethostbyname_r_nargs6=yes,
+               ol_cv_func_gethostbyname_r_nargs6=no)
+
+       if test $ol_cv_func_gethostbyname_r_nargs5 = yes -a \
+               $ol_cv_func_gethostbyname_r_nargs6 = no ; then
+
+               ol_cv_func_gethostbyname_r_nargs=5
+
+       elif test $ol_cv_func_gethostbyname_r_nargs5 = no -a \
+               $ol_cv_func_gethostbyname_r_nargs6 = yes ; then
+
+               ol_cv_func_gethostbyname_r_nargs=6
+
+       else
+               ol_cv_func_gethostbyname_r_nargs=0
+       fi
+  ])
   if test $ol_cv_func_gethostbyname_r_nargs -gt 1 ; then
        AC_DEFINE_UNQUOTED(GETHOSTBYNAME_R_NARGS,
                $ol_cv_func_gethostbyname_r_nargs,
@@ -979,22 +1052,39 @@ AC_DEFUN(OL_FUNC_GETHOSTBYADDR_R_NARGS,
            int bufsize=BUFSIZE;int h_errno;
                (void)gethostbyaddr_r( (void *)&(add.s_addr),
                        alen, AF_INET, &hent, buffer, bufsize, &h_errno);],
-               ol_cv_func_gethostbyaddr_r_nargs=7,
-               [AC_TRY_COMPILE([#include <sys/types.h>
+               ol_cv_func_gethostbyaddr_r_nargs7=yes,
+               ol_cv_func_gethostbyaddr_r_nargs7=no)
+
+       AC_TRY_COMPILE([#include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <netdb.h>
 #define BUFSIZE (sizeof(struct hostent)+10)],
-                       [struct hostent hent;
-                       struct hostent *rhent; char buffer[BUFSIZE]; 
-                       struct in_addr add;
-                       size_t alen=sizeof(struct in_addr);
-                       int bufsize=BUFSIZE;int h_errno;
-                       (void)gethostbyaddr_r( (void *)&(add.s_addr),
-                               alen, AF_INET, &hent, buffer, bufsize, 
-                               &rhent, &h_errno);],
-                       ol_cv_func_gethostbyaddr_r_nargs=8,
-                       ol_cv_func_gethostbyaddr_r_nargs=0)])])
+               [struct hostent hent;
+               struct hostent *rhent; char buffer[BUFSIZE]; 
+               struct in_addr add;
+               size_t alen=sizeof(struct in_addr);
+               int bufsize=BUFSIZE;int h_errno;
+               (void)gethostbyaddr_r( (void *)&(add.s_addr),
+                       alen, AF_INET, &hent, buffer, bufsize, 
+                       &rhent, &h_errno);],
+               ol_cv_func_gethostbyaddr_r_nargs8=yes,
+               ol_cv_func_gethostbyaddr_r_nargs8=no)
+
+       if test $ol_cv_func_gethostbyaddr_r_nargs7 = yes -a \
+               $ol_cv_func_gethostbyaddr_r_nargs8 = no ; then
+
+               ol_cv_func_gethostbyaddr_r_nargs=7
+
+       elif test $ol_cv_func_gethostbyaddr_r_nargs7 = no -a \
+               $ol_cv_func_gethostbyaddr_r_nargs8 = yes ; then
+
+               ol_cv_func_gethostbyaddr_r_nargs=8
+
+       else
+               ol_cv_func_gethostbyaddr_r_nargs=0
+       fi
+  ])
   if test $ol_cv_func_gethostbyaddr_r_nargs -gt 1 ; then
     AC_DEFINE_UNQUOTED(GETHOSTBYADDR_R_NARGS,
                $ol_cv_func_gethostbyaddr_r_nargs,