Make the MAP_ANONYMOUS detection work on HP-UX 11.

diff --git a/ChangeLog b/ChangeLog
index ffa4100a382ed9fdd2bb806861045f8b28447e0c..313291e4e37e3f8642a22f9776b1d71120418163 100644 (file)
--- 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
index 91cd95b232862850cad26daa3732ce8902ab4aab..fe624a2c0232a231db91517aa8c59ebbd5137f52 100644 (file)
--- 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 @@ AC_DEFUN([gl_FUNC_MMAP_ANON],
   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>