1 # Enable large files on systems where this is not the default.
2 # Enable support for files on Linux file systems with 64-bit inode numbers.
4 # Copyright 1992-1996, 1998-2022 Free Software Foundation, Inc.
5 # This file is free software; the Free Software Foundation
6 # gives unlimited permission to copy and/or distribute it,
7 # with or without modifications, as long as this notice is preserved.
9 # The following macro works around a problem in Autoconf's AC_FUNC_FSEEKO:
10 # It does not set _LARGEFILE_SOURCE=1 on HP-UX/ia64 32-bit, although this
11 # setting of _LARGEFILE_SOURCE is needed so that <stdio.h> declares fseeko
12 # and ftello in C++ mode as well.
13 AC_DEFUN([gl_SET_LARGEFILE_SOURCE],
15 AC_REQUIRE([AC_CANONICAL_HOST])
19 AC_DEFINE([_LARGEFILE_SOURCE], [1],
20 [Define to 1 to make fseeko visible on some hosts (e.g. glibc 2.2).])
25 # Work around a problem in Autoconf through at least 2.71 on glibc 2.34+
26 # with _TIME_BITS. Also, work around a problem in autoconf <= 2.69:
27 # AC_SYS_LARGEFILE does not configure for large inodes on Mac OS X 10.5,
28 # or configures them incorrectly in some cases.
29 m4_version_prereq([2.70], [], [
31 # _AC_SYS_LARGEFILE_TEST_INCLUDES
32 # -------------------------------
33 m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES],
34 [#include <sys/types.h>
35 /* Check that off_t can represent 2**63 - 1 correctly.
36 We can't simply define LARGE_OFF_T to be 9223372036854775807,
37 since some C++ compilers masquerading as C compilers
38 incorrectly reject 9223372036854775807. */
39 #define LARGE_OFF_T (((off_t) 1 << 31 << 31) - 1 + ((off_t) 1 << 31 << 31))
40 int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721
41 && LARGE_OFF_T % 2147483647 == 1)
44 ])# m4_version_prereq 2.70
47 # _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE,
50 # PROLOGUE, [FUNCTION-BODY])
51 # --------------------------------------------------------
52 m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE],
53 [AC_CACHE_CHECK([for $1 value needed for large files], [$3],
55 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
56 [AC_LANG_PROGRAM([$5], [$6])],
58 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
59 [AC_LANG_PROGRAM([#undef $1
68 *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);;
71 ])# _AC_SYS_LARGEFILE_MACRO_VALUE
76 # By default, many hosts won't let programs access large files;
77 # one must use special compiler options to get large-file access to work.
78 # For more details about this brain damage please see:
79 # http://www.unix.org/version2/whatsnew/lfs20mar.html
80 # Additionally, on Linux file systems with 64-bit inodes a file that happens
81 # to have a 64-bit inode number cannot be accessed by 32-bit applications on
82 # Linux x86/x86_64. This can occur with file systems such as XFS and NFS.
83 AC_DEFUN([AC_SYS_LARGEFILE],
84 [AC_ARG_ENABLE(largefile,
85 [ --disable-largefile omit support for large files])
86 AS_IF([test "$enable_largefile" != no],
87 [AC_CACHE_CHECK([for special C compiler options needed for large files],
88 ac_cv_sys_largefile_CC,
89 [ac_cv_sys_largefile_CC=no
90 if test "$GCC" != yes; then
93 # IRIX 6.2 and later do not support large files by default,
94 # so use the C compiler's -n32 option if that helps.
95 AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])])
96 AC_COMPILE_IFELSE([], [break])
98 AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break])
102 rm -f conftest.$ac_ext
104 if test "$ac_cv_sys_largefile_CC" != no; then
105 CC=$CC$ac_cv_sys_largefile_CC
108 _AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
109 ac_cv_sys_file_offset_bits,
110 [Number of bits in a file offset, on hosts where this is settable.],
111 [_AC_SYS_LARGEFILE_TEST_INCLUDES])
112 AS_CASE([$ac_cv_sys_file_offset_bits],
114 [_AC_SYS_LARGEFILE_MACRO_VALUE([_LARGE_FILES], [1],
115 [ac_cv_sys_large_files],
116 [Define for large files, on AIX-style hosts.],
117 [_AC_SYS_LARGEFILE_TEST_INCLUDES])],
119 [gl_YEAR2038_BODY([])])])
122 # Enable large files on systems where this is implemented by Gnulib, not by the
124 # Set the variables WINDOWS_64_BIT_OFF_T, WINDOWS_64_BIT_ST_SIZE if Gnulib
125 # overrides ensure that off_t or 'struct size.st_size' are 64-bit, respectively.
126 AC_DEFUN([gl_LARGEFILE],
128 AC_REQUIRE([AC_CANONICAL_HOST])
132 dnl mingw64 defines off_t to a 64-bit type already, if
133 dnl _FILE_OFFSET_BITS=64, which is ensured by AC_SYS_LARGEFILE.
134 AC_CACHE_CHECK([for 64-bit off_t], [gl_cv_type_off_t_64],
137 [[#include <sys/types.h>
138 int verify_off_t_size[sizeof (off_t) >= 8 ? 1 : -1];
141 [gl_cv_type_off_t_64=yes], [gl_cv_type_off_t_64=no])
143 if test $gl_cv_type_off_t_64 = no; then
144 WINDOWS_64_BIT_OFF_T=1
146 WINDOWS_64_BIT_OFF_T=0
148 dnl Some mingw versions define, if _FILE_OFFSET_BITS=64, 'struct stat'
149 dnl to 'struct _stat32i64' or 'struct _stat64' (depending on
150 dnl _USE_32BIT_TIME_T), which has a 32-bit st_size member.
151 AC_CACHE_CHECK([for 64-bit st_size], [gl_cv_member_st_size_64],
154 [[#include <sys/types.h>
156 int verify_st_size_size[sizeof (buf.st_size) >= 8 ? 1 : -1];
159 [gl_cv_member_st_size_64=yes], [gl_cv_member_st_size_64=no])
161 if test $gl_cv_member_st_size_64 = no; then
162 WINDOWS_64_BIT_ST_SIZE=1
164 WINDOWS_64_BIT_ST_SIZE=0
168 dnl Nothing to do on gnulib's side.
169 dnl A 64-bit off_t is
170 dnl - already the default on Mac OS X, FreeBSD, NetBSD, OpenBSD, IRIX,
172 dnl - enabled by _FILE_OFFSET_BITS=64 (ensured by AC_SYS_LARGEFILE) on
173 dnl glibc, HP-UX, Solaris,
174 dnl - enabled by _LARGE_FILES=1 (ensured by AC_SYS_LARGEFILE) on AIX,
175 dnl - impossible to achieve on Minix 3.1.8.
176 WINDOWS_64_BIT_OFF_T=0
177 WINDOWS_64_BIT_ST_SIZE=0