pathmax: PATH_MAX: use pathconf only when available

* lib/pathmax.h (PATH_MAX): Select the pathconf-using definition
only if HAVE_PATHCONF is defined.  Patch by Sylvain Beucler.
* m4/pathmax.m4 (gl_PATHMAX): Check for pathconf.
This avoids a link failure in a PSP cross-compilation environment
described in http://thread.gmane.org/gmane.comp.lib.gnulib.bugs/17048

diff --git a/ChangeLog b/ChangeLog
index 9e8f2f5..567c948 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2009-03-23  Jim Meyering  <meyering@redhat.com>
 
+       pathmax: PATH_MAX: use pathconf only when available
+       * lib/pathmax.h (PATH_MAX): Select the pathconf-using definition
+       only if HAVE_PATHCONF is defined.  Patch by Sylvain Beucler.
+       * m4/pathmax.m4 (gl_PATHMAX): Check for pathconf.
+       This avoids a link failure in a PSP cross-compilation environment
+       described in http://thread.gmane.org/gmane.comp.lib.gnulib.bugs/17048
+
        * lib/vasnprintf.c (divide): Fix typo in comment.
 
 2009-03-23  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

diff --git a/lib/pathmax.h b/lib/pathmax.h
index 6941e45..f18d760 100644 (file)
--- a/lib/pathmax.h
+++ b/lib/pathmax.h
@@ -1,5 +1,5 @@
 /* Define PATH_MAX somehow.  Requires sys/types.h.
-   Copyright (C) 1992, 1999, 2001, 2003, 2005 Free Software Foundation, Inc.
+   Copyright (C) 1992, 1999, 2001, 2003, 2005, 2009 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -26,7 +26,7 @@
 #  define _POSIX_PATH_MAX 256
 # endif
 
-# if !defined PATH_MAX && defined _PC_PATH_MAX
+# if !defined PATH_MAX && defined _PC_PATH_MAX && defined HAVE_PATHCONF
 #  define PATH_MAX (pathconf ("/", _PC_PATH_MAX) < 1 ? 1024 \
                    : pathconf ("/", _PC_PATH_MAX))
 # endif

diff --git a/m4/pathmax.m4 b/m4/pathmax.m4
index e88fdb4..4651801 100644 (file)
--- a/m4/pathmax.m4
+++ b/m4/pathmax.m4
@@ -1,4 +1,4 @@
-# pathmax.m4 serial 7
+# pathmax.m4 serial 8
 dnl Copyright (C) 2002, 2003, 2005, 2006, 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,
@@ -7,5 +7,6 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_PATHMAX],
 [
   dnl Prerequisites of lib/pathmax.h.
+  AC_CHECK_FUNCS_ONCE([pathconf])
   AC_CHECK_HEADERS_ONCE([sys/param.h])
 ])