time.h

Go to the documentation of this file.

/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
/* A more-standard <time.h>.

   Copyright (C) 2007-2016 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.  */

#if __GNUC__ >= 3
#pragma GCC system_header
#endif


/* Don't get in the way of glibc when it includes time.h merely to
   declare a few standard symbols, rather than to declare all the
   symbols.  (However, skip this for MinGW as it treats __need_time_t
   incompatibly.)  Also, Solaris 8 <time.h> eventually includes itself
   recursively; if that is happening, just include the system <time.h>
   without adding our own declarations.  */
#if (((defined __need_time_t || defined __need_clock_t \
       || defined __need_timespec)                     \
      && !defined __MINGW32__)                         \
     || defined _GL_TIME_H)

# include_next <time.h>

#else

# define _GL_TIME_H

# include_next <time.h>

/* NetBSD 5.0 mis-defines NULL.  */
# include <stddef.h>

/* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
#ifndef _GL_CXXDEFS_H
#define _GL_CXXDEFS_H

/* Begin/end the GNULIB_NAMESPACE namespace.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_BEGIN_NAMESPACE namespace GNULIB_NAMESPACE {
# define _GL_END_NAMESPACE }
#else
# define _GL_BEGIN_NAMESPACE
# define _GL_END_NAMESPACE
#endif

/* The three most frequent use cases of these macros are:

   * For providing a substitute for a function that is missing on some
     platforms, but is declared and works fine on the platforms on which
     it exists:

       #if @GNULIB_FOO@
       # if !@HAVE_FOO@
       _GL_FUNCDECL_SYS (foo, ...);
       # endif
       _GL_CXXALIAS_SYS (foo, ...);
       _GL_CXXALIASWARN (foo);
       #elif defined GNULIB_POSIXCHECK
       ...
       #endif

   * For providing a replacement for a function that exists on all platforms,
     but is broken/insufficient and needs to be replaced on some platforms:

       #if @GNULIB_FOO@
       # if @REPLACE_FOO@
       #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
       #   undef foo
       #   define foo rpl_foo
       #  endif
       _GL_FUNCDECL_RPL (foo, ...);
       _GL_CXXALIAS_RPL (foo, ...);
       # else
       _GL_CXXALIAS_SYS (foo, ...);
       # endif
       _GL_CXXALIASWARN (foo);
       #elif defined GNULIB_POSIXCHECK
       ...
       #endif

   * For providing a replacement for a function that exists on some platforms
     but is broken/insufficient and needs to be replaced on some of them and
     is additionally either missing or undeclared on some other platforms:

       #if @GNULIB_FOO@
       # if @REPLACE_FOO@
       #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
       #   undef foo
       #   define foo rpl_foo
       #  endif
       _GL_FUNCDECL_RPL (foo, ...);
       _GL_CXXALIAS_RPL (foo, ...);
       # else
       #  if !@HAVE_FOO@   or   if !@HAVE_DECL_FOO@
       _GL_FUNCDECL_SYS (foo, ...);
       #  endif
       _GL_CXXALIAS_SYS (foo, ...);
       # endif
       _GL_CXXALIASWARN (foo);
       #elif defined GNULIB_POSIXCHECK
       ...
       #endif
*/

/* _GL_EXTERN_C declaration;
   performs the declaration with C linkage.  */
#if defined __cplusplus
# define _GL_EXTERN_C extern "C"
#else
# define _GL_EXTERN_C extern
#endif

/* _GL_FUNCDECL_RPL (func, rettype, parameters_and_attributes);
   declares a replacement function, named rpl_func, with the given prototype,
   consisting of return type, parameters, and attributes.
   Example:
     _GL_FUNCDECL_RPL (open, int, (const char *filename, int flags, ...)
                                  _GL_ARG_NONNULL ((1)));
 */
#define _GL_FUNCDECL_RPL(func,rettype,parameters_and_attributes) \
  _GL_FUNCDECL_RPL_1 (rpl_##func, rettype, parameters_and_attributes)
#define _GL_FUNCDECL_RPL_1(rpl_func,rettype,parameters_and_attributes) \
  _GL_EXTERN_C rettype rpl_func parameters_and_attributes

