* aclocal.m4 (AC_FUNC_MMAP_ZERO): New macro.

* configure.in (AC_FUNC_MMAP_ZERO): Use instead of AC_FUNC_MMAP.
* ggc-page.c: Replace HAVE_MMAP with HAVE_MMAP_ZERO.
* configure, config.in: Rebuilt.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@31444 138bc75d-0d04-0410-961f-82ee72b054a4

6 files changed, 501 insertions, 212 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 62c417c9022..de4e190b17b 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2000-01-16  Alexandre Oliva  <oliva@lsd.ic.unicamp.br>
+
+	* aclocal.m4 (AC_FUNC_MMAP_ZERO): New macro.
+	* configure.in (AC_FUNC_MMAP_ZERO): Use instead of AC_FUNC_MMAP.
+	* ggc-page.c: Replace HAVE_MMAP with HAVE_MMAP_ZERO.
+	* configure, config.in: Rebuilt.
+
 2000-01-16  Zack Weinberg  <zack@wolery.cumb.org>
 
 	* config/i386/i386.md: Add peephole to merge successive stack
diff --git a/gcc/aclocal.m4 b/gcc/aclocal.m4
index 300127f2931..d56b8f0847f 100644
--- a/gcc/aclocal.m4
+++ b/gcc/aclocal.m4
@@ -680,3 +680,85 @@ else
 fi
 AC_SUBST($1)dnl
 ])
+
+# Check whether mmap can map an arbitrary page from /dev/zero, without
+# MAP_FIXED.
+AC_DEFUN([AC_FUNC_MMAP_ANYWHERE],
+[AC_CHECK_HEADERS(unistd.h)
+AC_CHECK_FUNCS(getpagesize)
+AC_CACHE_CHECK(for working mmap from /dev/zero, ac_cv_func_mmap_zero,
+[AC_TRY_RUN([
+/* Test by Richard Henderson and Alexandre Oliva.
+   Check whether mmap from /dev/zero works. */
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+
+/* This mess was copied from the GNU getpagesize.h.  */
+#ifndef HAVE_GETPAGESIZE
+# ifdef HAVE_UNISTD_H
+#  include <unistd.h>
+# endif
+
+/* Assume that all systems that can run configure have sys/param.h.  */
+# ifndef HAVE_SYS_PARAM_H
+#  define HAVE_SYS_PARAM_H 1
+# endif
+
+# ifdef _SC_PAGESIZE
+#  define getpagesize() sysconf(_SC_PAGESIZE)
+# else /* no _SC_PAGESIZE */
+#  ifdef HAVE_SYS_PARAM_H
+#   include <sys/param.h>
+#   ifdef EXEC_PAGESIZE
+#    define getpagesize() EXEC_PAGESIZE
+#   else /* no EXEC_PAGESIZE */
+#    ifdef NBPG
+#     define getpagesize() NBPG * CLSIZE
+#     ifndef CLSIZE
+#      define CLSIZE 1
+#     endif /* no CLSIZE */
+#    else /* no NBPG */
+#     ifdef NBPC
+#      define getpagesize() NBPC
+#     else /* no NBPC */
+#      ifdef PAGESIZE
+#       define getpagesize() PAGESIZE
+#      endif /* PAGESIZE */
+#     endif /* no NBPC */
+#    endif /* no NBPG */
+#   endif /* no EXEC_PAGESIZE */
+#  else /* no HAVE_SYS_PARAM_H */
+#   define getpagesize() 8192	/* punt totally */
+#  endif /* no HAVE_SYS_PARAM_H */
+# endif /* no _SC_PAGESIZE */
+
+#endif /* no HAVE_GETPAGESIZE */
+
+int main()
+{
+  char *x;
+  int fd, pg;
+
+  fd = open("/dev/zero", O_RDWR);
+  if (fd < 0)
+    exit(1);
+
+  pg = getpagesize();
+  x = (char*)mmap(0, pg, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+  if (x == (char *) -1)
+    exit(2);
+
+  *(int *)x += 1;
+
+  if (munmap(x, pg) < 0)
+    exit(3);
+
+  exit(0);
+}], ac_cv_func_mmap_anywhere=yes, ac_cv_func_mmap_anywhere=no,
+ac_cv_func_mmap_anywhere=no)])
+if test $ac_cv_func_mmap_anywhere = yes; then
+  AC_DEFINE(HAVE_MMAP_ANYWHERE, 1,
+	    [Define if mmap can get us zeroed pages from /dev/zero.])
+fi
+])
diff --git a/gcc/config.in b/gcc/config.in
index d81d8e02f63..671ae67e3fe 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -415,3 +415,7 @@
 
 /* Define if you have the i library (-li).  */
 #undef HAVE_LIBI
+
+/* Define if mmap can get us zeroed pages from /dev/zero. */
+#undef HAVE_MMAP_ANYWHERE
+
diff --git a/gcc/configure b/gcc/configure
index 3bde3984707..def4bf8ef26 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -1383,7 +1383,7 @@ else
 fi
 
 # Find some useful tools
-for ac_prog in gawk mawk nawk awk
+for ac_prog in mawk gawk nawk awk
 do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
@@ -2805,39 +2805,20 @@ else
 fi
 done
 
-echo $ac_n "checking for working mmap""... $ac_c" 1>&6
-echo "configure:2810: checking for working mmap" >&5
-if eval "test \"`echo '$''{'ac_cv_func_mmap_fixed_mapped'+set}'`\" = set"; then
+echo $ac_n "checking for working mmap from /dev/zero""... $ac_c" 1>&6
+echo "configure:2810: checking for working mmap from /dev/zero" >&5
+if eval "test \"`echo '$''{'ac_cv_func_mmap_zero'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   if test "$cross_compiling" = yes; then
-  ac_cv_func_mmap_fixed_mapped=no
+  ac_cv_func_mmap_anywhere=no
 else
   cat > conftest.$ac_ext <<EOF
 #line 2818 "configure"
 #include "confdefs.h"
 
