1# opendir.m4 serial 5
2dnl Copyright (C) 2011-2020 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7AC_DEFUN([gl_FUNC_OPENDIR],
8[
9  AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
10  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
11
12  AC_CHECK_FUNCS([opendir])
13  if test $ac_cv_func_opendir = no; then
14    HAVE_OPENDIR=0
15  fi
16  dnl Replace opendir() for supporting the gnulib-defined fchdir() function,
17  dnl to keep fchdir's bookkeeping up-to-date.
18  m4_ifdef([gl_FUNC_FCHDIR], [
19    gl_TEST_FCHDIR
20    if test $HAVE_FCHDIR = 0; then
21      if test $HAVE_OPENDIR = 1; then
22        REPLACE_OPENDIR=1
23      fi
24    fi
25  ])
26  dnl Replace opendir() on OS/2 kLIBC to support dirfd() function replaced
27  dnl by gnulib.
28  case $host_os,$HAVE_OPENDIR in
29    os2*,1)
30      REPLACE_OPENDIR=1;;
31  esac
32])
33