From e69f6c8c79513fb9f3c9a06ba34eadc54d93a616 Mon Sep 17 00:00:00 2001
From: DJ Delorie <dj@redhat.com>
Date: Fri, 13 Jun 2003 01:50:48 +0000
Subject: [PATCH] merge from gcc

---
 libiberty/ChangeLog    |   9 +++
 libiberty/config.in    |   6 +-
 libiberty/configure    | 136 ++++++++++++++++++++++++-----------------
 libiberty/configure.in |  14 ++++-
 libiberty/physmem.c    |   2 +-
 5 files changed, 105 insertions(+), 62 deletions(-)

diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index baa15cd688..75b6636129 100644
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,12 @@
+2003-06-09  Albert Chin-A-Young  <china@thewrittenword.com>
+	
+	PR bootstrap/10974
+	* physmem.c: Update comment.
+	* configure.in: Modify test for _system_configuration for older
+	AIX systems.
+
+	* config.in, configure: Regenerated.
+	
 2003-06-05  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
 
 	PR other/10810
diff --git a/libiberty/config.in b/libiberty/config.in
index 14ab3793c5..51d161a460 100644
--- a/libiberty/config.in
+++ b/libiberty/config.in
@@ -316,9 +316,6 @@
 /* Define if you have the sys_siglist variable. */
 #undef HAVE_SYS_SIGLIST
 
-/* Define if you have the _system_configuration variable. */
-#undef HAVE__SYSTEM_CONFIGURATION
-
 /* Define to one of _getb67, GETB67, getb67 for Cray-2 and Cray-YMP
    systems. This function is required for alloca.c support on those
    systems. */
@@ -331,6 +328,9 @@
         STACK_DIRECTION = 0 => direction of growth unknown */
 #undef STACK_DIRECTION
 
+/* Define if you have the _system_configuration variable. */
+#undef HAVE__SYSTEM_CONFIGURATION
+
 /* Define if canonicalize_file_name is not declared in system header files. */
 #undef NEED_DECLARATION_CANONICALIZE_FILE_NAME
 
diff --git a/libiberty/configure b/libiberty/configure
index d0899a2dcb..9182fc3f98 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -1875,7 +1875,7 @@ funcs="$funcs waitpid"
 
 # Also in the old function.def file: alloca, vfork, getopt.
 
-vars="sys_errlist sys_nerr sys_siglist _system_configuration"
+vars="sys_errlist sys_nerr sys_siglist"
 
 checkfuncs="getrusage on_exit psignal strerror strsignal sysconf times sbrk gettimeofday"
 checkfuncs="$checkfuncs realpath canonicalize_file_name pstat_getstatic pstat_getdynamic sysmp"
@@ -1957,10 +1957,6 @@ EOF
 
   cat >> confdefs.h <<\EOF
 #define HAVE_SYS_SIGLIST 1
-EOF
-
-  cat >> confdefs.h <<\EOF
-#define HAVE__SYSTEM_CONFIGURATION 1
 EOF
 
 fi
@@ -2157,7 +2153,7 @@ if test -z "${setobjs}"; then
   # We haven't set the list of objects yet.  Use the standard autoconf
   # tests.  This will only work if the compiler works.
   echo $ac_n "checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works""... $ac_c" 1>&6
-echo "configure:2161: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works" >&5
+echo "configure:2157: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works" >&5
 
 ac_ext=c
 # CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
@@ -2168,12 +2164,12 @@ cross_compiling=$ac_cv_prog_cc_cross
 
 cat > conftest.$ac_ext << EOF
 
-#line 2172 "configure"
+#line 2168 "configure"
 #include "confdefs.h"
 