-/* Thanks to Mike Haertel and Jim Avera for this test.
-   Here is a matrix of mmap possibilities:
-	mmap private not fixed
-	mmap private fixed at somewhere currently unmapped
-	mmap private fixed at somewhere already mapped
-	mmap shared not fixed
-	mmap shared fixed at somewhere currently unmapped
-	mmap shared fixed at somewhere already mapped
-   For private mappings, we should verify that changes cannot be read()
-   back from the file, nor mmap's back from the file at a different
-   address.  (There have been systems where private was not correctly
-   implemented like the infamous i386 svr4.0, and systems where the
-   VM page cache was not coherent with the filesystem buffer cache
-   like early versions of FreeBSD and possibly contemporary NetBSD.)
-   For shared mappings, we should conversely verify that changes get
-   propogated back to all the places they're supposed to be.
-
-   Grep wants private fixed already mapped.
-   The main things grep needs to know about mmap are:
-   * does it exist and is it safe to write into the mmap'd area
-   * how to use it (BSD variants)  */
+/* Test by Richard Henderson and Alexandre Oliva.
+   Check whether mmap from /dev/zero works. */
 #include <sys/types.h>
 #include <fcntl.h>
 #include <sys/mman.h>
@@ -2883,95 +2864,46 @@ else
 
 #endif /* no HAVE_GETPAGESIZE */
 
-#ifdef __cplusplus
-extern "C" { void *malloc(unsigned); }
-#else
-char *malloc();
-#endif
-
-int
-main()
+int main()
 {
-	char *data, *data2, *data3;
-	int i, pagesize;
-	int fd;
+  char *x;
+  int fd, pg;
 
-	pagesize = getpagesize();
+  fd = open("/dev/zero", O_RDWR);
+  if (fd < 0)
+    exit(1);
 
-	/*
-	 * First, make a file with some known garbage in it.
-	 */
-	data = malloc(pagesize);
-	if (!data)
-		exit(1);
-	for (i = 0; i < pagesize; ++i)
-		*(data + i) = rand();
-	umask(0);
-	fd = creat("conftestmmap", 0600);
-	if (fd < 0)
-		exit(1);
-	if (write(fd, data, pagesize) != pagesize)
-		exit(1);
-	close(fd);
+  pg = getpagesize();
+  x = (char*)mmap(0, pg, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+  if (x == (char *) -1)
+    exit(2);
 
-	/*
-	 * Next, try to mmap the file at a fixed address which
-	 * already has something else allocated at it.  If we can,
-	 * also make sure that we see the same garbage.
-	 */
-	fd = open("conftestmmap", O_RDWR);
-	if (fd < 0)
-		exit(1);
-	data2 = malloc(2 * pagesize);
-	if (!data2)
-		exit(1);
-	data2 += (pagesize - ((int) data2 & (pagesize - 1))) & (pagesize - 1);
-	if (data2 != mmap(data2, pagesize, PROT_READ | PROT_WRITE,
-	    MAP_PRIVATE | MAP_FIXED, fd, 0L))
-		exit(1);
-	for (i = 0; i < pagesize; ++i)
-		if (*(data + i) != *(data2 + i))
-			exit(1);
+  *(int *)x += 1;
 
-	/*
-	 * Finally, make sure that changes to the mapped area
-	 * do not percolate back to the file as seen by read().
-	 * (This is a bug on some variants of i386 svr4.0.)
-	 */
-	for (i = 0; i < pagesize; ++i)
-		*(data2 + i) = *(data2 + i) + 1;
-	data3 = malloc(pagesize);
-	if (!data3)
-		exit(1);
-	if (read(fd, data3, pagesize) != pagesize)
-		exit(1);
-	for (i = 0; i < pagesize; ++i)
-		if (*(data + i) != *(data3 + i))
-			exit(1);
-	close(fd);
-	unlink("conftestmmap");
-	exit(0);
-}
+  if (munmap(x, pg) < 0)
+    exit(3);
 
+  exit(0);
+}
 EOF
-if { (eval echo configure:2958: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:2890: \"$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
+  ac_cv_func_mmap_anywhere=yes
 else
   echo "configure: failed program was:" >&5
   cat conftest.$ac_ext >&5
   rm -fr conftest*
-  ac_cv_func_mmap_fixed_mapped=no
+  ac_cv_func_mmap_anywhere=no
 fi
 rm -fr conftest*
 fi
 
 fi
 
-echo "$ac_t""$ac_cv_func_mmap_fixed_mapped" 1>&6
-if test $ac_cv_func_mmap_fixed_mapped = yes; then
+echo "$ac_t""$ac_cv_func_mmap_zero" 1>&6
+if test $ac_cv_func_mmap_anywhere = yes; then
   cat >> confdefs.h <<\EOF
-#define HAVE_MMAP 1
+#define HAVE_MMAP_ANYWHERE 1
 EOF
 
 fi
@@ -2982,12 +2914,12 @@ for ac_func in bcopy bzero bcmp \
 	strsignal putc_unlocked fputs_unlocked strstr environ
 do
 echo $ac_n "checking whether $ac_func must be declared""... $ac_c" 1>&6
-echo "configure:2986: checking whether $ac_func must be declared" >&5
+echo "configure:2918: checking whether $ac_func must be declared" >&5
 if eval "test \"`echo '$''{'gcc_cv_decl_needed_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2991 "configure"
+#line 2923 "configure"
 #include "confdefs.h"
 
