configure.in: Check for struct hostent_data and need for -D_REENTRANT for gethostbyname_r...

1999-07-31  Alexandre Oliva  <oliva@dcc.unicamp.br>

	* configure.in: Check for struct hostent_data and need for
	-D_REENTRANT for gethostbyname_r declaration.
	* java/net/natInetAddress.cc: Define _REENTRANT if needed.
	(lookup): Use hostent_data for fixed_buffer.
	* configure, include/config.h.in: Rebuilt.

From-SVN: r28369

5 files changed, 268 insertions, 84 deletions

diff --git a/libjava/ChangeLog b/libjava/ChangeLog
index c6e8f03..351fa4e 100644
--- a/libjava/ChangeLog
+++ b/libjava/ChangeLog
@@ -1,5 +1,13 @@
 1999-07-31  Alexandre Oliva  <oliva@dcc.unicamp.br>
 
+	* configure.in: Check for struct hostent_data and need for
+	-D_REENTRANT for gethostbyname_r declaration.
+	* java/net/natInetAddress.cc: Define _REENTRANT if needed.
+	(lookup): Use hostent_data for fixed_buffer.
+	* configure, include/config.h.in: Rebuilt.
+
+1999-07-31  Alexandre Oliva  <oliva@dcc.unicamp.br>
+
 	* java/lang/natSystem.cc (arraycopy): Use bcopy if memmove is not
 	available.  Don't cast memmove args to (void*).
 	* configure.in: Do not abort if memmove is not available.
diff --git a/libjava/configure b/libjava/configure
index 93e7266..e0af1c8 100755
--- a/libjava/configure
+++ b/libjava/configure
@@ -3477,6 +3477,119 @@ EOF
 fi
 rm -f conftest*
 
