diff options
Diffstat (limited to 'gnulib-m4/largefile.m4')
| -rw-r--r-- | gnulib-m4/largefile.m4 | 351 |
1 files changed, 262 insertions, 89 deletions
diff --git a/gnulib-m4/largefile.m4 b/gnulib-m4/largefile.m4 index ec9677c4..cbe9bc1f 100644 --- a/gnulib-m4/largefile.m4 +++ b/gnulib-m4/largefile.m4 @@ -1,7 +1,7 @@ # Enable large files on systems where this is not the default. # Enable support for files on Linux file systems with 64-bit inode numbers. -# Copyright 1992-1996, 1998-2022 Free Software Foundation, Inc. +# Copyright 1992-1996, 1998-2024 Free Software Foundation, Inc. # 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. @@ -10,10 +10,9 @@ # It does not set _LARGEFILE_SOURCE=1 on HP-UX/ia64 32-bit, although this # setting of _LARGEFILE_SOURCE is needed so that <stdio.h> declares fseeko # and ftello in C++ mode as well. -# Fixed in Autoconf 2.72, which has AC_SYS_YEAR2038. +# This problem occurs in Autoconf 2.71 and earlier, which lack AC_SYS_YEAR2038. AC_DEFUN([gl_SET_LARGEFILE_SOURCE], -[ - m4_ifndef([AC_SYS_YEAR2038], [ + m4_ifndef([AC_SYS_YEAR2038], [[ AC_REQUIRE([AC_CANONICAL_HOST]) AC_FUNC_FSEEKO case "$host_os" in @@ -22,58 +21,264 @@ AC_DEFUN([gl_SET_LARGEFILE_SOURCE], [Define to 1 to make fseeko visible on some hosts (e.g. glibc 2.2).]) ;; esac - ]) + ]]) +) + +m4_ifndef([AC_SYS_YEAR2038_RECOMMENDED], [ +# Support AC_SYS_YEAR2038_RECOMMENDED and related macros, even if +# Autoconf 2.71 or earlier. This code is taken from Autoconf master. + +# _AC_SYS_YEAR2038_TEST_CODE +# -------------------------- +# C code used to probe for time_t that can represent time points more +# than 2**31 - 1 seconds after the epoch. With the usual Unix epoch, +# these correspond to dates after 2038-01-18 22:14:07 +0000 (Gregorian), +# hence the name. +AC_DEFUN([_AC_SYS_YEAR2038_TEST_CODE], +[[ + #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]; +]]) + +# _AC_SYS_YEAR2038_OPTIONS +# ------------------------ +# List of known ways to enable support for large time_t. If you change +# this list you probably also need to change the AS_CASE at the end of +# _AC_SYS_YEAR2038_PROBE. +m4_define([_AC_SYS_YEAR2038_OPTIONS], m4_normalize( + ["none needed"] dnl 64-bit and newer 32-bit Unix + ["-D_TIME_BITS=64"] dnl glibc 2.34 with some 32-bit ABIs + ["-D__MINGW_USE_VC2005_COMPAT"] dnl 32-bit MinGW + ["-U_USE_32_BIT_TIME_T -D__MINGW_USE_VC2005_COMPAT"] + dnl 32-bit MinGW (misconfiguration) +)) + +# _AC_SYS_YEAR2038_PROBE +# ---------------------- +# Subroutine of AC_SYS_YEAR2038. Probe for time_t that can represent +# time points more than 2**31 - 1 seconds after the epoch (dates after +# 2038-01-18, see above) and set the cache variable ac_cv_sys_year2038_opts +# to one of the values in the _AC_SYS_YEAR2038_OPTIONS list, or to +# "support not detected" if none of them worked. Then, set compilation +# options and #defines as necessary to enable large time_t support. +# +# Note that we do not test whether mktime, localtime, etc. handle +# large values of time_t correctly, as that would require use of +# AC_TRY_RUN. Note also that some systems only support large time_t +# together with large off_t. +# +# If you change this macro you may also need to change +# _AC_SYS_YEAR2038_OPTIONS. +AC_DEFUN([_AC_SYS_YEAR2038_PROBE], +[AC_CACHE_CHECK([for $CC option for timestamps after 2038], + [ac_cv_sys_year2038_opts], + [ac_save_CPPFLAGS="$CPPFLAGS" + ac_opt_found=no + for ac_opt in _AC_SYS_YEAR2038_OPTIONS; do + AS_IF([test x"$ac_opt" != x"none needed"], + [CPPFLAGS="$ac_save_CPPFLAGS $ac_opt"]) + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([_AC_SYS_YEAR2038_TEST_CODE])], + [ac_cv_sys_year2038_opts="$ac_opt" + ac_opt_found=yes]) + test $ac_opt_found = no || break + done + CPPFLAGS="$ac_save_CPPFLAGS" + test $ac_opt_found = yes || ac_cv_sys_year2038_opts="support not detected"]) + +ac_have_year2038=yes +AS_CASE([$ac_cv_sys_year2038_opts], + ["none needed"], [], + ["support not detected"], + [ac_have_year2038=no], + + ["-D_TIME_BITS=64"], + [AC_DEFINE([_TIME_BITS], [64], + [Number of bits in time_t, on hosts where this is settable.])], + + ["-D__MINGW_USE_VC2005_COMPAT"], + [AC_DEFINE([__MINGW_USE_VC2005_COMPAT], [1], + [Define to 1 on platforms where this makes time_t a 64-bit type.])], + + ["-U_USE_32_BIT_TIME_T"*], + [AC_MSG_FAILURE(m4_text_wrap( + [the 'time_t' type is currently forced to be 32-bit. + It will stop working after mid-January 2038. + Remove _USE_32BIT_TIME_T from the compiler flags.], + [], [], [55]))], + + [AC_MSG_ERROR( + [internal error: bad value for \$ac_cv_sys_year2038_opts])]) ]) -# Work around a problem in Autoconf through 2.71 on glibc 2.34+ -# with _TIME_BITS. Also, work around a problem in autoconf <= 2.69: -# AC_SYS_LARGEFILE does not configure for large inodes on Mac OS X 10.5, -# or configures them incorrectly in some cases. -m4_version_prereq([2.70], [], [ - -# _AC_SYS_LARGEFILE_TEST_INCLUDES -# ------------------------------- -m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES], -[#include <sys/types.h> - /* Check that off_t can represent 2**63 - 1 correctly. - We can't simply define LARGE_OFF_T to be 9223372036854775807, +# _AC_SYS_YEAR2038_ENABLE +# ----------------------- +# Depending on which of the YEAR2038 macros was used, add either an +# --enable-year2038 or a --disable-year2038 to +# the configure script. This is expanded very late and +# therefore there cannot be any code in the AC_ARG_ENABLE. The +# default value for 'enable_year2038' is emitted unconditionally +# because the generated code always looks at this variable. +m4_define([_AC_SYS_YEAR2038_ENABLE], +[m4_divert_text([DEFAULTS], + m4_provide_if([AC_SYS_YEAR2038], + [enable_year2038=yes], + [enable_year2038=no]))]dnl +[AC_ARG_ENABLE([year2038], + m4_provide_if([AC_SYS_YEAR2038], + [AS_HELP_STRING([--disable-year2038], + [don't support timestamps after 2038])], + [AS_HELP_STRING([--enable-year2038], + [support timestamps after 2038])]))]) + +# AC_SYS_YEAR2038 +# --------------- +# Attempt to detect and activate support for large time_t. +# On systems where time_t is not always 64 bits, this probe can be +# skipped by passing the --disable-year2038 option to configure. +AC_DEFUN([AC_SYS_YEAR2038], +[AC_REQUIRE([AC_SYS_LARGEFILE])dnl +AS_IF([test "$enable_year2038,$ac_have_year2038,$cross_compiling" = yes,no,no], + [# If we're not cross compiling and 'touch' works with a large + # timestamp, then we can presume the system supports wider time_t + # *somehow* and we just weren't able to detect it. One common + # case that we deliberately *don't* probe for is a system that + # supports both 32- and 64-bit ABIs but only the 64-bit ABI offers + # wide time_t. (It would be inappropriate for us to override an + # intentional use of -m32.) Error out, demanding use of + # --disable-year2038 if this is intentional. + AS_IF([TZ=UTC0 touch -t 210602070628.15 conftest.time 2>/dev/null], + [AS_CASE([`TZ=UTC0 LC_ALL=C ls -l conftest.time 2>/dev/null`], + [*'Feb 7 2106'* | *'Feb 7 17:10'*], + [AC_MSG_FAILURE(m4_text_wrap( + [this system appears to support timestamps after mid-January 2038, + but no mechanism for enabling wide 'time_t' was detected. + Did you mean to build a 64-bit binary? (E.g., 'CC="${CC} -m64"'.) + To proceed with 32-bit time_t, configure with '--disable-year2038'.], + [], [], [55]))])])])]) + +# AC_SYS_YEAR2038_RECOMMENDED +# --------------------------- +# Same as AC_SYS_YEAR2038, but recommend support for large time_t. +# If we cannot find any way to make