 #include <stdio.h>
@@ -3024,7 +2956,7 @@ int main() {
 char *(*pfn) = (char *(*)) $ac_func
 ; return 0; }
 EOF
-if { (eval echo configure:3028: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2960: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   eval "gcc_cv_decl_needed_$ac_func=no"
 else
@@ -3053,12 +2985,12 @@ done
 for ac_func in malloc realloc calloc free
 do
 echo $ac_n "checking whether $ac_func must be declared""... $ac_c" 1>&6
-echo "configure:3057: checking whether $ac_func must be declared" >&5
+echo "configure:2989: checking whether $ac_func must be declared" >&5
 if eval "test \"`echo '$''{'gcc_cv_decl_needed_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3062 "configure"
+#line 2994 "configure"
 #include "confdefs.h"
 
 #include <stdio.h>
@@ -3098,7 +3030,7 @@ int main() {
 char *(*pfn) = (char *(*)) $ac_func
 ; return 0; }
 EOF
-if { (eval echo configure:3102: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3034: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   eval "gcc_cv_decl_needed_$ac_func=no"
 else
@@ -3127,12 +3059,12 @@ done
 for ac_func in getrlimit setrlimit getrusage
 do
 echo $ac_n "checking whether $ac_func must be declared""... $ac_c" 1>&6
-echo "configure:3131: checking whether $ac_func must be declared" >&5
+echo "configure:3063: checking whether $ac_func must be declared" >&5
 if eval "test \"`echo '$''{'gcc_cv_decl_needed_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3136 "configure"
+#line 3068 "configure"
 #include "confdefs.h"
 
 #include <stdio.h>
@@ -3173,7 +3105,7 @@ int main() {
 char *(*pfn) = (char *(*)) $ac_func
 ; return 0; }
 EOF
-if { (eval echo configure:3177: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3109: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   eval "gcc_cv_decl_needed_$ac_func=no"
 else
@@ -3201,12 +3133,12 @@ done
 
 # mkdir takes a single argument on some systems. 
 echo $ac_n "checking if mkdir takes one argument""... $ac_c" 1>&6
-echo "configure:3205: checking if mkdir takes one argument" >&5
+echo "configure:3137: checking if mkdir takes one argument" >&5
 if eval "test \"`echo '$''{'gcc_cv_mkdir_takes_one_arg'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 3210 "configure"
+#line 3142 "configure"
 #include "confdefs.h"
 
 #include <sys/types.h>
@@ -3223,7 +3155,7 @@ int main() {
 mkdir ("foo", 0);
 ; return 0; }
 EOF
-if { (eval echo configure:3227: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:3159: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   gcc_cv_mkdir_takes_one_arg=no
 else
@@ -6718,7 +6650,7 @@ fi
 
 
         echo $ac_n "checking for strerror in -lcposix""... $ac_c" 1>&6
-echo "configure:6722: checking for strerror in -lcposix" >&5
+echo "configure:6654: checking for strerror in -lcposix" >&5
 ac_lib_var=`echo cposix'_'strerror | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -6726,7 +6658,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lcposix  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 6730 "configure"
+#line 6662 "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
@@ -6737,7 +6669,7 @@ int main() {
 strerror()
 ; return 0; }
 EOF
-if { (eval echo configure:6741: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:6673: \"$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
@@ -6760,12 +6692,12 @@ fi
   
 
 echo $ac_n "checking for working const""... $ac_c" 1>&6
-echo "configure:6764: checking for working const" >&5
+echo "configure:6696: checking for working const" >&5
 if eval "test \"`echo '$''{'ac_cv_c_const'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6769 "configure"
+#line 6701 "configure"
 #include "confdefs.h"
 
 int main() {
@@ -6814,7 +6746,7 @@ ccp = (char const *const *) p;
 
 ; return 0; }
 EOF
-if { (eval echo configure:6818: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6750: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_const=yes
 else
@@ -6835,21 +6767,21 @@ EOF
 fi
 
 echo $ac_n "checking for inline""... $ac_c" 1>&6
-echo "configure:6839: checking for inline" >&5
+echo "configure:6771: checking for inline" >&5
 if eval "test \"`echo '$''{'ac_cv_c_inline'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   ac_cv_c_inline=no
 for ac_kw in inline __inline__ __inline; do
   cat > conftest.$ac_ext <<EOF
-#line 6846 "configure"
+#line 6778 "configure"
 #include "confdefs.h"
 
 int main() {
 } $ac_kw foo() {
 ; return 0; }
 EOF
-if { (eval echo configure:6853: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6785: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_inline=$ac_kw; break
 else
@@ -6875,12 +6807,12 @@ EOF
 esac
 
 echo $ac_n "checking for off_t""... $ac_c" 1>&6
-echo "configure:6879: checking for off_t" >&5
+echo "configure:6811: checking for off_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_off_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6884 "configure"
+#line 6816 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -6908,12 +6840,12 @@ EOF
 fi
 
 echo $ac_n "checking for size_t""... $ac_c" 1>&6
-echo "configure:6912: checking for size_t" >&5
+echo "configure:6844: checking for size_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_size_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6917 "configure"
+#line 6849 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -6943,19 +6875,19 @@ fi
 # 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""... $ac_c" 1>&6
-echo "configure:6947: checking for working alloca.h" >&5
+echo "configure:6879: checking for working alloca.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_alloca_h'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6952 "configure"
+#line 6884 "configure"
 #include "confdefs.h"
 #include <alloca.h>
 int main() {
 char *p = alloca(2 * sizeof(int));
 ; return 0; }
 EOF
-if { (eval echo configure:6959: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:6891: \"$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
@@ -6976,12 +6908,12 @@ EOF
 fi
 
 echo $ac_n "checking for alloca""... $ac_c" 1>&6
-echo "configure:6980: checking for alloca" >&5
+echo "configure:6912: checking for alloca" >&5
 if eval "test \"`echo '$''{'ac_cv_func_alloca_works'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6985 "configure"
+#line 6917 "configure"
 #include "confdefs.h"
 
