[bpt/emacs.git] / m4 / time_h.m4

# Configure a more-standard replacement for <time.h>.

# Copyright (C) 2000-2001, 2003-2007, 2009-2011 Free Software Foundation, Inc.

# serial 5

# 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 Jim Meyering.

AC_DEFUN([gl_HEADER_TIME_H],
[
  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
  dnl once only, before all statements that occur in other macros.
  AC_REQUIRE([gl_HEADER_TIME_H_BODY])
])

AC_DEFUN([gl_HEADER_TIME_H_BODY],
[
  AC_REQUIRE([AC_C_RESTRICT])
  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
  gl_NEXT_HEADERS([time.h])
  AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])

  dnl Ensure the type pid_t gets defined.
  AC_REQUIRE([AC_TYPE_PID_T])
])

dnl Define HAVE_STRUCT_TIMESPEC if `struct timespec' is declared
dnl in time.h, sys/time.h, or pthread.h.

AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
[
  AC_CHECK_HEADERS_ONCE([sys/time.h])
  AC_CACHE_CHECK([for struct timespec in <time.h>],
    [gl_cv_sys_struct_timespec_in_time_h],
    [AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM(
          [[#include <time.h>
          ]],
          [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
       [gl_cv_sys_struct_timespec_in_time_h=yes],
       [gl_cv_sys_struct_timespec_in_time_h=no])])

  TIME_H_DEFINES_STRUCT_TIMESPEC=0
  SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
  PTHREAD_H_DEFINES_STRUCT_TIMESPEC=0
  if test $gl_cv_sys_struct_timespec_in_time_h = yes; then
    TIME_H_DEFINES_STRUCT_TIMESPEC=1
  else
    AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
      [gl_cv_sys_struct_timespec_in_sys_time_h],
      [AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM(
            [[#include <sys/time.h>
            ]],
            [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
         [gl_cv_sys_struct_timespec_in_sys_time_h=yes],
         [gl_cv_sys_struct_timespec_in_sys_time_h=no])])
    if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then
      SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
    else
      AC_CACHE_CHECK([for struct timespec in <pthread.h>],
        [gl_cv_sys_struct_timespec_in_pthread_h],
        [AC_COMPILE_IFELSE(
           [AC_LANG_PROGRAM(
              [[#include <pthread.h>
              ]],
              [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
           [gl_cv_sys_struct_timespec_in_pthread_h=yes],
           [gl_cv_sys_struct_timespec_in_pthread_h=no])])
      if test $gl_cv_sys_struct_timespec_in_pthread_h = yes; then
        PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1
      fi
    fi
  fi
  AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
  AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
  AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
])