+
+     case " $GCINCS " in
+     *" -D_REENTRANT "*) ;;
+     *)
+		echo $ac_n "checking whether gethostbyname_r declaration requires -D_REENTRANT""... $ac_c" 1>&6
+echo "configure:3486: checking whether gethostbyname_r declaration requires -D_REENTRANT" >&5
+if eval "test \"`echo '$''{'libjava_cv_gethostbyname_r_needs_reentrant'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+   
+	  ac_ext=C
+# CXXFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='${CXX-g++} -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext 1>&5'
+ac_link='${CXX-g++} -o conftest${ac_exeext} $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5'
+cross_compiling=$ac_cv_prog_cxx_cross
+
+	  cat > conftest.$ac_ext <<EOF
+#line 3499 "configure"
+#include "confdefs.h"
+#include <netdb.h>
+int main() {
+gethostbyname_r("", 0, 0);
+; return 0; }
+EOF
+if { (eval echo configure:3506: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  libjava_cv_gethostbyname_r_needs_reentrant=no
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  		CPPFLAGS_SAVE="$CPPFLAGS"
+		CPPFLAGS="$CPPFLAGS -D_REENTRANT"
+		cat > conftest.$ac_ext <<EOF
+#line 3516 "configure"
+#include "confdefs.h"
+#include <netdb.h>
+int main() {
+gethostbyname_r("", 0, 0);
+; return 0; }
+EOF
+if { (eval echo configure:3523: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  libjava_cv_gethostbyname_r_needs_reentrant=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  libjava_cv_gethostbyname_r_needs_reentrant=fail
+fi
+rm -f conftest*
+		CPPFLAGS="$CPPFLAGS_SAVE"
+	  
+fi
+rm -f conftest*
+	  ac_ext=c
+# CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='${CC-cc} -c $CFLAGS $CPPFLAGS conftest.$ac_ext 1>&5'
+ac_link='${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5'
+cross_compiling=$ac_cv_prog_cc_cross
+
+	
+fi
+
+echo "$ac_t""$libjava_cv_gethostbyname_r_needs_reentrant" 1>&6
+	if test "x$libjava_cv_gethostbyname_r_needs_reentrant" = xyes; then
+	  cat >> confdefs.h <<\EOF
+#define GETHOSTBYNAME_R_NEEDS_REENTRANT 1
+EOF
+
+	fi
+     ;;
+     esac
+
+     echo $ac_n "checking for struct hostent_data""... $ac_c" 1>&6
+echo "configure:3558: checking for struct hostent_data" >&5
+if eval "test \"`echo '$''{'libjava_cv_struct_hostent_data'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  	cat > conftest.$ac_ext <<EOF
+#line 3563 "configure"
+#include "confdefs.h"
+
+#if GETHOSTBYNAME_R_NEEDS_REENTRANT && !defined(_REENTRANT)
+# define _REENTRANT 1
+#endif
+#include <netdb.h>
+int main() {
+struct hostent_data data;
+; return 0; }
+EOF
+if { (eval echo configure:3574: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  libjava_cv_struct_hostent_data=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  libjava_cv_struct_hostent_data=no
+fi
+rm -f conftest*
+fi
+
+echo "$ac_t""$libjava_cv_struct_hostent_data" 1>&6
+     if test "x$libjava_cv_struct_hostent_data" = xyes; then
+       cat >> confdefs.h <<\EOF
+#define HAVE_STRUCT_HOSTENT_DATA 1
+EOF
+
+     fi
+   
 else
   echo "$ac_t""no" 1>&6
 fi
@@ -3486,12 +3599,12 @@ done
    for ac_func in gethostbyaddr_r
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3490: checking for $ac_func" >&5
+echo "configure:3603: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3495 "configure"
+#line 3608 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3514,7 +3627,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3518: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3631: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3541,7 +3654,7 @@ EOF
      # We look for the one that returns `int'.
      # Hopefully this check is robust enough.
      cat > conftest.$ac_ext <<EOF
-#line 3545 "configure"
+#line 3658 "configure"
 #include "confdefs.h"
 #include <netdb.h>
 EOF
@@ -3565,12 +3678,12 @@ done
    for ac_func in gethostname
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3569: checking for $ac_func" >&5
+echo "configure:3682: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3574 "configure"
+#line 3687 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3593,7 +3706,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3597: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3710: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3617,7 +3730,7 @@ EOF
 EOF
 
      cat > conftest.$ac_ext <<EOF
-#line 3621 "configure"
+#line 3734 "configure"
 #include "confdefs.h"
 #include <unistd.h>
 EOF
@@ -3644,12 +3757,12 @@ done
    for ac_func in pthread_mutexattr_settype pthread_mutexattr_setkind_np sched_yield
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3648: checking for $ac_func" >&5
+echo "configure:3761: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3653 "configure"
+#line 3766 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3672,7 +3785,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3676: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3789: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3700,12 +3813,12 @@ done
    for ac_func in sched_yield
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3704: checking for $ac_func" >&5
+echo "configure:3817: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3709 "configure"
+#line 3822 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3728,7 +3841,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3732: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3845: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3750,7 +3863,7 @@ EOF
 else
   echo "$ac_t""no" 1>&6
 echo $ac_n "checking for sched_yield in -lposix4""... $ac_c" 1>&6
-echo "configure:3754: checking for sched_yield in -lposix4" >&5
+echo "configure:3867: checking for sched_yield in -lposix4" >&5
 ac_lib_var=`echo posix4'_'sched_yield | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -3758,7 +3871,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lposix4  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 3762 "configure"
+#line 3875 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -3769,7 +3882,7 @@ int main() {
 sched_yield()
 ; return 0; }
 EOF
-if { (eval echo configure:3773: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3886: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -3804,12 +3917,12 @@ done
    for ac_func in gettimeofday time ftime
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3808: checking for $ac_func" >&5
+echo "configure:3921: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3813 "configure"
+#line 3926 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3832,7 +3945,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3836: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:3949: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3863,12 +3976,12 @@ done
    for ac_func in memmove
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3867: checking for $ac_func" >&5
+echo "configure:3980: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3872 "configure"
+#line 3985 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3891,7 +4004,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3895: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4008: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3921,12 +4034,12 @@ done
    for ac_func in memcpy
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:3925: checking for $ac_func" >&5
+echo "configure:4038: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3930 "configure"
+#line 4043 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -3949,7 +4062,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:3953: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4066: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -3997,7 +4110,7 @@ done
    #--------------------------------------------------------------------
 