 main(){return(0);}
 EOF
-if { (eval echo configure:2177: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2173: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   ac_cv_prog_cc_works=yes
   # If we can't run a trivial program, we are probably using a cross compiler.
   if (./conftest; exit) 2>/dev/null; then
@@ -2199,19 +2195,19 @@ if test $ac_cv_prog_cc_works = no; then
   { echo "configure: error: installation or configuration problem: C compiler cannot create executables." 1>&2; exit 1; }
 fi
 echo $ac_n "checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler""... $ac_c" 1>&6
-echo "configure:2203: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler" >&5
+echo "configure:2199: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler" >&5
 echo "$ac_t""$ac_cv_prog_cc_cross" 1>&6
 cross_compiling=$ac_cv_prog_cc_cross
 
   for ac_func in $funcs
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:2210: checking for $ac_func" >&5
+echo "configure:2206: 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 2215 "configure"
+#line 2211 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2234,7 +2230,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2238: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2234: \"$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
@@ -2261,12 +2257,12 @@ done
 
 
   echo $ac_n "checking whether alloca needs Cray hooks""... $ac_c" 1>&6
-echo "configure:2265: checking whether alloca needs Cray hooks" >&5
+echo "configure:2261: checking whether alloca needs Cray hooks" >&5
 if eval "test \"`echo '$''{'ac_cv_os_cray'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2270 "configure"
+#line 2266 "configure"
 #include "confdefs.h"
 #if defined(CRAY) && ! defined(CRAY2)
 webecray
@@ -2291,12 +2287,12 @@ 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:2295: checking for $ac_func" >&5
+echo "configure:2291: 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 2300 "configure"
+#line 2296 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2319,7 +2315,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2323: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2319: \"$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
@@ -2345,7 +2341,7 @@ fi
 fi
 
 echo $ac_n "checking stack direction for C alloca""... $ac_c" 1>&6
-echo "configure:2349: checking stack direction for C alloca" >&5
+echo "configure:2345: checking stack direction for C alloca" >&5
 if eval "test \"`echo '$''{'ac_cv_c_stack_direction'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2353,7 +2349,7 @@ else
   ac_cv_c_stack_direction=0
 else
   cat > conftest.$ac_ext <<EOF
-#line 2357 "configure"
+#line 2353 "configure"
 #include "confdefs.h"
 find_stack_direction ()
 {
@@ -2372,7 +2368,7 @@ main ()
   exit (find_stack_direction() < 0);
 }
 EOF
-if { (eval echo configure:2376: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2372: \"$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
@@ -2394,17 +2390,17 @@ EOF
 
   ac_safe=`echo "vfork.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for vfork.h""... $ac_c" 1>&6
-echo "configure:2398: checking for vfork.h" >&5
+echo "configure:2394: checking for vfork.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2403 "configure"
+#line 2399 "configure"
 #include "confdefs.h"
 #include <vfork.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:2408: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:2404: \"$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*
@@ -2429,18 +2425,18 @@ else
 fi
 
 echo $ac_n "checking for working vfork""... $ac_c" 1>&6
-echo "configure:2433: checking for working vfork" >&5
+echo "configure:2429: checking for working vfork" >&5
 if eval "test \"`echo '$''{'ac_cv_func_vfork_works'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   if test "$cross_compiling" = yes; then
   echo $ac_n "checking for vfork""... $ac_c" 1>&6
-echo "configure:2439: checking for vfork" >&5
+echo "configure:2435: checking for vfork" >&5
 if eval "test \"`echo '$''{'ac_cv_func_vfork'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2444 "configure"
+#line 2440 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char vfork(); below.  */
@@ -2463,7 +2459,7 @@ vfork();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2467: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2463: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_vfork=yes"
 else
@@ -2485,7 +2481,7 @@ fi
 ac_cv_func_vfork_works=$ac_cv_func_vfork
 else
   cat > conftest.$ac_ext <<EOF
-#line 2489 "configure"
+#line 2485 "configure"
 #include "confdefs.h"
 /* Thanks to Paul Eggert for this test.  */
 #include <stdio.h>
@@ -2580,7 +2576,7 @@ main() {
   }
 }
 EOF
-if { (eval echo configure:2584: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2580: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_func_vfork_works=yes
 else
@@ -2612,12 +2608,12 @@ fi
     for ac_func in _doprnt
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:2616: checking for $ac_func" >&5
+echo "configure:2612: 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 2621 "configure"
+#line 2617 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2640,7 +2636,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2644: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2640: \"$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
@@ -2670,12 +2666,12 @@ done
     for ac_func in _doprnt
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:2674: checking for $ac_func" >&5
+echo "configure:2670: 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 2679 "configure"
+#line 2675 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2698,7 +2694,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2702: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2698: \"$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
@@ -2726,19 +2722,19 @@ done
 
