* m4/d-ino.m4 (gl_CHECK_TYPE_STRUCT_DIRENT_D_INO): Use better

[gnulib.git] / m4 / d-ino.m4

diff --git a/m4/d-ino.m4 b/m4/d-ino.m4
index 4d2c4db..6e6dab3 100644 (file)
--- a/m4/d-ino.m4
+++ b/m4/d-ino.m4
@@ -1,11 +1,11 @@
-#serial 7
+#serial 10
 
 dnl From Jim Meyering.
 dnl
 dnl Check whether struct dirent has a member named d_ino.
 dnl
 
-# Copyright (C) 1997, 1999, 2000, 2001, 2003, 2004 Free Software
+# Copyright (C) 1997, 1999, 2000, 2001, 2003, 2004, 2006, 2007 Free Software
 # Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
@@ -13,37 +13,29 @@ dnl
 # with or without modifications, as long as this notice is preserved.
 
 AC_DEFUN([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO],
-  [AC_REQUIRE([AC_HEADER_DIRENT])dnl
-   AC_CACHE_CHECK([for d_ino member in directory struct],
-                 jm_cv_struct_dirent_d_ino,
-     [AC_TRY_LINK(dnl
-       [
-#include <sys/types.h>
-#ifdef HAVE_DIRENT_H
-# include <dirent.h>
-#else /* not HAVE_DIRENT_H */
-# define dirent direct
-# ifdef HAVE_SYS_NDIR_H
-#  include <sys/ndir.h>
-# endif /* HAVE_SYS_NDIR_H */
-# ifdef HAVE_SYS_DIR_H
-#  include <sys/dir.h>
-# endif /* HAVE_SYS_DIR_H */
-# ifdef HAVE_NDIR_H
-#  include <ndir.h>
-# endif /* HAVE_NDIR_H */
-#endif /* HAVE_DIRENT_H */
-       ],
-       [struct dirent dp; dp.d_ino = 0;],
-
-       jm_cv_struct_dirent_d_ino=yes,
-       jm_cv_struct_dirent_d_ino=no)
-     ]
-   )
-   if test $jm_cv_struct_dirent_d_ino = yes; then
+  [AC_CACHE_CHECK([for d_ino member in directory struct],
+                 gl_cv_struct_dirent_d_ino,
+     [AC_RUN_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[#include <sys/types.h>
+            #include <sys/stat.h>
+            #include <dirent.h>
+          ]],
+          [[DIR *dp = opendir (".");
+            struct dirent *e;
+            struct stat st;
+            if (! dp)
+              return 1;
+            e = readdir (dp);
+            return ! (e
+                      && stat (e->d_name, &st) == 0
+                      && e->d_ino == st.st_ino);]])],
+           [gl_cv_struct_dirent_d_ino=yes],
+           [gl_cv_struct_dirent_d_ino=no],
+           [gl_cv_struct_dirent_d_ino=no])])
+   if test $gl_cv_struct_dirent_d_ino = yes; then
      AC_DEFINE(D_INO_IN_DIRENT, 1,
-       [Define if there is a member named d_ino in the struct describing
-        directory headers.])
+       [Define if struct dirent has a member d_ino that actually works.])
    fi
   ]
 )