    echo $ac_n "checking for socket libraries""... $ac_c" 1>&6
-echo "configure:4001: checking for socket libraries" >&5
+echo "configure:4114: checking for socket libraries" >&5
 if eval "test \"`echo '$''{'gcj_cv_lib_sockets'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4005,12 +4118,12 @@ else
      gcj_checkBoth=0
      unset ac_cv_func_connect
      echo $ac_n "checking for connect""... $ac_c" 1>&6
-echo "configure:4009: checking for connect" >&5
+echo "configure:4122: checking for connect" >&5
 if eval "test \"`echo '$''{'ac_cv_func_connect'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4014 "configure"
+#line 4127 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char connect(); below.  */
@@ -4033,7 +4146,7 @@ connect();
 
 ; return 0; }
 EOF
-if { (eval echo configure:4037: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4150: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_connect=yes"
 else
@@ -4056,7 +4169,7 @@ fi
      if test "$gcj_checkSocket" = 1; then
 	 unset ac_cv_func_connect
 	 echo $ac_n "checking for main in -lsocket""... $ac_c" 1>&6
-echo "configure:4060: checking for main in -lsocket" >&5
+echo "configure:4173: checking for main in -lsocket" >&5
 ac_lib_var=`echo socket'_'main | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4064,14 +4177,14 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lsocket  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4068 "configure"
+#line 4181 "configure"
 #include "confdefs.h"
 
 int main() {
 main()
 ; return 0; }
 EOF
-if { (eval echo configure:4075: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4188: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4098,12 +4211,12 @@ fi
 	 LIBS="$LIBS -lsocket -lnsl"
 	 unset ac_cv_func_accept
 	 echo $ac_n "checking for accept""... $ac_c" 1>&6
-echo "configure:4102: checking for accept" >&5
+echo "configure:4215: checking for accept" >&5
 if eval "test \"`echo '$''{'ac_cv_func_accept'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4107 "configure"
+#line 4220 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char accept(); below.  */
@@ -4126,7 +4239,7 @@ accept();
 
 ; return 0; }
 EOF
-if { (eval echo configure:4130: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4243: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_accept=yes"
 else
@@ -4153,12 +4266,12 @@ fi
      gcj_oldLibs=$LIBS
      LIBS="$LIBS $gcj_cv_lib_sockets"
      echo $ac_n "checking for gethostbyname""... $ac_c" 1>&6
-echo "configure:4157: checking for gethostbyname" >&5
+echo "configure:4270: checking for gethostbyname" >&5
 if eval "test \"`echo '$''{'ac_cv_func_gethostbyname'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4162 "configure"
+#line 4275 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char gethostbyname(); below.  */
@@ -4181,7 +4294,7 @@ gethostbyname();
 
 ; return 0; }
 EOF
-if { (eval echo configure:4185: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4298: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_gethostbyname=yes"
 else
@@ -4199,7 +4312,7 @@ if eval "test \"`echo '$ac_cv_func_'gethostbyname`\" = yes"; then
 else
   echo "$ac_t""no" 1>&6
 echo $ac_n "checking for main in -lnsl""... $ac_c" 1>&6
-echo "configure:4203: checking for main in -lnsl" >&5
+echo "configure:4316: checking for main in -lnsl" >&5
 ac_lib_var=`echo nsl'_'main | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4207,14 +4320,14 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lnsl  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4211 "configure"
+#line 4324 "configure"
 #include "confdefs.h"
 