   for v in $vars; do
     echo $ac_n "checking for $v""... $ac_c" 1>&6
-echo "configure:2730: checking for $v" >&5
+echo "configure:2726: checking for $v" >&5
     if eval "test \"`echo '$''{'libiberty_cv_var_$v'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2735 "configure"
+#line 2731 "configure"
 #include "confdefs.h"
 int *p;
 int main() {
 extern int $v []; p = $v;
 ; return 0; }
 EOF
-if { (eval echo configure:2742: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2738: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "libiberty_cv_var_$v=yes"
 else
@@ -2761,15 +2757,43 @@ EOF
       echo "$ac_t""no" 1>&6
     fi
   done
+
+  # special check for _system_configuration because AIX <4.3.2 do not
+  # contain the `physmem' member.
+  echo $ac_n "checking for external symbol _system_configuration""... $ac_c" 1>&6
+echo "configure:2765: checking for external symbol _system_configuration" >&5
+  cat > conftest.$ac_ext <<EOF
+#line 2767 "configure"
+#include "confdefs.h"
+#include <sys/systemcfg.h>
+int main() {
+double x = _system_configuration.physmem;
+; return 0; }
+EOF
+if { (eval echo configure:2774: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  echo "$ac_t""yes" 1>&6
+    cat >> confdefs.h <<\EOF
+#define HAVE__SYSTEM_CONFIGURATION 1
+EOF
+
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  echo "$ac_t""no" 1>&6
+fi
+rm -f conftest*
+
   for ac_func in $checkfuncs
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:2768: checking for $ac_func" >&5
+echo "configure:2792: 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 2773 "configure"
+#line 2797 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2792,7 +2816,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2796: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2820: \"$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
@@ -2817,12 +2841,12 @@ fi
 done
 
   echo $ac_n "checking whether canonicalize_file_name must be declared""... $ac_c" 1>&6
-echo "configure:2821: checking whether canonicalize_file_name must be declared" >&5
+echo "configure:2845: checking whether canonicalize_file_name must be declared" >&5
 if eval "test \"`echo '$''{'libiberty_cv_decl_needed_canonicalize_file_name'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2826 "configure"
+#line 2850 "configure"
 #include "confdefs.h"
 
 #include "confdefs.h"
@@ -2844,7 +2868,7 @@ int main() {
 char *(*pfn) = (char *(*)) canonicalize_file_name
 ; return 0; }
 EOF
-if { (eval echo configure:2848: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2872: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   libiberty_cv_decl_needed_canonicalize_file_name=no
 else
@@ -2880,17 +2904,17 @@ for ac_hdr in unistd.h
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
-echo "configure:2884: checking for $ac_hdr" >&5
+echo "configure:2908: 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 2889 "configure"
+#line 2913 "configure"
 #include "confdefs.h"
 #include <$ac_hdr>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:2894: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:2918: \"$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*
@@ -2919,12 +2943,12 @@ done
 for ac_func in getpagesize
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:2923: checking for $ac_func" >&5
+echo "configure:2947: 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 2928 "configure"
+#line 2952 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2947,7 +2971,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2951: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2975: \"$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
@@ -2972,7 +2996,7 @@ fi
 done
 
 echo $ac_n "checking for working mmap""... $ac_c" 1>&6
-echo "configure:2976: checking for working mmap" >&5
+echo "configure:3000: checking for working mmap" >&5
 if eval "test \"`echo '$''{'ac_cv_func_mmap_fixed_mapped'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2980,7 +3004,7 @@ else
   ac_cv_func_mmap_fixed_mapped=no
 else
   cat > conftest.$ac_ext <<EOF
-#line 2984 "configure"
+#line 3008 "configure"
 #include "confdefs.h"
 
