-# fcntl-o.m4 serial 4
-dnl Copyright (C) 2006, 2009-2012 Free Software Foundation, Inc.
+# fcntl-o.m4 serial 5
+dnl Copyright (C) 2006, 2009-2018 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
[AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])],
[AC_REQUIRE([AC_GNU_SOURCE])])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_HEADERS_ONCE([unistd.h])
AC_CHECK_FUNCS_ONCE([symlink])
AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h],
#if HAVE_SYMLINK
{
static char const sym[] = "conftest.sym";
- if (symlink (".", sym) != 0)
+ if (symlink ("/dev/null", sym) != 0)
+ result |= 2;
+ else
+ {
+ int fd = open (sym, O_WRONLY | O_NOFOLLOW | O_CREAT, 0);
+ if (fd >= 0)
+ {
+ close (fd);
+ result |= 4;
+ }
+ }
+ if (unlink (sym) != 0 || symlink (".", sym) != 0)
result |= 2;
else
{
68) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #(
*) gl_cv_header_working_fcntl_h='no';;
esac],
- [gl_cv_header_working_fcntl_h=cross-compiling])])
+ [case "$host_os" in
+ # Guess 'no' on native Windows.
+ mingw*) gl_cv_header_working_fcntl_h='no' ;;
+ *) gl_cv_header_working_fcntl_h=cross-compiling ;;
+ esac
+ ])
+ ])
case $gl_cv_header_working_fcntl_h in #(
*O_NOATIME* | no | cross-compiling) ac_val=0;; #(