New module 'time', so that apps can include <time.h> as per

[gnulib.git] / m4 / dos.m4

diff --git a/m4/dos.m4 b/m4/dos.m4
index 0713cf1..dd59571 100644 (file)
--- a/m4/dos.m4
+++ b/m4/dos.m4
@@ -1,9 +1,9 @@
-#serial 9
+#serial 10   -*- autoconf -*-
 
 # Define some macros required for proper operation of code in lib/*.c
 # on MSDOS/Windows systems.
 
-# Copyright (C) 2000, 2001, 2004 Free Software Foundation, Inc.
+# Copyright (C) 2000, 2001, 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.
@@ -14,30 +14,38 @@ AC_DEFUN([gl_AC_DOS],
   [
     AC_CACHE_CHECK([whether system is Windows or MSDOS], [ac_cv_win_or_dos],
       [
-        AC_TRY_COMPILE([],
-        [#if !defined _WIN32 && !defined __WIN32__ && !defined __MSDOS__ && !defined __CYGWIN__
+       AC_TRY_COMPILE([],
+       [#if !defined _WIN32 && !defined __WIN32__ && !defined __MSDOS__ && !defined __CYGWIN__
 neither MSDOS nor Windows
 #endif],
-        [ac_cv_win_or_dos=yes],
-        [ac_cv_win_or_dos=no])
+       [ac_cv_win_or_dos=yes],
+       [ac_cv_win_or_dos=no])
       ])
 
     if test x"$ac_cv_win_or_dos" = xyes; then
       ac_fs_accepts_drive_letter_prefix=1
       ac_fs_backslash_is_file_name_separator=1
+      AC_CACHE_CHECK([whether drive letter can start relative path],
+                    [ac_cv_drive_letter_can_be_relative],
+       [
+         AC_TRY_COMPILE([],
+         [#if defined __CYGWIN__
+drive letters are always absolute
+#endif],
+         [ac_cv_drive_letter_can_be_relative=yes],
+         [ac_cv_drive_letter_can_be_relative=no])
+       ])
+      if test x"$ac_cv_drive_letter_can_be_relative" = xyes; then
+       ac_fs_drive_letter_can_be_relative=1
+      else
+       ac_fs_drive_letter_can_be_relative=0
+      fi
     else
       ac_fs_accepts_drive_letter_prefix=0
       ac_fs_backslash_is_file_name_separator=0
+      ac_fs_drive_letter_can_be_relative=0
     fi
 
-    AH_VERBATIM(FILE_SYSTEM_PREFIX_LEN,
-    [#if FILE_SYSTEM_ACCEPTS_DRIVE_LETTER_PREFIX
-# define FILE_SYSTEM_PREFIX_LEN(Filename) \
-  ((Filename)[0] && (Filename)[1] == ':' ? 2 : 0)
-#else
-# define FILE_SYSTEM_PREFIX_LEN(Filename) 0
-#endif])
-
     AC_DEFINE_UNQUOTED([FILE_SYSTEM_ACCEPTS_DRIVE_LETTER_PREFIX],
       $ac_fs_accepts_drive_letter_prefix,
       [Define on systems for which file names may have a so-called
@@ -55,4 +63,9 @@ neither MSDOS nor Windows
       $ac_fs_backslash_is_file_name_separator,
       [Define if the backslash character may also serve as a file name
        component separator.])
+
+    AC_DEFINE_UNQUOTED([FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE],
+      $ac_fs_drive_letter_can_be_relative,
+      [Define if a drive letter prefix denotes a relative path if it is
+       not followed by a file name component separator.])
   ])