/* _GL_FUNCDECL_SYS (func, rettype, parameters_and_attributes);
   declares the system function, named func, with the given prototype,
   consisting of return type, parameters, and attributes.
   Example:
     _GL_FUNCDECL_SYS (open, int, (const char *filename, int flags, ...)
                                  _GL_ARG_NONNULL ((1)));
 */
#define _GL_FUNCDECL_SYS(func,rettype,parameters_and_attributes) \
  _GL_EXTERN_C rettype func parameters_and_attributes

/* _GL_CXXALIAS_RPL (func, rettype, parameters);
   declares a C++ alias called GNULIB_NAMESPACE::func
   that redirects to rpl_func, if GNULIB_NAMESPACE is defined.
   Example:
     _GL_CXXALIAS_RPL (open, int, (const char *filename, int flags, ...));

   Wrapping rpl_func in an object with an inline conversion operator
   avoids a reference to rpl_func unless GNULIB_NAMESPACE::func is
   actually used in the program.  */
#define _GL_CXXALIAS_RPL(func,rettype,parameters) \
  _GL_CXXALIAS_RPL_1 (func, rpl_##func, rettype, parameters)
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \
    namespace GNULIB_NAMESPACE                                \
    {                                                         \
      static const struct _gl_ ## func ## _wrapper            \
      {                                                       \
        typedef rettype (*type) parameters;                   \
        inline type rpl () const { return ::rpl_func; }       \
        inline operator type () const  { return rpl (); }     \
      } func = {};                                            \
    }                                                         \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#else
# define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIAS_RPL_CAST_1 (func, rpl_func, rettype, parameters);
   is like  _GL_CXXALIAS_RPL_1 (func, rpl_func, rettype, parameters);
   except that the C function rpl_func may have a slightly different
   declaration.  A cast is used to silence the "invalid conversion" error
   that would otherwise occur.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \
    namespace GNULIB_NAMESPACE                                     \
    {                                                              \
      static const struct _gl_ ## func ## _wrapper                 \
      {                                                            \
        typedef rettype (*type) parameters;                        \
        inline type rpl () const                                   \
        { return reinterpret_cast<type>(::rpl_func); }             \
        inline operator type () const { return rpl (); }           \
      } func = {};                                                 \
    }                                                              \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#else
# define _GL_CXXALIAS_RPL_CAST_1(func,rpl_func,rettype,parameters) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIAS_SYS (func, rettype, parameters);
   declares a C++ alias called GNULIB_NAMESPACE::func
   that redirects to the system provided function func, if GNULIB_NAMESPACE
   is defined.
   Example:
     _GL_CXXALIAS_SYS (open, int, (const char *filename, int flags, ...));

