X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fdirfd.m4;h=125966b1a01bc42c4e562b0b30f84a6019e67efc;hb=a903e10b42da3dac442053e389832f003f58528a;hp=f18bf80f8c18ba44bb073a33c2d0ec3617d339ab;hpb=e33b31cde320bb4e771091e973268690744bf994;p=gnulib.git

diff --git a/m4/dirfd.m4 b/m4/dirfd.m4
index f18bf80f8..125966b1a 100644
--- a/m4/dirfd.m4
+++ b/m4/dirfd.m4
@@ -1,59 +1,66 @@
-#serial 1
+#serial 14   -*- Autoconf -*-
 
 dnl Find out how to get the file descriptor associated with an open DIR*.
+
+# Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 Free Software
+# Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
 dnl From Jim Meyering
 
-AC_DEFUN([UTILS_FUNC_DIRFD],
+AC_DEFUN([gl_FUNC_DIRFD],
 [
-  AC_HEADER_DIRENT
-  dirfd_headers='
-#if HAVE_DIRENT_H
-# include <dirent.h>
-#else /* not HAVE_DIRENT_H */
-# define dirent direct
-# if HAVE_SYS_NDIR_H
-#  include <sys/ndir.h>
-# endif /* HAVE_SYS_NDIR_H */
-# if HAVE_SYS_DIR_H
-#  include <sys/dir.h>
-# endif /* HAVE_SYS_DIR_H */
-# if HAVE_NDIR_H
-#  include <ndir.h>
-# endif /* HAVE_NDIR_H */
-#endif /* HAVE_DIRENT_H */
-'
+  dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
+  AC_REQUIRE([AC_PROG_CPP])
+  AC_REQUIRE([AC_PROG_EGREP])
   AC_CHECK_FUNCS(dirfd)
-  AC_CHECK_DECLS([dirfd], , , $dirfd_headers)
+  AC_CHECK_DECLS([dirfd], , ,
+    [#include <sys/types.h>
+     #include <dirent.h>])
+
+  AC_CACHE_CHECK([whether dirfd is a macro],
+    gl_cv_func_dirfd_macro,
+    [AC_EGREP_CPP([dirent_header_defines_dirfd], [
+#include <sys/types.h>
+#include <dirent.h>
+#ifdef dirfd
+ dirent_header_defines_dirfd
+#endif],
+       gl_cv_func_dirfd_macro=yes,
+       gl_cv_func_dirfd_macro=no)])
 
-  # Use the replacement only if we have neither the function
-  # nor a declaration.
-  if test $ac_cv_func_dirfd,$ac_cv_have_decl_dirfd = no,no; then
+  # Use the replacement only if we have no function, macro,
+  # or declaration with that name.
+  if test $ac_cv_func_dirfd,$ac_cv_have_decl_dirfd,$gl_cv_func_dirfd_macro \
+      = no,no,no; then
     AC_REPLACE_FUNCS([dirfd])
     AC_CACHE_CHECK(
 	      [how to get the file descriptor associated with an open DIR*],
-		   ac_cv_sys_dir_fd_member_name,
+		   gl_cv_sys_dir_fd_member_name,
       [
-        dirfd_save_CFLAGS=$CFLAGS
+	dirfd_save_CFLAGS=$CFLAGS
 	for ac_expr in d_fd dd_fd; do
 
 	  CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr"
 	  AC_TRY_COMPILE(
-	    [$dirfd_headers
-	    ],
+	    [#include <sys/types.h>
+	     #include <dirent.h>],
 	    [DIR *dir_p = opendir("."); (void) dir_p->DIR_FD_MEMBER_NAME;],
 	    dir_fd_found=yes
 	  )
 	  CFLAGS=$dirfd_save_CFLAGS
 	  test "$dir_fd_found" = yes && break
 	done
-	test "$dir_fd_found" = yes || ac_expr=-1
+	test "$dir_fd_found" = yes || ac_expr=no_such_member
 
-	ac_cv_sys_dir_fd_member_name=$ac_expr
+	gl_cv_sys_dir_fd_member_name=$ac_expr
       ]
     )
-    if test $ac_cv_have_decl_dirfd = -1; then
+    if test $gl_cv_sys_dir_fd_member_name != no_such_member; then
       AC_DEFINE_UNQUOTED(DIR_FD_MEMBER_NAME,
-	$ac_cv_sys_dir_fd_member_name,
+	$gl_cv_sys_dir_fd_member_name,
 	[the name of the file descriptor member of DIR])
     fi
     AH_VERBATIM(DIR_TO_FD,
@@ -62,7 +69,6 @@ AC_DEFUN([UTILS_FUNC_DIRFD],
 #else
 # define DIR_TO_FD(Dir_p) -1
 #endif
-]
-    )
+])
   fi
 ])