 int main() {
 main()
 ; return 0; }
 EOF
-if { (eval echo configure:4218: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4331: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4246,7 +4359,7 @@ echo "$ac_t""$gcj_cv_lib_sockets" 1>&6
 
    if test "$with_system_zlib" = yes; then
       echo $ac_n "checking for deflate in -lz""... $ac_c" 1>&6
-echo "configure:4250: checking for deflate in -lz" >&5
+echo "configure:4363: checking for deflate in -lz" >&5
 ac_lib_var=`echo z'_'deflate | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4254,7 +4367,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lz  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4258 "configure"
+#line 4371 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -4265,7 +4378,7 @@ int main() {
 deflate()
 ; return 0; }
 EOF
-if { (eval echo configure:4269: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4382: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4294,7 +4407,7 @@ fi
    # requires -ldl.
    if test "$GC" = boehm; then
       echo $ac_n "checking for main in -ldl""... $ac_c" 1>&6
-echo "configure:4298: checking for main in -ldl" >&5
+echo "configure:4411: checking for main in -ldl" >&5
 ac_lib_var=`echo dl'_'main | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4302,14 +4415,14 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-ldl  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4306 "configure"
+#line 4419 "configure"
 #include "confdefs.h"
 
 int main() {
 main()
 ; return 0; }
 EOF
-if { (eval echo configure:4313: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4426: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -4418,17 +4531,17 @@ for ac_hdr in unistd.h sys/time.h sys/types.h fcntl.h sys/ioctl.h sys/filio.h sy
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
-echo "configure:4422: checking for $ac_hdr" >&5
+echo "configure:4535: checking for $ac_hdr" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4427 "configure"
+#line 4540 "configure"
 #include "confdefs.h"
 #include <$ac_hdr>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:4432: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:4545: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -4458,17 +4571,17 @@ for ac_hdr in dirent.h
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
-echo "configure:4462: checking for $ac_hdr" >&5
+echo "configure:4575: checking for $ac_hdr" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4467 "configure"
+#line 4580 "configure"
 #include "confdefs.h"
 #include <$ac_hdr>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:4472: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:4585: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -4496,16 +4609,16 @@ done
 
 
 echo $ac_n "checking whether struct sockaddr_in6 is in netinet/in.h""... $ac_c" 1>&6
-echo "configure:4500: checking whether struct sockaddr_in6 is in netinet/in.h" >&5
+echo "configure:4613: checking whether struct sockaddr_in6 is in netinet/in.h" >&5
 cat > conftest.$ac_ext <<EOF
-#line 4502 "configure"
+#line 4615 "configure"
 #include "confdefs.h"
 #include <netinet/in.h>
 int main() {
 struct sockaddr_in6 addr6;
 ; return 0; }
 EOF
-if { (eval echo configure:4509: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:4622: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_INET6 1
@@ -4521,16 +4634,16 @@ fi
 rm -f conftest*
 
 echo $ac_n "checking for socklen_t in sys/socket.h""... $ac_c" 1>&6
-echo "configure:4525: checking for socklen_t in sys/socket.h" >&5
+echo "configure:4638: checking for socklen_t in sys/socket.h" >&5
 cat > conftest.$ac_ext <<EOF
-#line 4527 "configure"
+#line 4640 "configure"
 #include "confdefs.h"
 #include <sys/socket.h>
 int main() {
 socklen_t x = 5;
 ; return 0; }
 EOF
-if { (eval echo configure:4534: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:4647: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_SOCKLEN_T 1
@@ -4546,16 +4659,16 @@ fi
 rm -f conftest*
 
