377 lines
15 KiB
Plaintext
377 lines
15 KiB
Plaintext
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# Enable large files on systems where this is not the default.
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# Enable support for files on Linux file systems with 64-bit inode numbers.
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# Copyright 1992-1996, 1998-2023 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# The following macro works around a problem in Autoconf's AC_FUNC_FSEEKO:
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# It does not set _LARGEFILE_SOURCE=1 on HP-UX/ia64 32-bit, although this
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# setting of _LARGEFILE_SOURCE is needed so that <stdio.h> declares fseeko
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# and ftello in C++ mode as well.
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# Fixed in Autoconf 2.72, which has AC_SYS_YEAR2038.
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AC_DEFUN([gl_SET_LARGEFILE_SOURCE],
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m4_ifndef([AC_SYS_YEAR2038], [[
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_FUNC_FSEEKO
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case "$host_os" in
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hpux*)
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AC_DEFINE([_LARGEFILE_SOURCE], [1],
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[Define to 1 to make fseeko visible on some hosts (e.g. glibc 2.2).])
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;;
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esac
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]])
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)
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# Work around a problem in autoconf <= 2.69:
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# AC_SYS_LARGEFILE does not configure for large inodes on Mac OS X 10.5,
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# or configures them incorrectly in some cases.
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m4_version_prereq([2.70], [], [
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# _AC_SYS_LARGEFILE_TEST_INCLUDES
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# -------------------------------
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m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES],
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[#include <sys/types.h>
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/* Check that off_t can represent 2**63 - 1 correctly.
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We can't simply define LARGE_OFF_T to be 9223372036854775807,
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since some C++ compilers masquerading as C compilers
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incorrectly reject 9223372036854775807. */
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#define LARGE_OFF_T (((off_t) 1 << 31 << 31) - 1 + ((off_t) 1 << 31 << 31))
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int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721
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&& LARGE_OFF_T % 2147483647 == 1)
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? 1 : -1]];[]dnl
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])
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])# m4_version_prereq 2.70
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# Support AC_SYS_YEAR2038, even if Autoconf 2.71 or earlier.
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# This code is taken from Autoconf master.
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m4_ifndef([AC_SYS_YEAR2038], [
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# _AC_SYS_YEAR2038_TEST_CODE
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# --------------------------
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# C code used to probe for time_t that can represent time points more
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# than 2**31 - 1 seconds after the epoch. With the usual Unix epoch,
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# these correspond to dates after 2038-01-18 22:14:07 +0000 (Gregorian),
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# hence the name.
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AC_DEFUN([_AC_SYS_YEAR2038_TEST_CODE],
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[[
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#include <time.h>
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/* Check that time_t can represent 2**32 - 1 correctly. */
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#define LARGE_TIME_T \\
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((time_t) (((time_t) 1 << 30) - 1 + 3 * ((time_t) 1 << 30)))
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int verify_time_t_range[(LARGE_TIME_T / 65537 == 65535
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&& LARGE_TIME_T % 65537 == 0)
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? 1 : -1];
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]])
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# _AC_SYS_YEAR2038_OPTIONS
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# ------------------------
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# List of known ways to enable support for large time_t. If you change
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# this list you probably also need to change the AS_CASE at the end of
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# _AC_SYS_YEAR2038_PROBE.
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m4_define([_AC_SYS_YEAR2038_OPTIONS], m4_normalize(
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["none needed"] dnl 64-bit and newer 32-bit Unix
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["-D_TIME_BITS=64"] dnl glibc 2.34 with some 32-bit ABIs
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["-D__MINGW_USE_VC2005_COMPAT"] dnl 32-bit MinGW
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["-U_USE_32_BIT_TIME_T -D__MINGW_USE_VC2005_COMPAT"]
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dnl 32-bit MinGW (misconfiguration)
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))
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# _AC_SYS_YEAR2038_PROBE([IF-NOT-DETECTED])
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# -----------------------------------------
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# Subroutine of AC_SYS_YEAR2038. Probe for time_t that can represent
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# time points more than 2**31 - 1 seconds after the epoch (dates after
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# 2038-01-18, see above) and set the cache variable ac_cv_sys_year2038_opts
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# to one of the values in the _AC_SYS_YEAR2038_OPTIONS list, or to
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# "support not detected" if none of them worked. Then, set compilation
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# options and #defines as necessary to enable large time_t support.
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#
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# Note that we do not test whether mktime, localtime, etc. handle
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# large values of time_t correctly, as that would require use of
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# AC_TRY_RUN. Note also that some systems only support large time_t
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# together with large off_t.
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#
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# If support is not detected, the behavior depends on which of the
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# top-level AC_SYS_YEAR2038 macros was used (see below).
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#
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# If you change this macro you may also need to change
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# _AC_SYS_YEAR2038_OPTIONS.
