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-rw-r--r--gnulib-m4/year2038.m4132
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diff --git a/gnulib-m4/year2038.m4 b/gnulib-m4/year2038.m4
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--- a/gnulib-m4/year2038.m4
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-# year2038.m4 serial 8
-dnl Copyright (C) 2017-2022 Free Software Foundation, Inc.
-dnl This file is free software; the Free Software Foundation
-dnl gives unlimited permission to copy and/or distribute it,
-dnl with or without modifications, as long as this notice is preserved.
-
-dnl Attempt to ensure that 'time_t' can go past the year 2038 and that
-dnl the functions 'time', 'stat', etc. work with post-2038 timestamps.
-
-m4_ifdef([AC_SYS_YEAR2038], [
- AC_DEFUN([gl_YEAR2038_EARLY])
- AC_DEFUN([gl_YEAR2038], [AC_SYS_YEAR2038])
- AC_DEFUN([gl_YEAR2038_BODY], [_AC_SYS_YEAR2038])
-], [
-
-AC_DEFUN([gl_YEAR2038_EARLY],
-[
- AC_REQUIRE([AC_CANONICAL_HOST])
- case "$host_os" in
- mingw*)
- AC_DEFINE([__MINGW_USE_VC2005_COMPAT], [1],
- [For 64-bit time_t on 32-bit mingw.])
- ;;
- esac
-])
-
-# gl_YEAR2038_TEST_INCLUDES
-# -------------------------
-AC_DEFUN([gl_YEAR2038_TEST_INCLUDES],
-[[
- #include <time.h>
- /* Check that time_t can represent 2**32 - 1 correctly. */
- #define LARGE_TIME_T \\
- ((time_t) (((time_t) 1 << 30) - 1 + 3 * ((time_t) 1 << 30)))
- int verify_time_t_range[(LARGE_TIME_T / 65537 == 65535
- && LARGE_TIME_T % 65537 == 0)
- ? 1 : -1];
-]])
-
-# gl_YEAR2038_BODY(REQUIRE-YEAR2038-SAFE)
------------------------------------------
-AC_DEFUN([gl_YEAR2038_BODY],
-[
- AC_ARG_ENABLE([year2038],
- [ --disable-year2038 omit support for timestamps past the year 2038])
- AS_IF([test "$enable_year2038" != no],
- [
- dnl On many systems, time_t is already a 64-bit type.
- dnl On those systems where time_t is still 32-bit, it requires kernel
- dnl and libc support to make it 64-bit. For glibc 2.34 and later on Linux,
- dnl defining _TIME_BITS=64 and _FILE_OFFSET_BITS=64 is needed on x86 and ARM.
- dnl
- dnl On native Windows, the system include files define types __time32_t
- dnl and __time64_t. By default, time_t is an alias of
- dnl - __time32_t on 32-bit mingw,
- dnl - __time64_t on 64-bit mingw and on MSVC (since MSVC 8).
- dnl But when compiling with -D__MINGW_USE_VC2005_COMPAT, time_t is an
- dnl alias of __time64_t.
- dnl And when compiling with -D_USE_32BIT_TIME_T, time_t is an alias of
- dnl __time32_t.
- AC_CACHE_CHECK([for time_t past the year 2038], [gl_cv_type_time_t_y2038],
- [AC_COMPILE_IFELSE(
- [AC_LANG_SOURCE([gl_YEAR2038_TEST_INCLUDES])],
- [gl_cv_type_time_t_y2038=yes], [gl_cv_type_time_t_y2038=no])
- ])
- if test "$gl_cv_type_time_t_y2038" = no; then
- AC_CACHE_CHECK([for 64-bit time_t with _TIME_BITS=64],
- [gl_cv_type_time_t_bits_macro],
- [AC_COMPILE_IFELSE(
- [AC_LANG_SOURCE([[#define _TIME_BITS 64
- #define _FILE_OFFSET_BITS 64
- ]gl_YEAR2038_TEST_INCLUDES])],
- [gl_cv_type_time_t_bits_macro=yes],
- [gl_cv_type_time_t_bits_macro=no])
- ])
- if test "$gl_cv_type_time_t_bits_macro" = yes; then
- AC_DEFINE([_TIME_BITS], [64],
- [Number of bits in a timestamp, on hosts where this is settable.])
- dnl AC_SYS_LARGFILE also defines this; it's OK if we do too.
- AC_DEFINE([_FILE_OFFSET_BITS], [64],
- [Number of bits in a file offset, on hosts where this is settable.])
- gl_cv_type_time_t_y2038=yes
- fi
- fi
- if test $gl_cv_type_time_t_y2038 = no; then
- AC_COMPILE_IFELSE(
- [AC_LANG_SOURCE(
- [[#ifdef _USE_32BIT_TIME_T
- int ok;
- #else
- error fail
- #endif
- ]])],
- [AC_MSG_FAILURE(
- [The 'time_t' type stops working after January 2038.
- Remove _USE_32BIT_TIME_T from the compiler flags.])],
- [# If not cross-compiling and $1 says we should check,
- # and 'touch' works with a large timestamp, then evidently wider time_t
- # is desired and supported, so fail and ask the builder to fix the
- # problem. Otherwise, just warn the builder.
- m4_ifval([$1],
- [if test $cross_compiling = no \
- && TZ=UTC0 touch -t 210602070628.15 conftest.time 2>/dev/null; then
- case `TZ=UTC0 LC_ALL=C ls -l conftest.time 2>/dev/null` in
- *'Feb 7 2106'* | *'Feb 7 17:10'*)
- AC_MSG_FAILURE(
- [The 'time_t' type stops working after January 2038,
- and your system appears to support a wider 'time_t'.
- Try configuring with 'CC="${CC} -m64"'.
- To build with a 32-bit time_t anyway (not recommended),
- configure with '--disable-year2038'.]);;
- esac
- rm -f conftest.time
- fi])
- if test "$gl_warned_about_y2038" != yes; then
- AC_MSG_WARN(
- [The 'time_t' type stops working after January 2038,
- and this package needs a wider 'time_t' type
- if there is any way to access timestamps after that.
- Configure with 'CC="${CC} -m64"' perhaps?])
- gl_warned_about_y2038=yes
- fi
- ])
- fi])
-])
-
-AC_DEFUN([gl_YEAR2038],
-[
- gl_YEAR2038_BODY([require-year2038-safe])
-])
-
-]) # m4_ifndef AC_SYS_YEAR2038