 echo $ac_n "checking for tm_gmtoff in struct tm""... $ac_c" 1>&6
-echo "configure:4550: checking for tm_gmtoff in struct tm" >&5
+echo "configure:4663: checking for tm_gmtoff in struct tm" >&5
 cat > conftest.$ac_ext <<EOF
-#line 4552 "configure"
+#line 4665 "configure"
 #include "confdefs.h"
 #include <time.h>
 int main() {
 struct tm tim; tim.tm_gmtoff = 0;
 ; return 0; }
 EOF
-if { (eval echo configure:4559: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:4672: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define STRUCT_TM_HAS_GMTOFF 1
@@ -4568,16 +4681,16 @@ else
   rm -rf conftest*
   echo "$ac_t""no" 1>&6
    echo $ac_n "checking for global timezone variable""... $ac_c" 1>&6
-echo "configure:4572: checking for global timezone variable" >&5
+echo "configure:4685: checking for global timezone variable" >&5
             cat > conftest.$ac_ext <<EOF
-#line 4574 "configure"
+#line 4687 "configure"
 #include "confdefs.h"
 #include <time.h>
 int main() {
 long z2 = timezone;
 ; return 0; }
 EOF
-if { (eval echo configure:4581: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:4694: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   cat >> confdefs.h <<\EOF
 #define HAVE_TIMEZONE 1
@@ -4597,19 +4710,19 @@ rm -f conftest*
 # The Ultrix 4.2 mips builtin alloca declared by alloca.h only works
 # for constant arguments.  Useless!
 echo $ac_n "checking for working alloca.h""... $ac_c" 1>&6
-echo "configure:4601: checking for working alloca.h" >&5
+echo "configure:4714: checking for working alloca.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_alloca_h'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4606 "configure"
+#line 4719 "configure"
 #include "confdefs.h"
 #include <alloca.h>
 int main() {
 char *p = alloca(2 * sizeof(int));
 ; return 0; }
 EOF
-if { (eval echo configure:4613: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4726: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   ac_cv_header_alloca_h=yes
 else
@@ -4630,12 +4743,12 @@ EOF
 fi
 
 echo $ac_n "checking for alloca""... $ac_c" 1>&6
-echo "configure:4634: checking for alloca" >&5
+echo "configure:4747: checking for alloca" >&5
 if eval "test \"`echo '$''{'ac_cv_func_alloca_works'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4639 "configure"
+#line 4752 "configure"
 #include "confdefs.h"
 
 #ifdef __GNUC__
@@ -4663,7 +4776,7 @@ int main() {
 char *p = (char *) alloca(1);
 ; return 0; }
 EOF
-if { (eval echo configure:4667: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4780: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   ac_cv_func_alloca_works=yes
 else
@@ -4695,12 +4808,12 @@ EOF
 
 
 echo $ac_n "checking whether alloca needs Cray hooks""... $ac_c" 1>&6
-echo "configure:4699: checking whether alloca needs Cray hooks" >&5
+echo "configure:4812: checking whether alloca needs Cray hooks" >&5
 if eval "test \"`echo '$''{'ac_cv_os_cray'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4704 "configure"
+#line 4817 "configure"
 #include "confdefs.h"
 #if defined(CRAY) && ! defined(CRAY2)
 webecray
@@ -4725,12 +4838,12 @@ echo "$ac_t""$ac_cv_os_cray" 1>&6
 if test $ac_cv_os_cray = yes; then
 for ac_func in _getb67 GETB67 getb67; do
   echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:4729: checking for $ac_func" >&5
+echo "configure:4842: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4734 "configure"
+#line 4847 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -4753,7 +4866,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:4757: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4870: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -4780,7 +4893,7 @@ done
 fi
 
