1 # Configure a replacement for <sys/time.h>.
4 # Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
5 # This file is free software; the Free Software Foundation
6 # gives unlimited permission to copy and/or distribute it,
7 # with or without modifications, as long as this notice is preserved.
9 # Written by Paul Eggert and Martin Lambers.
11 AC_DEFUN([gl_HEADER_SYS_TIME_H],
13 dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement
14 dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1
15 dnl statements that occur in other macros.
16 AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY])
19 AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],
21 AC_REQUIRE([AC_C_RESTRICT])
22 AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
23 AC_CHECK_HEADERS_ONCE([sys/time.h])
24 gl_CHECK_NEXT_HEADERS([sys/time.h])
26 if test $ac_cv_header_sys_time_h != yes; then
30 AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],
38 [[static struct timeval x; x.tv_sec = x.tv_usec;]])],
39 [gl_cv_sys_struct_timeval=yes],
40 [gl_cv_sys_struct_timeval=no])])
41 if test $gl_cv_sys_struct_timeval != yes; then
45 dnl Check for declarations of anything we want to poison if the
46 dnl corresponding gnulib module is not in use.
47 gl_WARN_ON_USE_PREPARE([[
49 # include <sys/time.h>
55 AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR],
57 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
58 AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
59 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
60 dnl Define it also as a C macro, for the benefit of the unit tests.
61 gl_MODULE_INDICATOR_FOR_TESTS([$1])
64 AC_DEFUN([gl_HEADER_SYS_TIME_H_DEFAULTS],
66 GNULIB_GETTIMEOFDAY=0; AC_SUBST([GNULIB_GETTIMEOFDAY])
67 dnl Assume POSIX behavior unless another module says otherwise.
68 HAVE_GETTIMEOFDAY=1; AC_SUBST([HAVE_GETTIMEOFDAY])
69 HAVE_STRUCT_TIMEVAL=1; AC_SUBST([HAVE_STRUCT_TIMEVAL])
70 HAVE_SYS_TIME_H=1; AC_SUBST([HAVE_SYS_TIME_H])
71 REPLACE_GETTIMEOFDAY=0; AC_SUBST([REPLACE_GETTIMEOFDAY])