   Wrapping func in an object with an inline conversion operator
   avoids a reference to func unless GNULIB_NAMESPACE::func is
   actually used in the program.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_CXXALIAS_SYS(func,rettype,parameters)            \
    namespace GNULIB_NAMESPACE                                \
    {                                                         \
      static const struct _gl_ ## func ## _wrapper            \
      {                                                       \
        typedef rettype (*type) parameters;                   \
        inline type rpl () const { return ::func; }           \
        inline operator type () const { return rpl (); }      \
      } func = {};                                            \
    }                                              \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#else
# define _GL_CXXALIAS_SYS(func,rettype,parameters) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIAS_SYS_CAST (func, rettype, parameters);
   is like  _GL_CXXALIAS_SYS (func, rettype, parameters);
   except that the C function func may have a slightly different declaration.
   A cast is used to silence the "invalid conversion" error that would
   otherwise occur.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \
    namespace GNULIB_NAMESPACE                          \
    {                                                   \
      static const struct _gl_ ## func ## _wrapper      \
      {                                                 \
        typedef rettype (*type) parameters;             \
        inline type rpl () const                        \
        { return reinterpret_cast<type>(::func); }      \
        inline operator type () const { return rpl (); }\
      } func = {};                                      \
    }                                                   \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#else
# define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIAS_SYS_CAST2 (func, rettype, parameters, rettype2, parameters2);
   is like  _GL_CXXALIAS_SYS (func, rettype, parameters);
   except that the C function is picked among a set of overloaded functions,
   namely the one with rettype2 and parameters2.  Two consecutive casts
   are used to silence the "cannot find a match" and "invalid conversion"
   errors that would otherwise occur.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
  /* The outer cast must be a reinterpret_cast.
     The inner cast: When the function is defined as a set of overloaded
     functions, it works as a static_cast<>, choosing the designated variant.
     When the function is defined as a single variant, it works as a
     reinterpret_cast<>. The parenthesized cast syntax works both ways.  */
# define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \
    namespace GNULIB_NAMESPACE                                                \
    {                                                                         \
      static const struct _gl_ ## func ## _wrapper                            \
      {                                                                       \
        typedef rettype (*type) parameters;                                   \
                                                                              \
        inline type rpl () const                                              \
        { return reinterpret_cast<type>((rettype2 (*) parameters2)(::func)); }\
                                                                              \
        inline operator type () const { return rpl (); }                      \
      } func = {};                                                            \
    }                                                                         \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#else
# define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIASWARN (func);
   causes a warning to be emitted when ::func is used but not when
   GNULIB_NAMESPACE::func is used.  func must be defined without overloaded
   variants.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_CXXALIASWARN(func) \
   _GL_CXXALIASWARN_1 (func, GNULIB_NAMESPACE)
# define _GL_CXXALIASWARN_1(func,namespace) \
   _GL_CXXALIASWARN_2 (func, namespace)
/* To work around GCC bug <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>,
   we enable the warning only when not optimizing.  */
# if !__OPTIMIZE__
#  define _GL_CXXALIASWARN_2(func,namespace) \
    _GL_WARN_ON_USE (func, \
                     "The symbol ::" #func " refers to the system function. " \
                     "Use " #namespace "::" #func " instead.")
# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
#  define _GL_CXXALIASWARN_2(func,namespace) \
     extern __typeof__ (func) func
# else
#  define _GL_CXXALIASWARN_2(func,namespace) \
     _GL_EXTERN_C int _gl_cxxalias_dummy
# endif
#else
# define _GL_CXXALIASWARN(func) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

/* _GL_CXXALIASWARN1 (func, rettype, parameters_and_attributes);
   causes a warning to be emitted when the given overloaded variant of ::func
   is used but not when GNULIB_NAMESPACE::func is used.  */
#if defined __cplusplus && defined GNULIB_NAMESPACE
# define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \
   _GL_CXXALIASWARN1_1 (func, rettype, parameters_and_attributes, \
                        GNULIB_NAMESPACE)
# define _GL_CXXALIASWARN1_1(func,rettype,parameters_and_attributes,namespace) \
   _GL_CXXALIASWARN1_2 (func, rettype, parameters_and_attributes, namespace)
/* To work around GCC bug <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881>,
   we enable the warning only when not optimizing.  */
# if !__OPTIMIZE__
#  define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
    _GL_WARN_ON_USE_CXX (func, rettype, parameters_and_attributes, \
                         "The symbol ::" #func " refers to the system function. " \
                         "Use " #namespace "::" #func " instead.")
# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
#  define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
     extern __typeof__ (func) func
# else
#  define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
     _GL_EXTERN_C int _gl_cxxalias_dummy
# endif
#else
# define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \
    _GL_EXTERN_C int _gl_cxxalias_dummy
#endif

#endif /* _GL_CXXDEFS_H */

/* The definition of _GL_ARG_NONNULL is copied here.  */
/* _GL_ARG_NONNULL((n,...,m)) tells the compiler and static analyzer tools
   that the values passed as arguments n, ..., m must be non-NULL pointers.
   n = 1 stands for the first argument, n = 2 for the second argument etc.  */
#ifndef _GL_ARG_NONNULL
# if (__GNUC__ == 3 && __GNUC_MINOR__ >= 3) || __GNUC__ > 3
#  define _GL_ARG_NONNULL(params) __attribute__ ((__nonnull__ params))
# else
#  define _GL_ARG_NONNULL(params)
# endif
#endif

