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Diffstat (limited to 'm4/year2038.m4')
| -rw-r--r-- | m4/year2038.m4 | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/m4/year2038.m4 b/m4/year2038.m4 deleted file mode 100644 index 2e4427e6f..000000000 --- a/m4/year2038.m4 +++ /dev/null @@ -1,132 +0,0 @@ -# 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 |