 #ifdef __GNUC__
@@ -7009,7 +6941,7 @@ int main() {
 char *p = (char *) alloca(1);
 ; return 0; }
 EOF
-if { (eval echo configure:7013: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:6945: \"$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
@@ -7041,12 +6973,12 @@ EOF
 
 
 echo $ac_n "checking whether alloca needs Cray hooks""... $ac_c" 1>&6
-echo "configure:7045: checking whether alloca needs Cray hooks" >&5
+echo "configure:6977: checking whether alloca needs Cray hooks" >&5
 if eval "test \"`echo '$''{'ac_cv_os_cray'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 7050 "configure"
+#line 6982 "configure"
 #include "confdefs.h"
 #if defined(CRAY) && ! defined(CRAY2)
 webecray
@@ -7071,12 +7003,12 @@ 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:7075: checking for $ac_func" >&5
+echo "configure:7007: 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 7080 "configure"
+#line 7012 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -7099,7 +7031,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:7103: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7035: \"$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
@@ -7126,7 +7058,7 @@ done
 fi
 
 echo $ac_n "checking stack direction for C alloca""... $ac_c" 1>&6
-echo "configure:7130: checking stack direction for C alloca" >&5
+echo "configure:7062: checking stack direction for C alloca" >&5
 if eval "test \"`echo '$''{'ac_cv_c_stack_direction'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -7134,7 +7066,7 @@ else
   ac_cv_c_stack_direction=0
 else
   cat > conftest.$ac_ext <<EOF
-#line 7138 "configure"
+#line 7070 "configure"
 #include "confdefs.h"
 find_stack_direction ()
 {
@@ -7153,7 +7085,7 @@ main ()
   exit (find_stack_direction() < 0);
 }
 EOF
-if { (eval echo configure:7157: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:7089: \"$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
@@ -7174,23 +7106,289 @@ EOF
 
 fi
 
+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:7114: 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 7119 "configure"
+#include "confdefs.h"
+#include <$ac_hdr>
+EOF
+ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
+{ (eval echo configure:7124: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
+if test -z "$ac_err"; then
+  rm -rf conftest*
+  eval "ac_cv_header_$ac_safe=yes"
+else
+  echo "$ac_err" >&5
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  eval "ac_cv_header_$ac_safe=no"
+fi
+rm -f conftest*
+fi
+if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+    ac_tr_hdr=HAVE_`echo $ac_hdr | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
+  cat >> confdefs.h <<EOF
+#define $ac_tr_hdr 1
+EOF
+ 
+else
+  echo "$ac_t""no" 1>&6
+fi
+done
+
+for ac_func in getpagesize
+do
+echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
+echo "configure:7153: 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 7158 "configure"
+#include "confdefs.h"
+/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char $ac_func(); below.  */
+#include <assert.h>
+/* Override any gcc2 internal prototype to avoid an error.  */
+/* We use char because int might match the return type of a gcc2
+    builtin and then its argument prototype would still apply.  */
+char $ac_func();
+
+int main() {
+
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
+choke me
+#else
+$ac_func();
+#endif
+
+; return 0; }
+EOF
+if { (eval echo configure:7181: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+  rm -rf conftest*
+  eval "ac_cv_func_$ac_func=yes"
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  eval "ac_cv_func_$ac_func=no"
+fi
+rm -f conftest*
+fi
+
+if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+    ac_tr_func=HAVE_`echo $ac_func | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
+  cat >> confdefs.h <<EOF
+#define $ac_tr_func 1
+EOF
+ 
+else
+  echo "$ac_t""no" 1>&6
+fi
+done
+
+echo $ac_n "checking for working mmap""... $ac_c" 1>&6
+echo "configure:7206: checking for working mmap" >&5
+if eval "test \"`echo '$''{'ac_cv_func_mmap_fixed_mapped'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test "$cross_compiling" = yes; then
+  ac_cv_func_mmap_fixed_mapped=no
+else
+  cat > conftest.$ac_ext <<EOF
+#line 7214 "configure"
+#include "confdefs.h"
+
+/* Thanks to Mike Haertel and Jim Avera for this test.
+   Here is a matrix of mmap possibilities:
+	mmap private not fixed
+	mmap private fixed at somewhere currently unmapped
+	mmap private fixed at somewhere already mapped
+	mmap shared not fixed
+	mmap shared fixed at somewhere currently unmapped
+	mmap shared fixed at somewhere already mapped
+   For private mappings, we should verify that changes cannot be read()
+   back from the file, nor mmap's back from the file at a different
+   address.  (There have been systems where private was not correctly
+   implemented like the infamous i386 svr4.0, and systems where the
+   VM page cache was not coherent with the filesystem buffer cache
+   like early versions of FreeBSD and possibly contemporary NetBSD.)
+   For shared mappings, we should conversely verify that changes get
+   propogated back to all the places they're supposed to be.
+
+   Grep wants private fixed already mapped.
+   The main things grep needs to know about mmap are:
+   * does it exist and is it safe to write into the mmap'd area
+   * how to use it (BSD variants)  */
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+
+/* This mess was copied from the GNU getpagesize.h.  */
+#ifndef HAVE_GETPAGESIZE
+# ifdef HAVE_UNISTD_H
+#  include <unistd.h>
+# endif
+
+/* Assume that all systems that can run configure have sys/param.h.  */
+# ifndef HAVE_SYS_PARAM_H
+#  define HAVE_SYS_PARAM_H 1
+# endif
+
+# ifdef _SC_PAGESIZE
+#  define getpagesize() sysconf(_SC_PAGESIZE)
+# else /* no _SC_PAGESIZE */
+#  ifdef HAVE_SYS_PARAM_H
+#   include <sys/param.h>
+#   ifdef EXEC_PAGESIZE
+#    define getpagesize() EXEC_PAGESIZE
+#   else /* no EXEC_PAGESIZE */
+#    ifdef NBPG
+#     define getpagesize() NBPG * CLSIZE
+#     ifndef CLSIZE
+#      define CLSIZE 1
+#     endif /* no CLSIZE */
+#    else /* no NBPG */
+#     ifdef NBPC
+#      define getpagesize() NBPC
+#     else /* no NBPC */
+#      ifdef PAGESIZE
+#       define getpagesize() PAGESIZE
+#      endif /* PAGESIZE */
+#     endif /* no NBPC */
+#    endif /* no NBPG */
+#   endif /* no EXEC_PAGESIZE */
+#  else /* no HAVE_SYS_PARAM_H */
+#   define getpagesize() 8192	/* punt totally */
+#  endif /* no HAVE_SYS_PARAM_H */
+# endif /* no _SC_PAGESIZE */
+
+#endif /* no HAVE_GETPAGESIZE */
+
+#ifdef __cplusplus
+extern "C" { void *malloc(unsigned); }
+#else
+char *malloc();
+#endif
+
+int
+main()
+{
+	char *data, *data2, *data3;
+	int i, pagesize;
+	int fd;
+
+	pagesize = getpagesize();
+
+	/*
+	 * First, make a file with some known garbage in it.
+	 */
+	data = malloc(pagesize);
+	if (!data)
+		exit(1);
+	for (i = 0; i < pagesize; ++i)
+		*(data + i) = rand();
+	umask(0);
+	fd = creat("conftestmmap", 0600);
+	if (fd < 0)
+		exit(1);
+	if (write(fd, data, pagesize) != pagesize)
+		exit(1);
+	close(fd);
+
+	/*
+	 * Next, try to mmap the file at a fixed address which
+	 * already has something else allocated at it.  If we can,
+	 * also make sure that we see the same garbage.
+	 */
+	fd = open("conftestmmap", O_RDWR);
+	if (fd < 0)
+		exit(1);
+	data2 = malloc(2 * pagesize);
+	if (!data2)
+		exit(1);
+	data2 += (pagesize - ((int) data2 & (pagesize - 1))) & (pagesize - 1);
+	if (data2 != mmap(data2, pagesize, PROT_READ | PROT_WRITE,
+	    MAP_PRIVATE | MAP_FIXED, fd, 0L))
+		exit(1);
+	for (i = 0; i < pagesize; ++i)
+		if (*(data + i) != *(data2 + i))
+			exit(1);
+
+	/*
+	 * Finally, make sure that changes to the mapped area
+	 * do not percolate back to the file as seen by read().
+	 * (This is a bug on some variants of i386 svr4.0.)
+	 */
+	for (i = 0; i < pagesize; ++i)
+		*(data2 + i) = *(data2 + i) + 1;
+	data3 = malloc(pagesize);
+	if (!data3)
+		exit(1);
+	if (read(fd, data3, pagesize) != pagesize)
+		exit(1);
+	for (i = 0; i < pagesize; ++i)
+		if (*(data + i) != *(data3 + i))
+			exit(1);
+	close(fd);
+	unlink("conftestmmap");
+	exit(0);
+}
+
+EOF
+if { (eval echo configure:7354: \"$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
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -fr conftest*
+  ac_cv_func_mmap_fixed_mapped=no
+fi
+rm -fr conftest*
+fi
+
+fi
+
+echo "$ac_t""$ac_cv_func_mmap_fixed_mapped" 1>&6
+if test $ac_cv_func_mmap_fixed_mapped = yes; then
+  cat >> confdefs.h <<\EOF
+#define HAVE_MMAP 1
+EOF
+
+fi
+
                               