/* The definition of _GL_WARN_ON_USE is copied here.  */
#ifndef _GL_WARN_ON_USE

# if 4 < __GNUC__ || (__GNUC__ == 4 && 3 <= __GNUC_MINOR__)
/* A compiler attribute is available in gcc versions 4.3.0 and later.  */
#  define _GL_WARN_ON_USE(function, message) \
extern __typeof__ (function) function __attribute__ ((__warning__ (message)))
# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
/* Verify the existence of the function.  */
#  define _GL_WARN_ON_USE(function, message) \
extern __typeof__ (function) function
# else /* Unsupported.  */
#  define _GL_WARN_ON_USE(function, message) \
_GL_WARN_EXTERN_C int _gl_warn_on_use
# endif
#endif

/* _GL_WARN_ON_USE_CXX (function, rettype, parameters_and_attributes, "string")
   is like _GL_WARN_ON_USE (function, "string"), except that the function is
   declared with the given prototype, consisting of return type, parameters,
   and attributes.
   This variant is useful for overloaded functions in C++. _GL_WARN_ON_USE does
   not work in this case.  */
#ifndef _GL_WARN_ON_USE_CXX
# if 4 < __GNUC__ || (__GNUC__ == 4 && 3 <= __GNUC_MINOR__)
#  define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \
extern rettype function parameters_and_attributes \
     __attribute__ ((__warning__ (msg)))
# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
/* Verify the existence of the function.  */
#  define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \
extern rettype function parameters_and_attributes
# else /* Unsupported.  */
#  define _GL_WARN_ON_USE_CXX(function,rettype,parameters_and_attributes,msg) \
_GL_WARN_EXTERN_C int _gl_warn_on_use
# endif
#endif

/* _GL_WARN_EXTERN_C declaration;
   performs the declaration with C linkage.  */
#ifndef _GL_WARN_EXTERN_C
# if defined __cplusplus
#  define _GL_WARN_EXTERN_C extern "C"
# else
#  define _GL_WARN_EXTERN_C extern
# endif
#endif

/* Some systems don't define struct timespec (e.g., AIX 4.1, Ultrix 4.3).
   Or they define it with the wrong member names or define it in <sys/time.h>
   (e.g., FreeBSD circa 1997).  Stock Mingw prior to 3.0 does not define it,
   but the pthreads-win32 library defines it in <pthread.h>.  */
# if ! 1
#  if 0
#   include <sys/time.h>
#  elif 0
#   include <pthread.h>
#  elif 0
#   include <unistd.h>
#  else

#   ifdef __cplusplus
extern "C" {
#   endif

#   if !GNULIB_defined_struct_timespec
#    undef timespec
#    define timespec rpl_timespec
struct timespec
{
  time_t tv_sec;
  long int tv_nsec;
};
#    define GNULIB_defined_struct_timespec 1
#   endif

#   ifdef __cplusplus
}
#   endif

#  endif
# endif

# if !GNULIB_defined_struct_time_t_must_be_integral
/* Per http://austingroupbugs.net/view.php?id=327, POSIX requires
   time_t to be an integer type, even though C99 permits floating
   point.  We don't know of any implementation that uses floating
   point, and it is much easier to write code that doesn't have to
   worry about that corner case, so we force the issue.  */
struct __time_t_must_be_integral {
  unsigned int __floating_time_t_unsupported : (time_t) 1;
};
#  define GNULIB_defined_struct_time_t_must_be_integral 1
# endif

/* Sleep for at least RQTP seconds unless interrupted,  If interrupted,
   return -1 and store the remaining time into RMTP.  See
   <http://www.opengroup.org/susv3xsh/nanosleep.html>.  */
# if 0
#  if GNULIB_PORTCHECK
#   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#    define nanosleep rpl_nanosleep
#   endif
_GL_FUNCDECL_RPL (nanosleep, int,
                  (struct timespec const *__rqtp, struct timespec *__rmtp)
                  _GL_ARG_NONNULL ((1)));
_GL_CXXALIAS_RPL (nanosleep, int,
                  (struct timespec const *__rqtp, struct timespec *__rmtp));
#  else
#   if ! 1
_GL_FUNCDECL_SYS (nanosleep, int,
                  (struct timespec const *__rqtp, struct timespec *__rmtp)
                  _GL_ARG_NONNULL ((1)));
#   endif
_GL_CXXALIAS_SYS (nanosleep, int,
                  (struct timespec const *__rqtp, struct timespec *__rmtp));
#  endif
_GL_CXXALIASWARN (nanosleep);
# endif

