2 dnl Copyright (C) 2010-2020 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 dnl Written by Bruno Haible.
11 dnl Use AC_REQUIRE here, so that the default behavior below is expanded
12 dnl once only, before all statements that occur in other macros.
13 AC_REQUIRE([gl_POLL_H_DEFAULTS])
15 AC_CHECK_HEADERS_ONCE([poll.h])
16 if test $ac_cv_header_poll_h = yes; then
21 AC_SUBST([HAVE_POLL_H])
23 dnl <poll.h> is always overridden, because of GNULIB_POSIXCHECK.
24 gl_CHECK_NEXT_HEADERS([poll.h])
26 gl_PREREQ_SYS_H_WINSOCK2 dnl for HAVE_WINSOCK2_H
28 dnl Check for declarations of anything we want to poison if the
29 dnl corresponding gnulib module is not in use.
30 gl_WARN_ON_USE_PREPARE([[#include <poll.h>]],
34 AC_DEFUN([gl_POLL_MODULE_INDICATOR],
36 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
37 AC_REQUIRE([gl_POLL_H_DEFAULTS])
38 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
39 dnl Define it also as a C macro, for the benefit of the unit tests.
40 gl_MODULE_INDICATOR_FOR_TESTS([$1])
43 AC_DEFUN([gl_POLL_H_DEFAULTS],
45 GNULIB_POLL=0; AC_SUBST([GNULIB_POLL])
46 dnl Assume proper GNU behavior unless another module says otherwise.
47 HAVE_POLL=1; AC_SUBST([HAVE_POLL])
48 REPLACE_POLL=0; AC_SUBST([REPLACE_POLL])