AC_DEFUN([gl_TIME_MODULE_INDICATOR],
[
  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
  AC_REQUIRE([gl_HEADER_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_TIME_H_DEFAULTS],
[
  GNULIB_MKTIME=0;                       AC_SUBST([GNULIB_MKTIME])
  GNULIB_NANOSLEEP=0;                    AC_SUBST([GNULIB_NANOSLEEP])
  GNULIB_STRPTIME=0;                     AC_SUBST([GNULIB_STRPTIME])
  GNULIB_TIMEGM=0;                       AC_SUBST([GNULIB_TIMEGM])
  GNULIB_TIME_R=0;                       AC_SUBST([GNULIB_TIME_R])
  dnl Assume proper GNU behavior unless another module says otherwise.
  HAVE_DECL_LOCALTIME_R=1;               AC_SUBST([HAVE_DECL_LOCALTIME_R])
  HAVE_NANOSLEEP=1;                      AC_SUBST([HAVE_NANOSLEEP])
  HAVE_STRPTIME=1;                       AC_SUBST([HAVE_STRPTIME])
  HAVE_TIMEGM=1;                         AC_SUBST([HAVE_TIMEGM])
  dnl If another module says to replace or to not replace, do that.
  dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
  dnl this lets maintainers check for portability.
  REPLACE_LOCALTIME_R=GNULIB_PORTCHECK;  AC_SUBST([REPLACE_LOCALTIME_R])
  REPLACE_MKTIME=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_MKTIME])
  REPLACE_NANOSLEEP=GNULIB_PORTCHECK;    AC_SUBST([REPLACE_NANOSLEEP])
  REPLACE_TIMEGM=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_TIMEGM])
])
Commit	Line	Data
1fd182f0 PE	1	# Configure a more-standard replacement for <time.h>.
	2
	3	# Copyright (C) 2000-2001, 2003-2007, 2009-2011 Free Software Foundation, Inc.
	4
3f44249e	5	# serial 5
1fd182f0 PE	6
	7	# This file is free software; the Free Software Foundation
	8	# gives unlimited permission to copy and/or distribute it,
	9	# with or without modifications, as long as this notice is preserved.
	10
	11	# Written by Paul Eggert and Jim Meyering.
	12
	13	AC_DEFUN([gl_HEADER_TIME_H],
	14	[
	15	dnl Use AC_REQUIRE here, so that the default behavior below is expanded
	16	dnl once only, before all statements that occur in other macros.
	17	AC_REQUIRE([gl_HEADER_TIME_H_BODY])
	18	])
	19
	20	AC_DEFUN([gl_HEADER_TIME_H_BODY],
	21	[
	22	AC_REQUIRE([AC_C_RESTRICT])
	23	AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
b06b1098	24	gl_NEXT_HEADERS([time.h])
1fd182f0	25	AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
3f44249e PE	26
	27	dnl Ensure the type pid_t gets defined.
	28	AC_REQUIRE([AC_TYPE_PID_T])
1fd182f0 PE	29	])
	30
	31	dnl Define HAVE_STRUCT_TIMESPEC if `struct timespec' is declared
	32	dnl in time.h, sys/time.h, or pthread.h.
	33
	34	AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
	35	[
	36	AC_CHECK_HEADERS_ONCE([sys/time.h])
	37	AC_CACHE_CHECK([for struct timespec in <time.h>],
	38	[gl_cv_sys_struct_timespec_in_time_h],
	39	[AC_COMPILE_IFELSE(
	40	[AC_LANG_PROGRAM(
	41	[[#include <time.h>
	42	]],
	43	[[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
	44	[gl_cv_sys_struct_timespec_in_time_h=yes],
	45	[gl_cv_sys_struct_timespec_in_time_h=no])])
	46
	47	TIME_H_DEFINES_STRUCT_TIMESPEC=0
	48	SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
	49	PTHREAD_H_DEFINES_STRUCT_TIMESPEC=0
	50	if test $gl_cv_sys_struct_timespec_in_time_h = yes; then
	51	TIME_H_DEFINES_STRUCT_TIMESPEC=1
	52	else
	53	AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
	54	[gl_cv_sys_struct_timespec_in_sys_time_h],
	55	[AC_COMPILE_IFELSE(
	56	[AC_LANG_PROGRAM(
	57	[[#include <sys/time.h>
	58	]],
	59	[[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
	60	[gl_cv_sys_struct_timespec_in_sys_time_h=yes],
	61	[gl_cv_sys_struct_timespec_in_sys_time_h=no])])
	62	if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then
	63	SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
	64	else
	65	AC_CACHE_CHECK([for struct timespec in <pthread.h>],
	66	[gl_cv_sys_struct_timespec_in_pthread_h],
	67	[AC_COMPILE_IFELSE(
	68	[AC_LANG_PROGRAM(
	69	[[#include <pthread.h>
	70	]],
	71	[[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
	72	[gl_cv_sys_struct_timespec_in_pthread_h=yes],
	73	[gl_cv_sys_struct_timespec_in_pthread_h=no])])
	74	if test $gl_cv_sys_struct_timespec_in_pthread_h = yes; then
	75	PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1
	76	fi
	77	fi
	78	fi
	79	AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
	80	AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
	81	AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
	82	])
	83
	84	AC_DEFUN([gl_TIME_MODULE_INDICATOR],
	85	[
	86	dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
	87	AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
	88	gl_MODULE_INDICATOR_SET_VARIABLE([$1])
	89	dnl Define it also as a C macro, for the benefit of the unit tests.
	90	gl_MODULE_INDICATOR_FOR_TESTS([$1])
	91	])
	92
93	AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
94	[
95	GNULIB_MKTIME=0; AC_SUBST([GNULIB_MKTIME])
96	GNULIB_NANOSLEEP=0; AC_SUBST([GNULIB_NANOSLEEP])
97	GNULIB_STRPTIME=0; AC_SUBST([GNULIB_STRPTIME])
98	GNULIB_TIMEGM=0; AC_SUBST([GNULIB_TIMEGM])
99	GNULIB_TIME_R=0; AC_SUBST([GNULIB_TIME_R])
100	dnl Assume proper GNU behavior unless another module says otherwise.
101	HAVE_DECL_LOCALTIME_R=1; AC_SUBST([HAVE_DECL_LOCALTIME_R])
102	HAVE_NANOSLEEP=1; AC_SUBST([HAVE_NANOSLEEP])
103	HAVE_STRPTIME=1; AC_SUBST([HAVE_STRPTIME])
104	HAVE_TIMEGM=1; AC_SUBST([HAVE_TIMEGM])
105	dnl If another module says to replace or to not replace, do that.
106	dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
107	dnl this lets maintainers check for portability.
108	REPLACE_LOCALTIME_R=GNULIB_PORTCHECK; AC_SUBST([REPLACE_LOCALTIME_R])
109	REPLACE_MKTIME=GNULIB_PORTCHECK; AC_SUBST([REPLACE_MKTIME])
110	REPLACE_NANOSLEEP=GNULIB_PORTCHECK; AC_SUBST([REPLACE_NANOSLEEP])
111	REPLACE_TIMEGM=GNULIB_PORTCHECK; AC_SUBST([REPLACE_TIMEGM])
112	])