/* Return the 'time_t' representation of TP and normalize TP.  */
# if 0
#  if GNULIB_PORTCHECK
#   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#    define mktime rpl_mktime
#   endif
_GL_FUNCDECL_RPL (mktime, time_t, (struct tm *__tp) _GL_ARG_NONNULL ((1)));
_GL_CXXALIAS_RPL (mktime, time_t, (struct tm *__tp));
#  else
_GL_CXXALIAS_SYS (mktime, time_t, (struct tm *__tp));
#  endif
_GL_CXXALIASWARN (mktime);
# endif

/* Convert TIMER to RESULT, assuming local time and UTC respectively.  See
   <http://www.opengroup.org/susv3xsh/localtime_r.html> and
   <http://www.opengroup.org/susv3xsh/gmtime_r.html>.  */
# if 0
#  if GNULIB_PORTCHECK
#   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#    undef localtime_r
#    define localtime_r rpl_localtime_r
#   endif
_GL_FUNCDECL_RPL (localtime_r, struct tm *, (time_t const *restrict __timer,
                                             struct tm *restrict __result)
                                            _GL_ARG_NONNULL ((1, 2)));
_GL_CXXALIAS_RPL (localtime_r, struct tm *, (time_t const *restrict __timer,
                                             struct tm *restrict __result));
#  else
#   if ! 1
_GL_FUNCDECL_SYS (localtime_r, struct tm *, (time_t const *restrict __timer,
                                             struct tm *restrict __result)
                                            _GL_ARG_NONNULL ((1, 2)));
#   endif
_GL_CXXALIAS_SYS (localtime_r, struct tm *, (time_t const *restrict __timer,
                                             struct tm *restrict __result));
#  endif
#  if 1
_GL_CXXALIASWARN (localtime_r);
#  endif
#  if GNULIB_PORTCHECK
#   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#    undef gmtime_r
#    define gmtime_r rpl_gmtime_r
#   endif
_GL_FUNCDECL_RPL (gmtime_r, struct tm *, (time_t const *restrict __timer,
                                          struct tm *restrict __result)
                                         _GL_ARG_NONNULL ((1, 2)));
_GL_CXXALIAS_RPL (gmtime_r, struct tm *, (time_t const *restrict __timer,
                                          struct tm *restrict __result));
#  else
#   if ! 1
_GL_FUNCDECL_SYS (gmtime_r, struct tm *, (time_t const *restrict __timer,
                                          struct tm *restrict __result)
                                         _GL_ARG_NONNULL ((1, 2)));
#   endif
_GL_CXXALIAS_SYS (gmtime_r, struct tm *, (time_t const *restrict __timer,
                                          struct tm *restrict __result));
#  endif
#  if 1
_GL_CXXALIASWARN (gmtime_r);
#  endif
# endif

/* Convert TIMER to RESULT, assuming local time and UTC respectively.  See
   <http://www.opengroup.org/susv3xsh/localtime.html> and
   <http://www.opengroup.org/susv3xsh/gmtime.html>.  */
# if 1
#  if 0
#   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#    undef localtime
#    define localtime rpl_localtime
#   endif
_GL_FUNCDECL_RPL (localtime, struct tm *, (time_t const *__timer)
                                  _GL_ARG_NONNULL ((1)));
_GL_CXXALIAS_RPL (localtime, struct tm *, (time_t const *__timer));
#  else
_GL_CXXALIAS_SYS (localtime, struct tm *, (time_t const *__timer));
#  endif
_GL_CXXALIASWARN (localtime);
# endif

