[bpt/guile.git] / m4 / sys_time_h.m4

# Configure a replacement for <sys/time.h>.
# serial 7

# Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# Written by Paul Eggert and Martin Lambers.

AC_DEFUN([gl_HEADER_SYS_TIME_H],
[
  dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement
  dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1
  dnl statements that occur in other macros.
  AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY])
])

AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],
[
  AC_REQUIRE([AC_C_RESTRICT])
  AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
  AC_CHECK_HEADERS_ONCE([sys/time.h])
  gl_CHECK_NEXT_HEADERS([sys/time.h])

  if test $ac_cv_header_sys_time_h != yes; then
    HAVE_SYS_TIME_H=0
  fi

  dnl On native Windows with MSVC, 'struct timeval' is defined in <winsock2.h>
  dnl only. So include that header in the list.
  gl_PREREQ_SYS_H_WINSOCK2
  AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],
    [AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM(
          [[#if HAVE_SYS_TIME_H
             #include <sys/time.h>
            #endif
            #include <time.h>
            #if HAVE_WINSOCK2_H
            # include <winsock2.h>
            #endif
          ]],
          [[static struct timeval x; x.tv_sec = x.tv_usec;]])],
       [gl_cv_sys_struct_timeval=yes],
       [gl_cv_sys_struct_timeval=no])])
  if test $gl_cv_sys_struct_timeval != yes; then
    HAVE_STRUCT_TIMEVAL=0
  fi

  dnl Check for declarations of anything we want to poison if the
  dnl corresponding gnulib module is not in use.
  gl_WARN_ON_USE_PREPARE([[
#if HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <time.h>
    ]], [gettimeofday])
])

AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR],
[
  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
  AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
  dnl Define it also as a C macro, for the benefit of the unit tests.
  gl_MODULE_INDICATOR_FOR_TESTS([$1])
])

AC_DEFUN([gl_HEADER_SYS_TIME_H_DEFAULTS],
[
  GNULIB_GETTIMEOFDAY=0;     AC_SUBST([GNULIB_GETTIMEOFDAY])
  dnl Assume POSIX behavior unless another module says otherwise.
  HAVE_GETTIMEOFDAY=1;       AC_SUBST([HAVE_GETTIMEOFDAY])
  HAVE_STRUCT_TIMEVAL=1;     AC_SUBST([HAVE_STRUCT_TIMEVAL])
  HAVE_SYS_TIME_H=1;         AC_SUBST([HAVE_SYS_TIME_H])
  REPLACE_GETTIMEOFDAY=0;    AC_SUBST([REPLACE_GETTIMEOFDAY])
])
Commit	Line	Data
49114fd4	1	# Configure a replacement for <sys/time.h>.
35428fb6	2	# serial 7
49114fd4	3
f0007cad	4	# Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc.
49114fd4 LC	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.
	8
	9	# Written by Paul Eggert and Martin Lambers.
	10
	11	AC_DEFUN([gl_HEADER_SYS_TIME_H],
	12	[
	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])
	17	])
	18
	19	AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],
	20	[
	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])
	25
	26	if test $ac_cv_header_sys_time_h != yes; then
	27	HAVE_SYS_TIME_H=0
	28	fi
	29
35428fb6 LC	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
49114fd4 LC	33	AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],
	34	[AC_COMPILE_IFELSE(
	35	[AC_LANG_PROGRAM(
	36	[[#if HAVE_SYS_TIME_H
	37	#include <sys/time.h>
	38	#endif
	39	#include <time.h>
35428fb6 LC	40	#if HAVE_WINSOCK2_H
	41	# include <winsock2.h>
	42	#endif
49114fd4 LC	43	]],
	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])])
	47	if test $gl_cv_sys_struct_timeval != yes; then
	48	HAVE_STRUCT_TIMEVAL=0
	49	fi
	50
	51	dnl Check for declarations of anything we want to poison if the
	52	dnl corresponding gnulib module is not in use.
	53	gl_WARN_ON_USE_PREPARE([[
	54	#if HAVE_SYS_TIME_H
	55	# include <sys/time.h>
	56	#endif
	57	#include <time.h>
	58	]], [gettimeofday])
	59	])
	60
	61	AC_DEFUN([gl_SYS_TIME_MODULE_INDICATOR],
	62	[
	63	dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
	64	AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
	65	gl_MODULE_INDICATOR_SET_VARIABLE([$1])
	66	dnl Define it also as a C macro, for the benefit of the unit tests.
	67	gl_MODULE_INDICATOR_FOR_TESTS([$1])
	68	])
	69
	70	AC_DEFUN([gl_HEADER_SYS_TIME_H_DEFAULTS],
	71	[
	72	GNULIB_GETTIMEOFDAY=0; AC_SUBST([GNULIB_GETTIMEOFDAY])
	73	dnl Assume POSIX behavior unless another module says otherwise.
	74	HAVE_GETTIMEOFDAY=1; AC_SUBST([HAVE_GETTIMEOFDAY])
	75	HAVE_STRUCT_TIMEVAL=1; AC_SUBST([HAVE_STRUCT_TIMEVAL])
	76	HAVE_SYS_TIME_H=1; AC_SUBST([HAVE_SYS_TIME_H])
	77	REPLACE_GETTIMEOFDAY=0; AC_SUBST([REPLACE_GETTIMEOFDAY])
	78	])