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AC_DEFUN([_AC_SYS_YEAR2038_PROBE],
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[AC_CACHE_CHECK([for $CC option to enable timestamps after Jan 2038],
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[ac_cv_sys_year2038_opts],
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[ac_save_CPPFLAGS="$CPPFLAGS"
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ac_opt_found=no
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for ac_opt in _AC_SYS_YEAR2038_OPTIONS; do
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AS_IF([test x"$ac_opt" != x"none needed"],
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[CPPFLAGS="$ac_save_CPPFLAGS $ac_opt"])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([_AC_SYS_YEAR2038_TEST_CODE])],
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[ac_cv_sys_year2038_opts="$ac_opt"
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ac_opt_found=yes])
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test $ac_opt_found = no || break
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done
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CPPFLAGS="$ac_save_CPPFLAGS"
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test $ac_opt_found = yes || ac_cv_sys_year2038_opts="support not detected"])
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ac_have_year2038=yes
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AS_CASE([$ac_cv_sys_year2038_opts],
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["none needed"], [],
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["support not detected"],
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[ac_have_year2038=no
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AS_CASE([$enable_year2038],
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[yes],
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[# If we're not cross compiling and 'touch' works with a large
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# timestamp, then we can presume the system supports wider time_t
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# *somehow* and we just weren't able to detect it. One common
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# case that we deliberately *don't* probe for is a system that
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# supports both 32- and 64-bit ABIs but only the 64-bit ABI offers
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# wide time_t. (It would be inappropriate for us to override an
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# intentional use of -m32.) Error out, demanding use of
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# --disable-year2038 if this is intentional.
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AS_IF([test $cross_compiling = no],
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[AS_IF([TZ=UTC0 touch -t 210602070628.15 conftest.time 2>/dev/null],
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[AS_CASE([`TZ=UTC0 LC_ALL=C ls -l conftest.time 2>/dev/null`],
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[*'Feb 7 2106'* | *'Feb 7 17:10'*],
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[AC_MSG_FAILURE(m4_text_wrap(
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[this system appears to support timestamps after January 2038,
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but no mechanism for enabling wide 'time_t' was detected.
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Did you mean to build a 64-bit binary? (e.g. 'CC="${CC} -m64"'.)
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To proceed with 32-bit time_t, configure with '--disable-year2038'.],
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[], [], [55]))])])])])],
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["-D_TIME_BITS=64"],
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[AC_DEFINE([_TIME_BITS], [64],
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[Number of bits in time_t, on hosts where this is settable.])],
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["-D__MINGW_USE_VC2005_COMPAT=1"],
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[AC_DEFINE([__MINGW_USE_VC2005_COMPAT], [1],
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[Define to 1 on platforms where this makes time_t a 64-bit type.])],
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["-U_USE_32_BIT_TIME_T"*],
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[AC_MSG_FAILURE(m4_text_wrap(
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[the 'time_t' type is currently forced to be 32-bit.
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It will stop working after January 2038.
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Remove _USE_32BIT_TIME_T from the compiler flags.],
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[], [], [55]))],
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[AC_MSG_ERROR(
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[internal error: bad value for \$ac_cv_sys_year2038_opts])])
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])
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# _AC_SYS_YEAR2038_ENABLE
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# -----------------------
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# Subroutine of AC_SYS_YEAR2038 and _AC_SYS_YEAR2038_OPT_IN.
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# Depending on which of the YEAR2038 macros was used, add either an
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# --enable-year2038, or a --disable-year2038, or no option at all to
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# the configure script. Note that this is expanded very late and
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# therefore there cannot be any code in the AC_ARG_ENABLE. The
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# default value for enable_year2038 is emitted unconditionally
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# because the generated code always looks at this variable.
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m4_define([_AC_SYS_YEAR2038_ENABLE],
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[m4_divert_text([DEFAULTS],
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m4_provide_if([AC_SYS_YEAR2038],
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[enable_year2038=yes],
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[enable_year2038=no]))]dnl
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[AC_ARG_ENABLE([year2038],
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m4_provide_if([AC_SYS_YEAR2038],
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[AS_HELP_STRING([--disable-year2038],
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[do not support timestamps after 2038])],
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[AS_HELP_STRING([--enable-year2038],
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[support timestamps after 2038])]))])
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# _AC_SYS_YEAR2038_OPT_IN
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# -----------------------
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# If the --enable-year2038 option is given to configure, attempt to
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# detect and activate support for large time_t on 32-bit systems.
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# This macro is automatically invoked by AC_SYS_LARGEFILE when large
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# *file* support is detected. It does not AC_REQUIRE AC_SYS_LARGEFILE
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# to avoid a dependency loop, and is therefore unsafe to expose as a
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# documented macro.