 echo $ac_n "checking stack direction for C alloca""... $ac_c" 1>&6
-echo "configure:4784: checking stack direction for C alloca" >&5
+echo "configure:4897: checking stack direction for C alloca" >&5
 if eval "test \"`echo '$''{'ac_cv_c_stack_direction'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4788,7 +4901,7 @@ else
   ac_cv_c_stack_direction=0
 else
   cat > conftest.$ac_ext <<EOF
-#line 4792 "configure"
+#line 4905 "configure"
 #include "confdefs.h"
 find_stack_direction ()
 {
@@ -4807,7 +4920,7 @@ main ()
   exit (find_stack_direction() < 0);
 }
 EOF
-if { (eval echo configure:4811: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:4924: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_c_stack_direction=1
 else
@@ -4834,7 +4947,7 @@ do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:4838: checking for $ac_word" >&5
+echo "configure:4951: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_PERL'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
diff --git a/libjava/configure.in b/libjava/configure.in
index 46cfa21..0d62de6 100644
--- a/libjava/configure.in
+++ b/libjava/configure.in
@@ -309,7 +309,48 @@ else
      # We look for the one that returns `int'.
      # Hopefully this check is robust enough.
      AC_EGREP_HEADER(int.*gethostbyname_r, netdb.h, [
-       AC_DEFINE(GETHOSTBYNAME_R_RETURNS_INT)])])
+       AC_DEFINE(GETHOSTBYNAME_R_RETURNS_INT)])
+
+     case " $GCINCS " in
+     *" -D_REENTRANT "*) ;;
+     *)
+	dnl On DU4.0, gethostbyname_r is only declared with -D_REENTRANT
+	AC_CACHE_CHECK([whether gethostbyname_r declaration requires -D_REENTRANT],
+	[libjava_cv_gethostbyname_r_needs_reentrant],
+	[ AC_LANG_SAVE
+	  AC_LANG_CPLUSPLUS
+	  AC_TRY_COMPILE([#include <netdb.h>],
+	    [gethostbyname_r("", 0, 0);],
+	    [libjava_cv_gethostbyname_r_needs_reentrant=no], [dnl
+		CPPFLAGS_SAVE="$CPPFLAGS"
+		CPPFLAGS="$CPPFLAGS -D_REENTRANT"
+		AC_TRY_COMPILE([#include <netdb.h>], [gethostbyname_r("", 0, 0);],
+		    [libjava_cv_gethostbyname_r_needs_reentrant=yes],
+		    [libjava_cv_gethostbyname_r_needs_reentrant=fail])
+		CPPFLAGS="$CPPFLAGS_SAVE"
+	  ])
+	  AC_LANG_RESTORE
+	])
+	if test "x$libjava_cv_gethostbyname_r_needs_reentrant" = xyes; then
+	  AC_DEFINE(GETHOSTBYNAME_R_NEEDS_REENTRANT, 1, [Define if gethostbyname_r is only declared if _REENTRANT is defined])
+	fi
+     ;;
+     esac
+
+     AC_CACHE_CHECK([for struct hostent_data],
+	[libjava_cv_struct_hostent_data], [dnl
+	AC_TRY_COMPILE([
+#if GETHOSTBYNAME_R_NEEDS_REENTRANT && !defined(_REENTRANT)
+# define _REENTRANT 1
+#endif
+#include <netdb.h>], [struct hostent_data data;],
+	  [libjava_cv_struct_hostent_data=yes],
+	  [libjava_cv_struct_hostent_data=no])])
+     if test "x$libjava_cv_struct_hostent_data" = xyes; then
+       AC_DEFINE(HAVE_STRUCT_HOSTENT_DATA, 1,
+         [Define if struct hostent_data is defined in netdb.h])
+     fi
+   ])
 
    AC_CHECK_FUNCS(gethostbyaddr_r, [
      AC_DEFINE(HAVE_GETHOSTBYADDR_R)
diff --git a/libjava/include/config.h.in b/libjava/include/config.h.in
index e6fbe5d..bd43c75 100644
--- a/libjava/include/config.h.in
+++ b/libjava/include/config.h.in
@@ -268,3 +268,9 @@
 /* Version number of package */
 #undef VERSION
 
