# HG changeset patch
# User Eric Blake <ebb9@byu.net>
# Date 1251730845 21600
# Node ID 79f4b013feab76a082154cc288e969c962d28cf9
# Parent  6a1268d2cf2abf428094f94d93b11735ffee740a
chown: avoid compilation warning on mingw

* m4/chown.m4 (gl_FUNC_CHOWN): Recognize missing chown.
* lib/chown.c (rpl_chown) [!HAVE_CHOWN]: Always return failure on
mingw.
* lib/lchown.c (lchown) [!HAVE_CHOWN]: Likewise.
* modules/chown (Depends-on): Add errno.

Signed-off-by: Eric Blake <ebb9@byu.net>

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2009-08-31  Eric Blake  <ebb9@byu.net>
+
+	chown: avoid compilation warning on mingw
+	* m4/chown.m4 (gl_FUNC_CHOWN): Recognize missing chown.
+	* lib/chown.c (rpl_chown) [!HAVE_CHOWN]: Always return failure on
+	mingw.
+	* lib/lchown.c (lchown) [!HAVE_CHOWN]: Likewise.
+	* modules/chown (Depends-on): Add errno.
+
 2009-08-31  Stefano Lattarini  <stefano.lattarini@gmail.com>  (tiny change)
 
 	* gnulib-tool: Fix test whether $CONFIG_SHELL has a working 'echo'
diff --git a/lib/chown.c b/lib/chown.c
--- a/lib/chown.c
+++ b/lib/chown.c
@@ -1,7 +1,7 @@
 /* provide consistent interface to chown for systems that don't interpret
    an ID of -1 as meaning `don't change the corresponding ID'.
 
-   Copyright (C) 1997, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2004-2007, 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
@@ -46,7 +46,8 @@
 int
 rpl_chown (const char *file, uid_t uid, gid_t gid)
 {
-#if CHOWN_FAILS_TO_HONOR_ID_OF_NEGATIVE_ONE
+#if HAVE_CHOWN
+# if CHOWN_FAILS_TO_HONOR_ID_OF_NEGATIVE_ONE
   if (gid == (gid_t) -1 || uid == (uid_t) -1)
     {
       struct stat file_stats;
@@ -61,9 +62,9 @@
       if (uid == (uid_t) -1)
 	uid = file_stats.st_uid;
     }
-#endif
+# endif
 
-#if CHOWN_MODIFIES_SYMLINK
+# if CHOWN_MODIFIES_SYMLINK
   {
     /* Handle the case in which the system-supplied chown function
        does *not* follow symlinks.  Instead, it changes permissions
@@ -97,7 +98,12 @@
     else if (errno != EACCES)
       return -1;
   }
-#endif
+# endif
 
   return chown (file, uid, gid);
+
+#else /* !HAVE_CHOWN */
+  errno = EOPNOTSUPP;
+  return -1;
+#endif
 }
diff --git a/lib/lchown.c b/lib/lchown.c
--- a/lib/lchown.c
+++ b/lib/lchown.c
@@ -1,7 +1,7 @@
 /* Provide a stub lchown function for systems that lack it.
 
-   Copyright (C) 1998, 1999, 2002, 2004, 2006, 2007 Free Software
-   Foundation, Inc.
+   Copyright (C) 1998, 1999, 2002, 2004, 2006, 2007, 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
@@ -48,7 +48,8 @@
 int
 lchown (const char *file, uid_t uid, gid_t gid)
 {
-#if ! CHOWN_MODIFIES_SYMLINK
+#if HAVE_CHOWN
+# if ! CHOWN_MODIFIES_SYMLINK
   struct stat stats;
 
   if (lstat (file, &stats) == 0 && S_ISLNK (stats.st_mode))
@@ -56,7 +57,12 @@
       errno = EOPNOTSUPP;
       return -1;
     }
-#endif
+# endif
 
   return chown (file, uid, gid);
+
+#else /* !HAVE_CHOWN */
+  errno = EOPNOTSUPP;
+  return -1;
+#endif
 }
diff --git a/m4/chown.m4 b/m4/chown.m4
--- a/m4/chown.m4
+++ b/m4/chown.m4
@@ -1,4 +1,4 @@
-# serial 18
+# serial 19
 # Determine whether we need the chown wrapper.
 
 dnl Copyright (C) 1997-2001, 2003-2005, 2007, 2009
@@ -20,6 +20,7 @@
   AC_REQUIRE([AC_TYPE_UID_T])
   AC_REQUIRE([AC_FUNC_CHOWN])
   AC_REQUIRE([gl_FUNC_CHOWN_FOLLOWS_SYMLINK])
+  AC_CHECK_FUNCS_ONCE([chown])
 
   if test $ac_cv_func_chown_works = no; then
     AC_DEFINE([CHOWN_FAILS_TO_HONOR_ID_OF_NEGATIVE_ONE], [1],
diff --git a/modules/chown b/modules/chown
--- a/modules/chown
+++ b/modules/chown
@@ -7,6 +7,7 @@
 m4/chown.m4
 
 Depends-on:
+errno
 open
 unistd
 sys_stat