# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1242175025 -7200
# Node ID 1c79166ed6a43d2460560ab810afe8b26ec7c755
# Parent  1ffd251f5b051edd1e4cef2384fea4c4be45cd42
Make the MAP_ANONYMOUS detection work on HP-UX 11.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2009-05-12  Bruno Haible  <bruno@clisp.org>
+
+	Make the MAP_ANONYMOUS detection work on HP-UX 11.
+	* m4/mmap-anon.m4 (gl_FUNC_MMAP_ANON): Check whether mmap exists, but
+	not whether its fully works.
+
 2009-05-12  Bruno Haible  <bruno@clisp.org>
 
 	* m4/mmap-anon.m4 (gl_FUNC_MMAP_ANON): Add comments.
diff --git a/m4/mmap-anon.m4 b/m4/mmap-anon.m4
--- a/m4/mmap-anon.m4
+++ b/m4/mmap-anon.m4
@@ -1,4 +1,4 @@
-# mmap-anon.m4 serial 6
+# mmap-anon.m4 serial 7
 dnl Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -22,12 +22,14 @@
   dnl Persuade glibc <sys/mman.h> to define MAP_ANONYMOUS.
   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
 
-  # Check for mmap()
-  AC_FUNC_MMAP
+  # Check for mmap(). Don't use AC_FUNC_MMAP, because it checks too much: it
+  # fails on HP-UX 11, because MAP_FIXED mappings do not work. But this is
+  # irrelevant for anonymous mappings.
+  AC_CHECK_FUNC([mmap], [gl_have_mmap=yes], [gl_have_mmap=no])
 
   # Try to allow MAP_ANONYMOUS.
   gl_have_mmap_anonymous=no
-  if test $ac_cv_func_mmap_fixed_mapped = yes; then
+  if test $gl_have_mmap = yes; then
     AC_MSG_CHECKING([for MAP_ANONYMOUS])
     AC_EGREP_CPP([I cant identify this map.], [
 #include <sys/mman.h>