+/* Define if gethostbyname_r is only declared if _REENTRANT is defined */
+#undef GETHOSTBYNAME_R_NEEDS_REENTRANT
+
+/* Define if struct hostent_data is defined in netdb.h */
+#undef HAVE_STRUCT_HOSTENT_DATA
+
diff --git a/libjava/java/net/natInetAddress.cc b/libjava/java/net/natInetAddress.cc
index feac469..b15590a 100644
--- a/libjava/java/net/natInetAddress.cc
+++ b/libjava/java/net/natInetAddress.cc
@@ -10,6 +10,10 @@ details.  */
 
 #include <config.h>
 
+#if GETHOSTBYNAME_R_NEEDS_REENTRANT && !defined(_REENTRANT)
+# define _REENTRANT 1
+#endif
+
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
@@ -97,6 +101,9 @@ java::net::InetAddress::lookup (jstring host, java::net::InetAddress* iaddr,
   struct hostent *hptr = NULL;
 #if defined (HAVE_GETHOSTBYNAME_R) || defined (HAVE_GETHOSTBYADDR_R)
   struct hostent hent_r;
+#if HAVE_STRUCT_HOSTENT_DATA
+  struct hostent_data fixed_buffer, *buffer_r = &fixed_buffer;
+#else
 #if defined (__GLIBC__) 
   // FIXME: in glibc, gethostbyname_r returns NETDB_INTERNAL to herr and
   // ERANGE to errno if the buffer size is too small, rather than what is 
@@ -109,6 +116,7 @@ java::net::InetAddress::lookup (jstring host, java::net::InetAddress* iaddr,
   char *buffer_r = fixed_buffer;
   int size_r = sizeof (fixed_buffer);
 #endif
+#endif
 
   if (host != NULL)
     {
@@ -122,10 +130,13 @@ java::net::InetAddress::lookup (jstring host, java::net::InetAddress* iaddr,
       JvGetStringUTFRegion (host, 0, host->length(), hostname);
       buf[len] = '\0';
 #ifdef HAVE_GETHOSTBYNAME_R
-      int herr = 0;
       while (true)
 	{
 	  int ok;
+#if HAVE_STRUCT_HOSTENT_DATA
+	  ok = ! gethostbyname_r (hostname, &hent_r, buffer_r);
+#else
+	  int herr = 0;
 #ifdef GETHOSTBYNAME_R_RETURNS_INT
 	  ok = ! gethostbyname_r (hostname, &hent_r, buffer_r, size_r,
 				  &hptr, &herr);
@@ -139,6 +150,7 @@ java::net::InetAddress::lookup (jstring host, java::net::InetAddress* iaddr,
 	      buffer_r = (char *) _Jv_AllocBytesChecked (size_r);
 	    }
 	  else
+#endif /* HAVE_STRUCT_HOSTENT_DATA */
 	    break;
 	}
 #else
@@ -171,10 +183,13 @@ java::net::InetAddress::lookup (jstring host, java::net::InetAddress* iaddr,
 	JvFail ("unrecognized size");
 
 #ifdef HAVE_GETHOSTBYADDR_R
-      int herr = 0;
       while (true)
 	{
 	  int ok;
+#if HAVE_STRUCT_HOSTENT_DATA
+	  ok = ! gethostbyaddr_r (val, len, type, &hent_r, buffer_r);
+#else
+	  int herr = 0;
 #ifdef GETHOSTBYADDR_R_RETURNS_INT
 	  ok = ! gethostbyaddr_r (val, len, type, &hent_r,
 				  buffer_r, size_r, &hptr, &herr);
@@ -189,6 +204,7 @@ java::net::InetAddress::lookup (jstring host, java::net::InetAddress* iaddr,
 	      buffer_r = (char *) _Jv_AllocBytesChecked (size_r);
 	    }
 	  else 
+#endif /* HAVE_STRUCT_HOSTENT_DATA */
 	    break;
 	}
 #else /* HAVE_GETHOSTBYADDR_R */