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AC_DEFUN([_AC_SYS_YEAR2038_OPT_IN],
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[m4_provide_if([_AC_SYS_YEAR2038_PROBE], [], [dnl
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AS_IF([test "$enable_year2038" != no], [_AC_SYS_YEAR2038_PROBE])
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AC_CONFIG_COMMANDS_PRE([_AC_SYS_YEAR2038_ENABLE])
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])])
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# AC_SYS_YEAR2038
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# ---------------
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# Attempt to detect and activate support for large time_t.
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# On systems where time_t is not always 64 bits, this probe can be
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# skipped by passing the --disable-year2038 option to configure.
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AC_DEFUN([AC_SYS_YEAR2038],
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[AC_REQUIRE([AC_SYS_LARGEFILE])]dnl
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[m4_provide_if([_AC_SYS_YEAR2038_PROBE], [], [dnl
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AS_IF([test "$enable_year2038" != no], [_AC_SYS_YEAR2038_PROBE])
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AC_CONFIG_COMMANDS_PRE([_AC_SYS_YEAR2038_ENABLE])
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])])
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# _AC_SYS_LARGEFILE_TEST_CODE
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# ---------------------------
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# C code used to probe for large file support.
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m4_define([_AC_SYS_LARGEFILE_TEST_CODE],
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[@%:@include <sys/types.h>
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/* Check that off_t can represent 2**63 - 1 correctly.
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We can't simply define LARGE_OFF_T to be 9223372036854775807,
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since some C++ compilers masquerading as C compilers
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incorrectly reject 9223372036854775807. */
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@%:@define LARGE_OFF_T (((off_t) 1 << 31 << 31) - 1 + ((off_t) 1 << 31 << 31))
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int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721
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&& LARGE_OFF_T % 2147483647 == 1)
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? 1 : -1]];[]dnl
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])
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# _AC_SYS_LARGEFILE_OPTIONS
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# -------------------------
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# List of known ways to enable support for large files. If you change
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# this list you probably also need to change the AS_CASE at the end of
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# _AC_SYS_LARGEFILE_PROBE.
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m4_define([_AC_SYS_LARGEFILE_OPTIONS], m4_normalize(
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["none needed"] dnl Most current systems
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["-D_FILE_OFFSET_BITS=64"] dnl X/Open LFS spec
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["-D_LARGE_FILES=1"] dnl AIX (which versions?)
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["-n32"] dnl Irix 6.2 w/ SGI compiler
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))
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# _AC_SYS_LARGEFILE_PROBE
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# -----------------------
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# Subroutine of AC_SYS_LARGEFILE. Probe for large file support and set
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# the cache variable ac_cv_sys_largefile_opts to one of the values in
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# the _AC_SYS_LARGEFILE_OPTIONS list, or to "support not detected" if
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# none of the options in that list worked. Then, set compilation
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# options and #defines as necessary to enable large file support.
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#
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# If large file support is not detected, the behavior depends on which of
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# the top-level AC_SYS_LARGEFILE macros was used (see below).
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#
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# If you change this macro you may also need to change
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# _AC_SYS_LARGEFILE_OPTIONS.
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AC_DEFUN([_AC_SYS_LARGEFILE_PROBE],
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[AC_CACHE_CHECK([for $CC option to enable large file support],
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[ac_cv_sys_largefile_opts],
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[ac_save_CC="$CC"
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ac_opt_found=no
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for ac_opt in _AC_SYS_LARGEFILE_OPTIONS; do
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AS_IF([test x"$ac_opt" != x"none needed"],
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[CC="$ac_save_CC $ac_opt"])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_CODE])],
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[ac_cv_sys_largefile_opts="$ac_opt"
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ac_opt_found=yes])
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test $ac_opt_found = no || break
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done
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CC="$ac_save_CC"
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test $ac_opt_found = yes || ac_cv_sys_largefile_opts="support not detected"])
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ac_have_largefile=yes
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AS_CASE([$ac_cv_sys_largefile_opts],
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["none needed"], [],
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["support not detected"],
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[ac_have_largefile=no],
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["-D_FILE_OFFSET_BITS=64"],
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[AC_DEFINE([_FILE_OFFSET_BITS], [64],
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[Number of bits in a file offset, on hosts where this is settable.])],
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["-D_LARGE_FILES=1"],
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[AC_DEFINE([_LARGE_FILES], [1],
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[Define to 1 on platforms where this makes off_t a 64-bit type.])],
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["-n32"],
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[CC="$CC -n32"],
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[AC_MSG_ERROR(
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[internal error: bad value for \$ac_cv_sys_largefile_opts])])
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_AC_SYS_YEAR2038_OPT_IN
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])
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# _AC_SYS_LARGEFILE_ENABLE
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# ------------------------
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# Subroutine of AC_SYS_LARGEFILE. Note that this
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# is expanded very late and therefore there cannot be any code in the
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# AC_ARG_ENABLE. The default value for enable_largefile is emitted
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# unconditionally because the generated shell code always looks at
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# this variable.