    for ac_hdr in argz.h limits.h locale.h nl_types.h malloc.h string.h \
 unistd.h sys/param.h
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
-echo "configure:7184: checking for $ac_hdr" >&5
+echo "configure:7382: 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 7189 "configure"
+#line 7387 "configure"
 #include "confdefs.h"
 #include <$ac_hdr>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:7194: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:7392: \"$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*
@@ -7220,12 +7418,12 @@ done
 strdup __argz_count __argz_stringify __argz_next
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:7224: checking for $ac_func" >&5
+echo "configure:7422: 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 7229 "configure"
+#line 7427 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -7248,7 +7446,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:7252: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7450: \"$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
@@ -7277,12 +7475,12 @@ done
      for ac_func in stpcpy
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:7281: checking for $ac_func" >&5
+echo "configure:7479: 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 7286 "configure"
+#line 7484 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -7305,7 +7503,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:7309: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7507: \"$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
@@ -7339,19 +7537,19 @@ EOF
 
    if test $ac_cv_header_locale_h = yes; then
     echo $ac_n "checking for LC_MESSAGES""... $ac_c" 1>&6
-echo "configure:7343: checking for LC_MESSAGES" >&5
+echo "configure:7541: checking for LC_MESSAGES" >&5
 if eval "test \"`echo '$''{'am_cv_val_LC_MESSAGES'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 7348 "configure"
+#line 7546 "configure"
 #include "confdefs.h"
 #include <locale.h>
 int main() {
 return LC_MESSAGES
 ; return 0; }
 EOF
-if { (eval echo configure:7355: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7553: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   am_cv_val_LC_MESSAGES=yes
 else
@@ -7372,7 +7570,7 @@ EOF
     fi
   fi
    echo $ac_n "checking whether NLS is requested""... $ac_c" 1>&6
-echo "configure:7376: checking whether NLS is requested" >&5
+echo "configure:7574: checking whether NLS is requested" >&5
         # Check whether --enable-nls or --disable-nls was given.
 if test "${enable_nls+set}" = set; then
   enableval="$enable_nls"
@@ -7392,7 +7590,7 @@ fi
 EOF
 