 /* Thanks to Mike Haertel and Jim Avera for this test.
@@ -3120,7 +3144,7 @@ main()
 }
 
 EOF
-if { (eval echo configure:3124: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:3148: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_func_mmap_fixed_mapped=yes
 else
@@ -3144,7 +3168,7 @@ fi
 
 
 echo $ac_n "checking for working strncmp""... $ac_c" 1>&6
-echo "configure:3148: checking for working strncmp" >&5
+echo "configure:3172: checking for working strncmp" >&5
 if eval "test \"`echo '$''{'ac_cv_func_strncmp_works'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3152,7 +3176,7 @@ else
   ac_cv_func_strncmp_works=no
 else
   cat > conftest.$ac_ext <<EOF
-#line 3156 "configure"
+#line 3180 "configure"
 #include "confdefs.h"
 
 /* Test by Jim Wilson and Kaveh Ghazi.
@@ -3216,7 +3240,7 @@ main ()
 }
 
 EOF
-if { (eval echo configure:3220: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:3244: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_func_strncmp_works=yes
 else
diff --git a/libiberty/configure.in b/libiberty/configure.in
index 4a704e8cec..0eab85513d 100644
--- a/libiberty/configure.in
+++ b/libiberty/configure.in
@@ -209,7 +209,7 @@ funcs="$funcs waitpid"
 
 # Also in the old function.def file: alloca, vfork, getopt.
 
-vars="sys_errlist sys_nerr sys_siglist _system_configuration"
+vars="sys_errlist sys_nerr sys_siglist"
 
 checkfuncs="getrusage on_exit psignal strerror strsignal sysconf times sbrk gettimeofday"
 checkfuncs="$checkfuncs realpath canonicalize_file_name pstat_getstatic pstat_getdynamic sysmp"
@@ -230,7 +230,6 @@ if test "x" = "y"; then
   AC_DEFINE(HAVE_SYS_ERRLIST, 1, [Define if you have the sys_errlist variable.])
   AC_DEFINE(HAVE_SYS_NERR,    1, [Define if you have the sys_nerr variable.])
   AC_DEFINE(HAVE_SYS_SIGLIST, 1, [Define if you have the sys_siglist variable.])
-  AC_DEFINE(HAVE__SYSTEM_CONFIGURATION, 1, [Define if you have the _system_configuration variable.])
 fi
 
 # For each of these functions, if the host does not provide the
@@ -433,6 +432,17 @@ if test -z "${setobjs}"; then
       AC_MSG_RESULT(no)
     fi
   done
+
+  # special check for _system_configuration because AIX <4.3.2 do not
+  # contain the `physmem' member.
+  AC_MSG_CHECKING([for external symbol _system_configuration])
+  AC_TRY_COMPILE([#include <sys/systemcfg.h>],
+                 [double x = _system_configuration.physmem;],
+    [AC_MSG_RESULT([yes])
+    AC_DEFINE(HAVE__SYSTEM_CONFIGURATION, 1,
+              [Define if you have the _system_configuration variable.])],
+    [AC_MSG_RESULT([no])])
+
   AC_CHECK_FUNCS($checkfuncs)
   libiberty_NEED_DECLARATION(canonicalize_file_name)
 fi
diff --git a/libiberty/physmem.c b/libiberty/physmem.c
index 9185c1224e..f64e07c74d 100644
--- a/libiberty/physmem.c
+++ b/libiberty/physmem.c
@@ -145,7 +145,7 @@ physmem_total ()
 #endif
 
 #if HAVE__SYSTEM_CONFIGURATION
-  /* This works on AIX.  */
+  /* This works on AIX 4.3.3+.  */
   return _system_configuration.physmem;
 #endif