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m4_define([_AC_SYS_LARGEFILE_ENABLE],
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[m4_divert_text([DEFAULTS],
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enable_largefile=yes)]dnl
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[AC_ARG_ENABLE([largefile],
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[AS_HELP_STRING([--disable-largefile], [omit support for large files])])])
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|
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# AC_SYS_LARGEFILE
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# ----------------
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# By default, many hosts won't let programs access large files;
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# one must use special compiler options to get large-file access to work.
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# For more details about this brain damage please see:
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# http://www.unix.org/version2/whatsnew/lfs20mar.html
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# Additionally, on Linux file systems with 64-bit inodes a file that happens
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# to have a 64-bit inode number cannot be accessed by 32-bit applications on
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# Linux x86/x86_64. This can occur with file systems such as XFS and NFS.
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# This macro allows configuration to continue if the system doesn't support
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# large files.
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AC_DEFUN([AC_SYS_LARGEFILE],
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[m4_provide_if([_AC_SYS_LARGEFILE_PROBE], [], [dnl
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AS_IF([test "$enable_largefile" != no], [_AC_SYS_LARGEFILE_PROBE])
|
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AC_CONFIG_COMMANDS_PRE([_AC_SYS_LARGEFILE_ENABLE])
|
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])])
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])# m4_ifndef AC_SYS_YEAR2038
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# Enable large files on systems where this is implemented by Gnulib, not by the
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# system headers.
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# Set the variables WINDOWS_64_BIT_OFF_T, WINDOWS_64_BIT_ST_SIZE if Gnulib
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# overrides ensure that off_t or 'struct size.st_size' are 64-bit, respectively.
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AC_DEFUN([gl_LARGEFILE],
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[
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AC_REQUIRE([AC_CANONICAL_HOST])
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case "$host_os" in
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mingw*)
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dnl Native Windows.
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dnl mingw64 defines off_t to a 64-bit type already, if
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dnl _FILE_OFFSET_BITS=64, which is ensured by AC_SYS_LARGEFILE.
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AC_CACHE_CHECK([for 64-bit off_t], [gl_cv_type_off_t_64],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <sys/types.h>
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int verify_off_t_size[sizeof (off_t) >= 8 ? 1 : -1];
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]],
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[[]])],
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[gl_cv_type_off_t_64=yes], [gl_cv_type_off_t_64=no])
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])
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|
if test $gl_cv_type_off_t_64 = no; then
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WINDOWS_64_BIT_OFF_T=1
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else
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WINDOWS_64_BIT_OFF_T=0
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fi
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dnl Some mingw versions define, if _FILE_OFFSET_BITS=64, 'struct stat'
|
||
|
dnl to 'struct _stat32i64' or 'struct _stat64' (depending on
|
||
|
dnl _USE_32BIT_TIME_T), which has a 32-bit st_size member.
|
||
|
AC_CACHE_CHECK([for 64-bit st_size], [gl_cv_member_st_size_64],
|
||
|
[AC_COMPILE_IFELSE(
|
||
|
[AC_LANG_PROGRAM(
|
||
|
[[#include <sys/types.h>
|
||
|
struct stat buf;
|
||
|
int verify_st_size_size[sizeof (buf.st_size) >= 8 ? 1 : -1];
|
||
|
]],
|
||
|
[[]])],
|
||
|
[gl_cv_member_st_size_64=yes], [gl_cv_member_st_size_64=no])
|
||
|
])
|
||
|
if test $gl_cv_member_st_size_64 = no; then
|
||
|
WINDOWS_64_BIT_ST_SIZE=1
|
||
|
else
|
||
|
WINDOWS_64_BIT_ST_SIZE=0
|
||
|
fi
|
||
|
;;
|
||
|
*)
|
||
|
dnl Nothing to do on gnulib's side.
|
||
|
dnl A 64-bit off_t is
|
||
|
dnl - already the default on Mac OS X, FreeBSD, NetBSD, OpenBSD, IRIX,
|
||
|
dnl OSF/1, Cygwin,
|
||
|
dnl - enabled by _FILE_OFFSET_BITS=64 (ensured by AC_SYS_LARGEFILE) on
|
||
|
dnl glibc, HP-UX, Solaris,
|
||
|
dnl - enabled by _LARGE_FILES=1 (ensured by AC_SYS_LARGEFILE) on AIX,
|
||
|
dnl - impossible to achieve on Minix 3.1.8.
|
||
|
WINDOWS_64_BIT_OFF_T=0
|
||
|
WINDOWS_64_BIT_ST_SIZE=0
|
||
|
;;
|
||
|
esac
|
||
|
])
|