       echo $ac_n "checking whether included gettext is requested""... $ac_c" 1>&6
-echo "configure:7396: checking whether included gettext is requested" >&5
+echo "configure:7594: checking whether included gettext is requested" >&5
       # Check whether --with-included-gettext or --without-included-gettext was given.
 if test "${with_included_gettext+set}" = set; then
   withval="$with_included_gettext"
@@ -7411,17 +7609,17 @@ fi
 
 	ac_safe=`echo "libintl.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for libintl.h""... $ac_c" 1>&6
-echo "configure:7415: checking for libintl.h" >&5
+echo "configure:7613: checking for libintl.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 7420 "configure"
+#line 7618 "configure"
 #include "confdefs.h"
 #include <libintl.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:7425: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:7623: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -7438,19 +7636,19 @@ fi
 if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
   echo "$ac_t""yes" 1>&6
   echo $ac_n "checking for gettext in libc""... $ac_c" 1>&6
-echo "configure:7442: checking for gettext in libc" >&5
+echo "configure:7640: checking for gettext in libc" >&5
 if eval "test \"`echo '$''{'gt_cv_func_gettext_libc'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 7447 "configure"
+#line 7645 "configure"
 #include "confdefs.h"
 #include <libintl.h>
 int main() {
 return (int) gettext ("")
 ; return 0; }
 EOF
-if { (eval echo configure:7454: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7652: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   gt_cv_func_gettext_libc=yes
 else
@@ -7466,7 +7664,7 @@ echo "$ac_t""$gt_cv_func_gettext_libc" 1>&6
 
 	   if test "$gt_cv_func_gettext_libc" != "yes"; then
 	     echo $ac_n "checking for bindtextdomain in -lintl""... $ac_c" 1>&6
-echo "configure:7470: checking for bindtextdomain in -lintl" >&5
+echo "configure:7668: checking for bindtextdomain in -lintl" >&5
 ac_lib_var=`echo intl'_'bindtextdomain | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -7474,7 +7672,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lintl  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 7478 "configure"
+#line 7676 "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
@@ -7485,7 +7683,7 @@ int main() {
 bindtextdomain()
 ; return 0; }
 EOF
-if { (eval echo configure:7489: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7687: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -7501,12 +7699,12 @@ fi
 if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
   echo "$ac_t""yes" 1>&6
   echo $ac_n "checking for gettext in libintl""... $ac_c" 1>&6
-echo "configure:7505: checking for gettext in libintl" >&5
+echo "configure:7703: checking for gettext in libintl" >&5
 if eval "test \"`echo '$''{'gt_cv_func_gettext_libintl'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   echo $ac_n "checking for gettext in -lintl""... $ac_c" 1>&6
-echo "configure:7510: checking for gettext in -lintl" >&5
+echo "configure:7708: checking for gettext in -lintl" >&5
 ac_lib_var=`echo intl'_'gettext | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -7514,7 +7712,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-lintl  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 7518 "configure"
+#line 7716 "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
@@ -7525,7 +7723,7 @@ int main() {
 gettext()
 ; return 0; }
 EOF
-if { (eval echo configure:7529: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7727: \"$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
@@ -7564,7 +7762,7 @@ EOF
 	      # Extract the first word of "msgfmt", so it can be a program name with args.
 set dummy msgfmt; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:7568: checking for $ac_word" >&5
+echo "configure:7766: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_MSGFMT'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -7598,12 +7796,12 @@ fi
 		for ac_func in dcgettext
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:7602: checking for $ac_func" >&5
+echo "configure:7800: 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 7607 "configure"
+#line 7805 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -7626,7 +7824,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:7630: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7828: \"$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
@@ -7653,7 +7851,7 @@ done
 		# Extract the first word of "gmsgfmt", so it can be a program name with args.
 set dummy gmsgfmt; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:7657: checking for $ac_word" >&5
+echo "configure:7855: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_GMSGFMT'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -7689,7 +7887,7 @@ fi
 		# Extract the first word of "xgettext", so it can be a program name with args.
 set dummy xgettext; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:7693: checking for $ac_word" >&5
+echo "configure:7891: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_XGETTEXT'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -7721,7 +7919,7 @@ else
 fi
 
 		cat > conftest.$ac_ext <<EOF
-#line 7725 "configure"
+#line 7923 "configure"
 #include "confdefs.h"
 
 int main() {
@@ -7729,7 +7927,7 @@ extern int _nl_msg_cat_cntr;
 			       return _nl_msg_cat_cntr
 ; return 0; }
 EOF
-if { (eval echo configure:7733: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7931: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   CATOBJEXT=.gmo
 		   DATADIRNAME=share
@@ -7752,7 +7950,7 @@ fi
 
         if test "$CATOBJEXT" = "NONE"; then
 	  echo $ac_n "checking whether catgets can be used""... $ac_c" 1>&6
-echo "configure:7756: checking whether catgets can be used" >&5
+echo "configure:7954: checking whether catgets can be used" >&5
 	  # Check whether --with-catgets or --without-catgets was given.
 if test "${with_catgets+set}" = set; then
   withval="$with_catgets"
@@ -7765,7 +7963,7 @@ fi
 
 	  if test "$nls_cv_use_catgets" = "yes"; then
 	    	    echo $ac_n "checking for main in -li""... $ac_c" 1>&6
-echo "configure:7769: checking for main in -li" >&5
+echo "configure:7967: checking for main in -li" >&5
 ac_lib_var=`echo i'_'main | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -7773,14 +7971,14 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-li  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 7777 "configure"
+#line 7975 "configure"
 #include "confdefs.h"
 
 int main() {
 main()
 ; return 0; }
 EOF
-if { (eval echo configure:7784: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:7982: \"$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
@@ -7808,12 +8006,12 @@ else
 fi
 
 	    echo $ac_n "checking for catgets""... $ac_c" 1>&6
-echo "configure:7812: checking for catgets" >&5
+echo "configure:8010: checking for catgets" >&5
 if eval "test \"`echo '$''{'ac_cv_func_catgets'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 7817 "configure"
+#line 8015 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char catgets(); below.  */
@@ -7836,7 +8034,7 @@ catgets();
 
