1 # Configure a replacement for <sys/time.h>.
4 # Copyright (C) 2007, 2009-2012 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 dnl On native Windows with MSVC, 'struct timeval' is defined in <winsock2.h>
31 dnl only. So include that header in the list.
32 gl_PREREQ_SYS_H_WINSOCK2
33 AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],
41 # include <winsock2.h>
44 [[static struct timeval x; x.tv_sec = x.tv_usec;]])],
45 [gl_cv_sys_struct_timeval=yes],
46 [gl_cv_sys_struct_timeval=no])
48 if test $gl_cv_sys_struct_timeval != yes; then
51 dnl On native Windows with a 64-bit 'time_t', 'struct timeval' is defined
52 dnl (in <sys/time.h> and <winsock2.h> for mingw64, in <winsock2.h> only
53 dnl for MSVC) with a tv_sec field of type 'long' (32-bit!), which is
54 dnl smaller than the 'time_t' type mandated by POSIX.
55 AC_CACHE_CHECK([for correct struct timeval.tv_sec member],
56 [gl_cv_sys_struct_timeval_tv_sec],
64 # include <winsock2.h>
67 [[static struct timeval x;
68 typedef int verify_tv_sec_type[sizeof (x.tv_sec) == sizeof (time_t) ? 1 : -1];
70 [gl_cv_sys_struct_timeval_tv_sec=yes],
71 [gl_cv_sys_struct_timeval_tv_sec=no])
73 if test $gl_cv_sys_struct_timeval_tv_sec != yes; then
74 REPLACE_STRUCT_TIMEVAL=1
78 dnl Check for declarations of anything we want to poison if the
79 dnl corresponding gnulib module is not in use.
80 gl_WARN_ON_USE_PREPARE([[
82 # include <sys/time.h>
88 AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR],
90 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
91 AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
92 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
93 dnl Define it also as a C macro, for the benefit of the unit tests.
94 gl_MODULE_INDICATOR_FOR_TESTS([$1])
97 AC_DEFUN([gl_HEADER_SYS_TIME_H_DEFAULTS],
99 GNULIB_GETTIMEOFDAY=0; AC_SUBST([GNULIB_GETTIMEOFDAY])
100 dnl Assume POSIX behavior unless another module says otherwise.
101 HAVE_GETTIMEOFDAY=1; AC_SUBST([HAVE_GETTIMEOFDAY])
102 HAVE_STRUCT_TIMEVAL=1; AC_SUBST([HAVE_STRUCT_TIMEVAL])
103 HAVE_SYS_TIME_H=1; AC_SUBST([HAVE_SYS_TIME_H])
104 REPLACE_GETTIMEOFDAY=0; AC_SUBST([REPLACE_GETTIMEOFDAY])
105 REPLACE_STRUCT_TIMEVAL=0; AC_SUBST([REPLACE_STRUCT_TIMEVAL])