1 # Enable large files on systems where this is not the default.
3 # Copyright 1992-1996, 1998-2019 Free Software Foundation, Inc.
4 # This file is free software; the Free Software Foundation
5 # gives unlimited permission to copy and/or distribute it,
6 # with or without modifications, as long as this notice is preserved.
8 # The following macro works around a problem in Autoconf's AC_FUNC_FSEEKO:
9 # It does not set _LARGEFILE_SOURCE=1 on HP-UX/ia64 32-bit, although this
10 # setting of _LARGEFILE_SOURCE is needed so that <stdio.h> declares fseeko
11 # and ftello in C++ mode as well.
12 AC_DEFUN([gl_SET_LARGEFILE_SOURCE],
14 AC_REQUIRE([AC_CANONICAL_HOST])
18 AC_DEFINE([_LARGEFILE_SOURCE], [1],
19 [Define to 1 to make fseeko visible on some hosts (e.g. glibc 2.2).])
24 # The following implementation works around a problem in autoconf <= 2.69;
25 # AC_SYS_LARGEFILE does not configure for large inodes on Mac OS X 10.5,
26 # or configures them incorrectly in some cases.
27 m4_version_prereq([2.70], [] ,[
29 # _AC_SYS_LARGEFILE_TEST_INCLUDES
30 # -------------------------------
31 m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES],
32 [@%:@include <sys/types.h>
33 /* Check that off_t can represent 2**63 - 1 correctly.
34 We can't simply define LARGE_OFF_T to be 9223372036854775807,
35 since some C++ compilers masquerading as C compilers
36 incorrectly reject 9223372036854775807. */
37 @%:@define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
38 int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721
39 && LARGE_OFF_T % 2147483647 == 1)
44 # _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE,
47 # PROLOGUE, [FUNCTION-BODY])
48 # --------------------------------------------------------
49 m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE],
50 [AC_CACHE_CHECK([for $1 value needed for large files], [$3],
52 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
53 [AC_LANG_PROGRAM([$5], [$6])],
55 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
56 [AC_LANG_PROGRAM([@%:@define $1 $2
64 *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);;
67 ])# _AC_SYS_LARGEFILE_MACRO_VALUE
72 # By default, many hosts won't let programs access large files;
73 # one must use special compiler options to get large-file access to work.
74 # For more details about this brain damage please see:
75 # http://www.unix.org/version2/whatsnew/lfs20mar.html
76 AC_DEFUN([AC_SYS_LARGEFILE],
77 [AC_ARG_ENABLE(largefile,
78 [ --disable-largefile omit support for large files])
79 if test "$enable_largefile" != no; then
81 AC_CACHE_CHECK([for special C compiler options needed for large files],
82 ac_cv_sys_largefile_CC,
83 [ac_cv_sys_largefile_CC=no
84 if test "$GCC" != yes; then
87 # IRIX 6.2 and later do not support large files by default,
88 # so use the C compiler's -n32 option if that helps.
89 AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])])
90 AC_COMPILE_IFELSE([], [break])
92 AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break])
96 rm -f conftest.$ac_ext
98 if test "$ac_cv_sys_largefile_CC" != no; then
99 CC=$CC$ac_cv_sys_largefile_CC
102 _AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
103 ac_cv_sys_file_offset_bits,
104 [Number of bits in a file offset, on hosts where this is settable.],
105 [_AC_SYS_LARGEFILE_TEST_INCLUDES])
106 if test $ac_cv_sys_file_offset_bits = unknown; then
107 _AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
108 ac_cv_sys_large_files,
109 [Define for large files, on AIX-style hosts.],
110 [_AC_SYS_LARGEFILE_TEST_INCLUDES])
113 AC_DEFINE([_DARWIN_USE_64_BIT_INODE], [1],
114 [Enable large inode numbers on Mac OS X 10.5.])
117 ])# m4_version_prereq 2.70
119 # Enable large files on systems where this is implemented by Gnulib, not by the
121 # Set the variables WINDOWS_64_BIT_OFF_T, WINDOWS_64_BIT_ST_SIZE if Gnulib
122 # overrides ensure that off_t or 'struct size.st_size' are 64-bit, respectively.
123 AC_DEFUN([gl_LARGEFILE],
125 AC_REQUIRE([AC_CANONICAL_HOST])
129 dnl mingw64 defines off_t to a 64-bit type already, if
130 dnl _FILE_OFFSET_BITS=64, which is ensured by AC_SYS_LARGEFILE.
131 AC_CACHE_CHECK([for 64-bit off_t], [gl_cv_type_off_t_64],
134 [[#include <sys/types.h>
135 int verify_off_t_size[sizeof (off_t) >= 8 ? 1 : -1];
138 [gl_cv_type_off_t_64=yes], [gl_cv_type_off_t_64=no])
140 if test $gl_cv_type_off_t_64 = no; then
141 WINDOWS_64_BIT_OFF_T=1
143 WINDOWS_64_BIT_OFF_T=0
145 dnl Some mingw versions define, if _FILE_OFFSET_BITS=64, 'struct stat'
146 dnl to 'struct _stat32i64' or 'struct _stat64' (depending on
147 dnl _USE_32BIT_TIME_T), which has a 32-bit st_size member.
148 AC_CACHE_CHECK([for 64-bit st_size], [gl_cv_member_st_size_64],
151 [[#include <sys/types.h>
153 int verify_st_size_size[sizeof (buf.st_size) >= 8 ? 1 : -1];
156 [gl_cv_member_st_size_64=yes], [gl_cv_member_st_size_64=no])
158 if test $gl_cv_member_st_size_64 = no; then
159 WINDOWS_64_BIT_ST_SIZE=1
161 WINDOWS_64_BIT_ST_SIZE=0
165 dnl Nothing to do on gnulib's side.
166 dnl A 64-bit off_t is
167 dnl - already the default on Mac OS X, FreeBSD, NetBSD, OpenBSD, IRIX,
169 dnl - enabled by _FILE_OFFSET_BITS=64 (ensured by AC_SYS_LARGEFILE) on
170 dnl glibc, HP-UX, Solaris,
171 dnl - enabled by _LARGE_FILES=1 (ensured by AC_SYS_LARGEFILE) on AIX,
172 dnl - impossible to achieve on Minix 3.1.8.
173 WINDOWS_64_BIT_OFF_T=0
174 WINDOWS_64_BIT_ST_SIZE=0