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

# Copyright (C) 2000-2001, 2003-2007, 2009-2018 Free Software Foundation, Inc.

# serial 11

# 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 Check whether 'struct timespec' is declared

dnl in time.h, sys/time.h, pthread.h, or unistd.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

  UNISTD_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

      else

        AC_CACHE_CHECK([for struct timespec in <unistd.h>],

          [gl_cv_sys_struct_timespec_in_unistd_h],

          [AC_COMPILE_IFELSE(

             [AC_LANG_PROGRAM(

                [[#include <unistd.h>

                ]],

                [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],

             [gl_cv_sys_struct_timespec_in_unistd_h=yes],

             [gl_cv_sys_struct_timespec_in_unistd_h=no])])

        if test $gl_cv_sys_struct_timespec_in_unistd_h = yes; then

          UNISTD_H_DEFINES_STRUCT_TIMESPEC=1

        fi

      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_SUBST([UNISTD_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_CTIME=0;                        AC_SUBST([GNULIB_CTIME])

  GNULIB_MKTIME=0;                       AC_SUBST([GNULIB_MKTIME])

  GNULIB_LOCALTIME=0;                    AC_SUBST([GNULIB_LOCALTIME])

  GNULIB_NANOSLEEP=0;                    AC_SUBST([GNULIB_NANOSLEEP])

  GNULIB_STRFTIME=0;                     AC_SUBST([GNULIB_STRFTIME])

  GNULIB_STRPTIME=0;                     AC_SUBST([GNULIB_STRPTIME])

  GNULIB_TIMEGM=0;                       AC_SUBST([GNULIB_TIMEGM])

  GNULIB_TIME_R=0;                       AC_SUBST([GNULIB_TIME_R])

  GNULIB_TIME_RZ=0;                      AC_SUBST([GNULIB_TIME_RZ])

  GNULIB_TZSET=0;                        AC_SUBST([GNULIB_TZSET])

  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])

  HAVE_TZSET=1;                          AC_SUBST([HAVE_TZSET])

  dnl Even GNU libc does not have timezone_t yet.

  HAVE_TIMEZONE_T=0;                     AC_SUBST([HAVE_TIMEZONE_T])

  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_CTIME=GNULIB_PORTCHECK;        AC_SUBST([REPLACE_CTIME])

  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_STRFTIME=GNULIB_PORTCHECK;     AC_SUBST([REPLACE_STRFTIME])

  REPLACE_TIMEGM=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_TIMEGM])

  REPLACE_TZSET=GNULIB_PORTCHECK;        AC_SUBST([REPLACE_TZSET])

  dnl Hack so that the time module doesn't depend on the sys_time module.

  dnl First, default GNULIB_GETTIMEOFDAY to 0 if sys_time is absent.

  : ${GNULIB_GETTIMEOFDAY=0};            AC_SUBST([GNULIB_GETTIMEOFDAY])

  dnl Second, it's OK to not use GNULIB_PORTCHECK for REPLACE_GMTIME

  dnl and REPLACE_LOCALTIME, as portability to Solaris 2.6 and earlier

  dnl is no longer a big deal.

  REPLACE_GMTIME=0;                      AC_SUBST([REPLACE_GMTIME])

  REPLACE_LOCALTIME=0;                   AC_SUBST([REPLACE_LOCALTIME])

])