Re: Small patch for chdir-long.m4 and fpending.m4

[Paul Eggert]

Thanks for the bug report archived in
<http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00326.html>.
I installed this slightly-different patch into coreutils and gnulib:

2005-10-30  Paul Eggert  <address@hidden>

        * m4/chdir-long.m4 (gl_FUNC_CHDIR_LONG): Revamp wording and local
        variables to suggest the intended function of the PATH_MAX check.

2005-10-30  Kean Johnston  <address@hidden>

        Trivial changes to support SCO systems.
        * m4/chdir-long.m4 (gl_FUNC_CHDIR_LONG): Check for MAXPATHLEN as well
        as PATH_MAX.
        * m4/fpending.m4 (gl_FUNC_FPENDING): Correct check for SCO systems,
        where __ptr is null when no I/O is pending.

--- m4/chdir-long.m4    2 Oct 2005 22:38:45 -0000       1.3
+++ m4/chdir-long.m4    30 Oct 2005 23:06:27 -0000
@@ -1,4 +1,4 @@
-#serial 6
+#serial 7
 
 # Use Gnulib's robust chdir function.
 # It can handle arbitrarily long directory names, which means
@@ -16,18 +16,18 @@ dnl with or without modifications, as lo
 AC_DEFUN([gl_FUNC_CHDIR_LONG],
 [
   AC_LIBSOURCES([chdir-long.c, chdir-long.h])
-  AC_CACHE_CHECK([whether this system has a definition of PATH_MAX],
-    gl_have_path_max_definition,
-    [AC_EGREP_CPP([have_path_max_definition],
+  AC_CACHE_CHECK([whether this system has an arbitrary file name length limit],
+    gl_have_arbitrary_file_name_length_limit,
+    [AC_EGREP_CPP([have_arbitrary_file_name_length_limit],
                   [#include <unistd.h>
 #include <limits.h>
-#ifdef PATH_MAX
-have_path_max_definition
+#if defined PATH_MAX || defined MAXPATHLEN
+have_arbitrary_file_name_length_limit
 #endif],
-    gl_have_path_max_definition=yes,
-    gl_have_path_max_definition=no)])
+    gl_have_arbitrary_file_name_length_limit=yes,
+    gl_have_arbitrary_file_name_length_limit=no)])
 
-  if test $gl_have_path_max_definition = yes; then
+  if test $gl_have_arbitrary_file_name_length_limit = yes; then
     AC_LIBOBJ([chdir-long])
     gl_PREREQ_CHDIR_LONG
   fi
--- m4/fpending.m4      21 Mar 2005 22:06:27 -0000      1.12
+++ m4/fpending.m4      30 Oct 2005 23:06:27 -0000
@@ -1,4 +1,4 @@
-#serial 6
+#serial 7
 
 # Copyright (C) 2000, 2001, 2004, 2005 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -42,7 +42,7 @@ AC_DEFUN([gl_FUNC_FPENDING],
            'fp->_p - fp->_bf._base'                            \
                                                                \
            '# SCO, Unixware'                                   \
-           'fp->__ptr - fp->__base'                            \
+           '(fp->__ptr ? fp->__ptr - fp->__base : 0)'          \
                                                                \
            '# old glibc?'                                      \
            'fp->__bufp - fp->__buffer'                         \