AC_DEFUN([gl_AC_DOS],
[
AC_CACHE_CHECK([whether system is Windows or MSDOS], [ac_cv_win_or_dos],
[
AC_TRY_COMPILE([],
[neither MSDOS nor Windows
[ac_cv_win_or_dos=yes],
[ac_cv_win_or_dos=no])
])
if test x"$ac_cv_win_or_dos" = xyes; then
ac_fs_accepts_drive_letter_prefix=1
ac_fs_backslash_is_file_name_separator=1
AC_CACHE_CHECK([whether drive letter can start relative path],
[ac_cv_drive_letter_can_be_relative],
[
AC_TRY_COMPILE([],
[drive letters are always absolute
[ac_cv_drive_letter_can_be_relative=yes],
[ac_cv_drive_letter_can_be_relative=no])
])
if test x"$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
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
`drive letter' prefix, define this to compute the length of that
prefix, including the colon.])
AH_VERBATIM(ISSLASH,
[
AC_DEFINE_UNQUOTED([FILE_SYSTEM_BACKSLASH_IS_FILE_NAME_SEPARATOR],
$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.])
])