 ; return 0; }
 EOF
-if { (eval echo configure:7840: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:8038: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_catgets=yes"
 else
@@ -7858,7 +8056,7 @@ EOF
 	       # Extract the first word of "gencat", so it can be a program name with args.
 set dummy gencat; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:7862: checking for $ac_word" >&5
+echo "configure:8060: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_GENCAT'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -7894,7 +8092,7 @@ fi
 		 # Extract the first word of "gmsgfmt", so it can be a program name with args.
 set dummy gmsgfmt; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:7898: checking for $ac_word" >&5
+echo "configure:8096: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_GMSGFMT'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -7931,7 +8129,7 @@ fi
 		   # Extract the first word of "msgfmt", so it can be a program name with args.
 set dummy msgfmt; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:7935: checking for $ac_word" >&5
+echo "configure:8133: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_GMSGFMT'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -7966,7 +8164,7 @@ fi
 		 # Extract the first word of "xgettext", so it can be a program name with args.
 set dummy xgettext; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:7970: checking for $ac_word" >&5
+echo "configure:8168: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_XGETTEXT'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -8024,7 +8222,7 @@ fi
         # Extract the first word of "msgfmt", so it can be a program name with args.
 set dummy msgfmt; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:8028: checking for $ac_word" >&5
+echo "configure:8226: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_MSGFMT'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -8058,7 +8256,7 @@ fi
         # Extract the first word of "gmsgfmt", so it can be a program name with args.
 set dummy gmsgfmt; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:8062: checking for $ac_word" >&5
+echo "configure:8260: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_GMSGFMT'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -8094,7 +8292,7 @@ fi
         # Extract the first word of "xgettext", so it can be a program name with args.
 set dummy xgettext; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:8098: checking for $ac_word" >&5
+echo "configure:8296: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_XGETTEXT'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -8187,7 +8385,7 @@ fi
        LINGUAS=
      else
        echo $ac_n "checking for catalogs to be installed""... $ac_c" 1>&6
-echo "configure:8191: checking for catalogs to be installed" >&5
+echo "configure:8389: checking for catalogs to be installed" >&5
        NEW_LINGUAS=
        for lang in ${LINGUAS=$ALL_LINGUAS}; do
          case "$ALL_LINGUAS" in
@@ -8215,17 +8413,17 @@ echo "configure:8191: checking for catalogs to be installed" >&5
    if test "$CATOBJEXT" = ".cat"; then
      ac_safe=`echo "linux/version.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for linux/version.h""... $ac_c" 1>&6
-echo "configure:8219: checking for linux/version.h" >&5
+echo "configure:8417: checking for linux/version.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 8224 "configure"
+#line 8422 "configure"
 #include "confdefs.h"
 #include <linux/version.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:8229: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:8427: \"$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*
@@ -8300,7 +8498,7 @@ fi
 
 
 echo $ac_n "checking whether windows registry support is requested""... $ac_c" 1>&6
-echo "configure:8304: checking whether windows registry support is requested" >&5
+echo "configure:8502: checking whether windows registry support is requested" >&5
 if test x$enable_win32_registry != xno; then
   cat >> confdefs.h <<\EOF
 #define ENABLE_WIN32_REGISTRY 1
@@ -8329,7 +8527,7 @@ esac
 
 if test x$enable_win32_registry != xno; then
   echo $ac_n "checking registry key on windows hosts""... $ac_c" 1>&6
-echo "configure:8333: checking registry key on windows hosts" >&5
+echo "configure:8531: checking registry key on windows hosts" >&5
   cat >> confdefs.h <<EOF
 #define WIN32_REGISTRY_KEY "$gcc_cv_win32_registry_key"
 EOF
@@ -8505,7 +8703,7 @@ fi
 
 # Figure out what assembler alignment features are present.
 echo $ac_n "checking assembler alignment features""... $ac_c" 1>&6
-echo "configure:8509: checking assembler alignment features" >&5
+echo "configure:8707: checking assembler alignment features" >&5
 gcc_cv_as=
 gcc_cv_as_alignment_features=
 gcc_cv_as_gas_srcdir=`echo $srcdir | sed -e 's,/gcc$,,'`/gas
@@ -8626,7 +8824,7 @@ fi
 echo "$ac_t""$gcc_cv_as_alignment_features" 1>&6
 
 echo $ac_n "checking assembler subsection support""... $ac_c" 1>&6
-echo "configure:8630: checking assembler subsection support" >&5
+echo "configure:8828: checking assembler subsection support" >&5
 gcc_cv_as_subsections=
 if test x$gcc_cv_as != x; then
 	# Check if we have .subsection
@@ -8668,7 +8866,7 @@ echo "$ac_t""$gcc_cv_as_subsections" 1>&6
 case "$target" in 
   sparc*-*-*)
     echo $ac_n "checking assembler .register pseudo-op support""... $ac_c" 1>&6
-echo "configure:8672: checking assembler .register pseudo-op support" >&5
+echo "configure:8870: checking assembler .register pseudo-op support" >&5
 if eval "test \"`echo '$''{'gcc_cv_as_register_pseudo_op'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -8698,7 +8896,7 @@ EOF
     case "$tm_file" in
     *64*)
 	echo $ac_n "checking for 64 bit support in assembler ($gcc_cv_as)""... $ac_c" 1>&6
-echo "configure:8702: checking for 64 bit support in assembler ($gcc_cv_as)" >&5
+echo "configure:8900: checking for 64 bit support in assembler ($gcc_cv_as)" >&5
 if eval "test \"`echo '$''{'gcc_cv_as_flags64'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -8743,7 +8941,7 @@ EOF
 