time_t capable of representing +# values larger than 2**31 - 1, error out unless --disable-year2038 is given. +AC_DEFUN([AC_SYS_YEAR2038_RECOMMENDED], +[AC_REQUIRE([AC_SYS_YEAR2038])dnl +AS_IF([test "$enable_year2038,$ac_have_year2038" = yes,no], + [AC_MSG_FAILURE(m4_text_wrap( + [could not enable timestamps after mid-January 2038. + This package recommends support for these later timestamps. + However, to proceed with signed 32-bit time_t even though it + will fail then, configure with '--disable-year2038'.], + [], [], [55]))])]) + +# _AC_SYS_LARGEFILE_TEST_CODE +# --------------------------- +# C code used to probe for large file support. +m4_define([_AC_SYS_LARGEFILE_TEST_CODE], +[@%:@include <sys/types.h> +@%:@ifndef FTYPE +@%:@ define FTYPE off_t +@%:@endif + /* Check that FTYPE can represent 2**63 - 1 correctly. + We can't simply define LARGE_FTYPE to be 9223372036854775807, since some C++ compilers masquerading as C compilers incorrectly reject 9223372036854775807. */ -#define LARGE_OFF_T (((off_t) 1 << 31 << 31) - 1 + ((off_t) 1 << 31 << 31)) - int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721 - && LARGE_OFF_T % 2147483647 == 1) - ? 1 : -1]];[]dnl +@%:@define LARGE_FTYPE (((FTYPE) 1 << 31 << 31) - 1 + ((FTYPE) 1 << 31 << 31)) + int FTYPE_is_large[[(LARGE_FTYPE % 2147483629 == 721 + && LARGE_FTYPE % 2147483647 == 1) + ? 1 : -1]];[]dnl ]) -])# m4_version_prereq 2.70 - -m4_ifndef([AC_SYS_YEAR2038], [ - -# _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, -# CACHE-VAR, -# DESCRIPTION, -# PROLOGUE, [FUNCTION-BODY]) -# -------------------------------------------------------- -m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE], -[AC_CACHE_CHECK([for $1 value needed for large files], [$3], -[while :; do - m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])( - [AC_LANG_PROGRAM([$5], [$6])], - [$3=no; break]) - m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])( - [AC_LANG_PROGRAM([#undef $1 -#define $1 $2 -$5], [$6])], - [$3=$2; break]) - $3=unknown - break -done]) -case $$3 in #( - no | unknown) ;; - *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);; -esac -rm -rf conftest*[]dnl -])# _AC_SYS_LARGEFILE_MACRO_VALUE +# Defined by Autoconf 2.71 and circa 2022 Gnulib unwisely depended on it. +m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES], [_AC_SYS_LARGEFILE_TEST_CODE]) + +# _AC_SYS_LARGEFILE_OPTIONS +# ------------------------- +# List of known ways to enable support for large files. If you change +# this list you probably also need to change the AS_CASE at the end of +# _AC_SYS_LARGEFILE_PROBE. +m4_define([_AC_SYS_LARGEFILE_OPTIONS], m4_normalize( + ["none needed"] dnl Most current systems + ["-D_FILE_OFFSET_BITS=64"] dnl X/Open LFS spec + ["-D_LARGE_FILES=1"] dnl 32-bit AIX 4.2.1+, 32-bit z/OS + ["-n32"] dnl 32-bit IRIX 6, SGI cc (obsolete) +)) + +# _AC_SYS_LARGEFILE_PROBE +# ----------------------- +# Subroutine of AC_SYS_LARGEFILE. Probe for large file support and set +# the cache variable ac_cv_sys_largefile_opts to one of the values in +# the _AC_SYS_LARGEFILE_OPTIONS list, or to "support not detected" if +# none of the options in that list worked. Then, set compilation +# options and #defines as necessary to enable large file support. +# +# If large file support is not detected, the behavior depends on which of +# the top-level AC_SYS_LARGEFILE macros was used (see below). +# +# If you change this macro you may also need to change +# _AC_SYS_LARGEFILE_OPTIONS. +AC_DEFUN([_AC_SYS_LARGEFILE_PROBE], +[AC_CACHE_CHECK([for $CC option to enable large file support], + [ac_cv_sys_largefile_opts], + [ac_save_CC="$CC" + ac_opt_found=no + for ac_opt in _AC_SYS_LARGEFILE_OPTIONS; do + AS_IF([test x"$ac_opt" != x"none needed"], + [CC="$ac_save_CC $ac_opt"]) + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_CODE])], + [AS_IF([test x"$ac_opt" = x"none needed"], + [# GNU/Linux s390x and alpha need _FILE_OFFSET_BITS=64 for wide ino_t. + CC="$CC -DFTYPE=ino_t" + AC_COMPILE_IFELSE([], [], + [CC="$CC -D_FILE_OFFSET_BITS=64" + AC_COMPILE_IFELSE([], [ac_opt='-D_FILE_OFFSET_BITS=64'])])]) + ac_cv_sys_largefile_opts=$ac_opt + ac_opt_found=yes]) + test $ac_opt_found = no || break + done + CC="$ac_save_CC" + dnl Gnulib implements large file support for native Windows, based on the + dnl variables WINDOWS_64_BIT_OFF_T, WINDOWS_64_BIT_ST_SIZE. + m4_ifdef([gl_LARGEFILE], [ + AC_REQUIRE([AC_CANONICAL_HOST]) + if test $ac_opt_found != yes; then + AS_CASE([$host_os], + [mingw* | windows*], + [ac_cv_sys_largefile_opts="supported through gnulib" + ac_opt_found=yes] + ) + fi + ]) + test $ac_opt_found = yes || ac_cv_sys_largefile_opts="support not detected"]) + +ac_have_largefile=yes +AS_CASE([$ac_cv_sys_largefile_opts], + ["none needed"], [], + ["supported through gnulib"], [], + ["support not detected"], + [ac_have_largefile=no], + + ["-D_FILE_OFFSET_BITS=64"], + [AC_DEFINE([_FILE_OFFSET_BITS], [64], + [Number of bits in a file offset, on hosts where this is settable.])], + + ["-D_LARGE_FILES=1"], + [AC_DEFINE([_LARGE_FILES], [1], + [Define to 1 on platforms where this makes off_t a 64-bit type.])], + + ["-n32"], + [CC="$CC -n32"], + + [AC_MSG_ERROR( + [internal error: bad value for \$ac_cv_sys_largefile_opts])]) +AS_IF([test "$enable_year2038" != no], + [_AC_SYS_YEAR2038_PROBE]) +AC_CONFIG_COMMANDS_PRE([_AC_SYS_YEAR2038_ENABLE])]) # AC_SYS_LARGEFILE # ---------------- @@ -85,44 +290,12 @@ rm -rf conftest*[]dnl # to have a 64-bit inode number cannot be accessed by 32-bit applications on # Linux x86/x86_64. This can occur with file systems such as XFS and NFS. AC_DEFUN([AC_SYS_LARGEFILE], -[AC_ARG_ENABLE(largefile, - [ --disable-largefile omit support for large files]) -AS_IF([test "$enable_largefile" != no], - [AC_CACHE_CHECK([for special C compiler options needed for large files], - ac_cv_sys_largefile_CC, - [ac_cv_sys_largefile_CC=no - if test "$GCC" != yes; then - ac_save_CC=$CC - while :; do - # IRIX 6.2 and later do not support large files by default, - # so use the C compiler's -n32 option if that helps. - AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])]) - AC_COMPILE_IFELSE([], [break]) - CC="$CC -n32" - AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break]) - break - done - CC=$ac_save_CC - rm -f conftest.$ac_ext - fi]) - if test "$ac_cv_sys_largefile_CC" != no; then - CC=$CC$ac_cv_sys_largefile_CC - fi - - _AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64, - ac_cv_sys_file_offset_bits, - [Number of bits in a file offset, on hosts where this is settable.], - [_AC_SYS_LARGEFILE_TEST_INCLUDES]) - AS_CASE([$ac_cv_sys_file_offset_bits], - [unknown], - [_AC_SYS_LARGEFILE_MACRO_VALUE([_LARGE_FILES], [1], - [ac_cv_sys_large_files], - [Define for large files, on AIX-style hosts.], - [_AC_SYS_LARGEFILE_TEST_INCLUDES])], - [64], - [gl_YEAR2038_BODY([])])]) -])# AC_SYS_LARGEFILE -])# m4_ifndef AC_SYS_YEAR2038 +[AC_ARG_ENABLE([largefile], + [AS_HELP_STRING([--disable-largefile], + [omit support for large files])])dnl +AS_IF([test "$enable_largefile,$enable_year2038" != no,no], + [_AC_SYS_LARGEFILE_PROBE])]) +])# m4_ifndef AC_SYS_YEAR2038_RECOMMENDED # Enable large files on systems where this is implemented by Gnulib, not by the # system headers. @@ -132,7 +305,7 @@ AC_DEFUN([gl_LARGEFILE], [ AC_REQUIRE([AC_CANONICAL_HOST]) case "$host_os" in - mingw*) + mingw* | windows*) dnl Native Windows. dnl mingw64 defines off_t to a 64-bit type already, if dnl _FILE_OFFSET_BITS=64, which is ensured by AC_SYS_LARGEFILE. |