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1# Configure a replacement for <sys/time.h>.
2
3# Copyright (C) 2007 Free Software Foundation, Inc.
4# This file is free software; the Free Software Foundation
5# gives unlimited permission to copy and/or distribute it,
6# with or without modifications, as long as this notice is preserved.
7
8# Written by Paul Eggert and Martin Lambers.
9
10AC_DEFUN([gl_HEADER_SYS_TIME_H],
11[
12  dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement
13  dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1
14  dnl statements that occur in other macros.
15  AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY])
16])
17
18AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],
19[
20  AC_REQUIRE([AC_C_RESTRICT])
21  gl_CHECK_NEXT_HEADERS([sys/time.h])
22
23  if test $ac_cv_header_sys_time_h = yes; then
24    HAVE_SYS_TIME_H=1
25  else
26    HAVE_SYS_TIME_H=0
27  fi
28  AC_SUBST([HAVE_SYS_TIME_H])
29
30  AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],
31    [AC_COMPILE_IFELSE(
32       [AC_LANG_PROGRAM(
33	  [[#if HAVE_SYS_TIME_H
34	     #include <sys/time.h>
35	    #endif
36	    #include <time.h>
37	  ]],
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
42    HAVE_STRUCT_TIMEVAL=1
43  else
44    HAVE_STRUCT_TIMEVAL=0
45  fi
46  AC_SUBST([HAVE_STRUCT_TIMEVAL])
47
48  dnl Assume POSIX behavior unless another module says otherwise.
49  REPLACE_GETTIMEOFDAY=0
50  AC_SUBST([REPLACE_GETTIMEOFDAY])
51  if test $HAVE_SYS_TIME_H = 0 || test $HAVE_STRUCT_TIMEVAL = 0; then
52    SYS_TIME_H=sys/time.h
53  else
54    SYS_TIME_H=
55  fi
56  AC_SUBST([SYS_TIME_H])
57])
58