X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fdirfd.m4;h=7fefa2e483acfa164b4109829b0339dff123e2a3;hb=062cad2d07081f9a60adbb90fc1184a435a1a93f;hp=9e26d52104b385796a43a52f762b4d1c1f59f7f2;hpb=d76a6493392c315ba9da4a262efaa430b1a72476;p=gnulib.git

diff --git a/m4/dirfd.m4 b/m4/dirfd.m4
index 9e26d5210..7fefa2e48 100644
--- a/m4/dirfd.m4
+++ b/m4/dirfd.m4
@@ -1,9 +1,8 @@
-#serial 12   -*- Autoconf -*-
+# serial 17   -*- 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.
+# Copyright (C) 2001-2006, 2008-2010 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.
@@ -12,27 +11,29 @@ dnl From Jim Meyering
 
 AC_DEFUN([gl_FUNC_DIRFD],
 [
-  AC_LIBSOURCES([dirfd.c, dirfd.h])
+  AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
+  gl_REPLACE_DIRENT_H
+
+  dnl Persuade glibc <dirent.h> to declare dirfd().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
 
   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_HEADERS_ONCE([dirent.h])dnl
 
-  dirfd_headers='
-#if HAVE_DIRENT_H
-# include <dirent.h>
-#else
-# define dirent direct
-# include <ndir.h>
-#endif
-'
-  AC_CHECK_FUNCS(dirfd)
-  AC_CHECK_DECLS([dirfd], , , $dirfd_headers)
+  AC_CHECK_FUNCS([dirfd])
+  AC_CHECK_DECLS([dirfd], , ,
+    [#include <sys/types.h>
+     #include <dirent.h>])
+  if test $ac_cv_have_decl_dirfd = no; then
+    HAVE_DECL_DIRFD=0
+  fi
 
   AC_CACHE_CHECK([whether dirfd is a macro],
     gl_cv_func_dirfd_macro,
-    [AC_EGREP_CPP([dirent_header_defines_dirfd], [$dirfd_headers
+    [AC_EGREP_CPP([dirent_header_defines_dirfd], [
+#include <sys/types.h>
+#include <dirent.h>
 #ifdef dirfd
  dirent_header_defines_dirfd
 #endif],
@@ -45,34 +46,34 @@ AC_DEFUN([gl_FUNC_DIRFD],
       = no,no,no; then
     AC_REPLACE_FUNCS([dirfd])
     AC_CACHE_CHECK(
-	      [how to get the file descriptor associated with an open DIR*],
-		   gl_cv_sys_dir_fd_member_name,
+              [how to get the file descriptor associated with an open DIR*],
+                   gl_cv_sys_dir_fd_member_name,
       [
-	dirfd_save_CFLAGS=$CFLAGS
-	for ac_expr in d_fd dd_fd; do
+        dirfd_save_CFLAGS=$CFLAGS
+        for ac_expr in d_fd dd_fd; do
 
-	  CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr"
-	  AC_TRY_COMPILE(
-	    [$dirfd_headers
-	    ],
-	    [DIR *dir_p = opendir("."); (void) dir_p->DIR_FD_MEMBER_NAME;],
-	    dir_fd_found=yes
-	  )
-	  CFLAGS=$dirfd_save_CFLAGS
-	  test "$dir_fd_found" = yes && break
-	done
-	test "$dir_fd_found" = yes || ac_expr=no_such_member
+          CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr"
+          AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+             #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=no_such_member
 
-	gl_cv_sys_dir_fd_member_name=$ac_expr
+        gl_cv_sys_dir_fd_member_name=$ac_expr
       ]
     )
     if test $gl_cv_sys_dir_fd_member_name != no_such_member; then
-      AC_DEFINE_UNQUOTED(DIR_FD_MEMBER_NAME,
-	$gl_cv_sys_dir_fd_member_name,
-	[the name of the file descriptor member of DIR])
+      AC_DEFINE_UNQUOTED([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,
-		[#ifdef DIR_FD_MEMBER_NAME
+                [#ifdef DIR_FD_MEMBER_NAME
 # define DIR_TO_FD(Dir_p) ((Dir_p)->DIR_FD_MEMBER_NAME)
 #else
 # define DIR_TO_FD(Dir_p) -1