     if test "x$gcc_cv_as_flags64" != xno; then
 	echo $ac_n "checking for assembler offsetable %lo() support""... $ac_c" 1>&6
-echo "configure:8747: checking for assembler offsetable %lo() support" >&5
+echo "configure:8945: checking for assembler offsetable %lo() support" >&5
 if eval "test \"`echo '$''{'gcc_cv_as_offsetable_lo10'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -8782,7 +8980,7 @@ EOF
 
   i[34567]86-*-*)
     echo $ac_n "checking assembler instructions""... $ac_c" 1>&6
-echo "configure:8786: checking assembler instructions" >&5
+echo "configure:8984: checking assembler instructions" >&5
     gcc_cv_as_instructions=
     if test x$gcc_cv_as != x; then
 	set "filds fists" "filds mem; fists mem"
@@ -8880,9 +9078,8 @@ if test "${with_gc+set}" = set; then
     ;;
 esac
 else
-  if test $ac_cv_func_mmap_fixed_mapped = yes; then
-  GGC=ggc-page
-elif test $ac_cv_func_valloc = yes; then
+  if test $ac_cv_func_mmap_anywhere = yes \
+    || test $ac_cv_func_valloc = yes; then
   GGC=ggc-page
 else
   GGC=ggc-simple
diff --git a/gcc/configure.in b/gcc/configure.in
index 380d740598e..7ccda1c0b7e 100644
--- a/gcc/configure.in
+++ b/gcc/configure.in
@@ -405,7 +405,7 @@ case "${host}" in
   ;;
 esac
 AC_FUNC_VFORK
-AC_FUNC_MMAP
+AC_FUNC_MMAP_ANYWHERE
 
 GCC_NEED_DECLARATIONS(bcopy bzero bcmp \
 	index rindex getenv atol sbrk abort atof strerror getcwd getwd \
@@ -4578,9 +4578,8 @@ AC_ARG_WITH(gc,
     AC_MSG_ERROR([$withval is an invalid option to --with-gc])
     ;;
 esac],
-[if test $ac_cv_func_mmap_fixed_mapped = yes; then
-  GGC=ggc-page
-elif test $ac_cv_func_valloc = yes; then
+[if test $ac_cv_func_mmap_anywhere = yes \
+    || test $ac_cv_func_valloc = yes; then
   GGC=ggc-page
 else
   GGC=ggc-simple
diff --git a/gcc/ggc-page.c b/gcc/ggc-page.c
index 7a5cec243ff..aa515eb3df3 100644
--- a/gcc/ggc-page.c
+++ b/gcc/ggc-page.c
@@ -1,5 +1,5 @@
 /* "Bag-of-pages" garbage collector for the GNU compiler.
-   Copyright (C) 1999 Free Software Foundation, Inc.
+   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
 
    This file is part of GNU CC.
 
@@ -27,7 +27,7 @@
 #include "flags.h"
 #include "ggc.h"
 
-#ifdef HAVE_MMAP
+#ifdef HAVE_MMAP_ANYWHERE
 #include <sys/mman.h>
 #endif
 
@@ -229,7 +229,7 @@ static struct globals
   unsigned char context_depth;
 
   /* A file descriptor open to /dev/zero for reading.  */
-#if defined (HAVE_MMAP) && !defined(MAP_ANONYMOUS)
+#if defined (HAVE_MMAP_ANYWHERE) && !defined(MAP_ANONYMOUS)
   int dev_zero_fd;
 #endif
 
@@ -408,7 +408,7 @@ alloc_anon (pref, size)
 {
   char *page;
 
-#ifdef HAVE_MMAP
+#ifdef HAVE_MMAP_ANYWHERE
 #ifdef MAP_ANONYMOUS
   page = (char *) mmap (pref, size, PROT_READ | PROT_WRITE,
 			MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
@@ -430,7 +430,7 @@ alloc_anon (pref, size)
       exit(1);
     }
 #endif /* HAVE_VALLOC */
-#endif /* HAVE_MMAP */
+#endif /* HAVE_MMAP_ANYWHERE */
 
   /* Remember that we allocated this memory.  */
   G.bytes_mapped += size;
@@ -533,7 +533,7 @@ free_page (entry)
 static void
 release_pages ()
 {
-#ifdef HAVE_MMAP
+#ifdef HAVE_MMAP_ANYWHERE
   page_entry *p, *next;
   char *start;
   size_t len;
@@ -579,7 +579,7 @@ release_pages ()
       free (p);
     }
 #endif /* HAVE_VALLOC */
-#endif /* HAVE_MMAP */
+#endif /* HAVE_MMAP_ANYWHERE */
 
   G.free_pages = NULL;
 }
@@ -794,7 +794,7 @@ init_ggc ()
   G.pagesize = getpagesize();
   G.lg_pagesize = exact_log2 (G.pagesize);
 
-#if defined (HAVE_MMAP) && !defined(MAP_ANONYMOUS)
+#if defined (HAVE_MMAP_ANYWHERE) && !defined(MAP_ANONYMOUS)
   G.dev_zero_fd = open ("/dev/zero", O_RDONLY);
   if (G.dev_zero_fd == -1)
     abort ();
@@ -808,7 +808,7 @@ init_ggc ()
 
   G.allocated_last_gc = GGC_MIN_LAST_ALLOCATED;
 
-#ifdef HAVE_MMAP
+#ifdef HAVE_MMAP_ANYWHERE
   /* StunOS has an amazing off-by-one error for the first mmap allocation
      after fiddling with RLIMIT_STACK.  The result, as hard as it is to
      believe, is an unaligned page allocation, which would cause us to