# if 1
#  if 0
#   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#    undef gmtime
#    define gmtime rpl_gmtime
#   endif
_GL_FUNCDECL_RPL (gmtime, struct tm *, (time_t const *__timer)
                                       _GL_ARG_NONNULL ((1)));
_GL_CXXALIAS_RPL (gmtime, struct tm *, (time_t const *__timer));
#  else
_GL_CXXALIAS_SYS (gmtime, struct tm *, (time_t const *__timer));
#  endif
_GL_CXXALIASWARN (gmtime);
# endif

/* Parse BUF as a time stamp, assuming FORMAT specifies its layout, and store
   the resulting broken-down time into TM.  See
   <http://www.opengroup.org/susv3xsh/strptime.html>.  */
# if 0
#  if ! 1
_GL_FUNCDECL_SYS (strptime, char *, (char const *restrict __buf,
                                     char const *restrict __format,
                                     struct tm *restrict __tm)
                                    _GL_ARG_NONNULL ((1, 2, 3)));
#  endif
_GL_CXXALIAS_SYS (strptime, char *, (char const *restrict __buf,
                                     char const *restrict __format,
                                     struct tm *restrict __tm));
_GL_CXXALIASWARN (strptime);
# endif

# if defined _GNU_SOURCE && 0 && ! 0
typedef struct tm_zone *timezone_t;
_GL_FUNCDECL_SYS (tzalloc, timezone_t, (char const *__name));
_GL_CXXALIAS_SYS (tzalloc, timezone_t, (char const *__name));
_GL_FUNCDECL_SYS (tzfree, void, (timezone_t __tz));
_GL_CXXALIAS_SYS (tzfree, void, (timezone_t __tz));
_GL_FUNCDECL_SYS (localtime_rz, struct tm *,
                  (timezone_t __tz, time_t const *restrict __timer,
                   struct tm *restrict __result) _GL_ARG_NONNULL ((2, 3)));
_GL_CXXALIAS_SYS (localtime_rz, struct tm *,
                  (timezone_t __tz, time_t const *restrict __timer,
                   struct tm *restrict __result));
_GL_FUNCDECL_SYS (mktime_z, time_t,
                  (timezone_t __tz, struct tm *restrict __result)
                  _GL_ARG_NONNULL ((2)));
_GL_CXXALIAS_SYS (mktime_z, time_t,
                  (timezone_t __tz, struct tm *restrict __result));
# endif

/* Convert TM to a time_t value, assuming UTC.  */
# if 0
#  if GNULIB_PORTCHECK
#   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#    undef timegm
#    define timegm rpl_timegm
#   endif
_GL_FUNCDECL_RPL (timegm, time_t, (struct tm *__tm) _GL_ARG_NONNULL ((1)));
_GL_CXXALIAS_RPL (timegm, time_t, (struct tm *__tm));
#  else
#   if ! 1
_GL_FUNCDECL_SYS (timegm, time_t, (struct tm *__tm) _GL_ARG_NONNULL ((1)));
#   endif
_GL_CXXALIAS_SYS (timegm, time_t, (struct tm *__tm));
#  endif
_GL_CXXALIASWARN (timegm);
# endif

/* Encourage applications to avoid unsafe functions that can overrun
   buffers when given outlandish struct tm values.  Portable
   applications should use strftime (or even sprintf) instead.  */
# if defined GNULIB_POSIXCHECK
#  undef asctime
_GL_WARN_ON_USE (asctime, "asctime can overrun buffers in some cases - "
                 "better use strftime (or even sprintf) instead");
# endif
# if defined GNULIB_POSIXCHECK
#  undef asctime_r
_GL_WARN_ON_USE (asctime, "asctime_r can overrun buffers in some cases - "
                 "better use strftime (or even sprintf) instead");
# endif
# if defined GNULIB_POSIXCHECK
#  undef ctime
_GL_WARN_ON_USE (asctime, "ctime can overrun buffers in some cases - "
                 "better use strftime (or even sprintf) instead");
# endif
# if defined GNULIB_POSIXCHECK
#  undef ctime_r
_GL_WARN_ON_USE (asctime, "ctime_r can overrun buffers in some cases - "
                 "better use strftime (or even sprintf) instead");
# endif

#endif