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1 office 1 # Enable large files on systems where this is not the default.
2  
3 # Copyright 1992-1996, 1998-2016 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.
7  
8 # The following implementation works around a problem in autoconf <= 2.69;
9 # AC_SYS_LARGEFILE does not configure for large inodes on Mac OS X 10.5,
10 # or configures them incorrectly in some cases.
11 m4_version_prereq([2.70], [] ,[
12  
13 # _AC_SYS_LARGEFILE_TEST_INCLUDES
14 # -------------------------------
15 m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES],
16 [@%:@include <sys/types.h>
17 /* Check that off_t can represent 2**63 - 1 correctly.
18 We can't simply define LARGE_OFF_T to be 9223372036854775807,
19 since some C++ compilers masquerading as C compilers
20 incorrectly reject 9223372036854775807. */
21 @%:@define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
22 int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721
23 && LARGE_OFF_T % 2147483647 == 1)
24 ? 1 : -1]];[]dnl
25 ])
26  
27  
28 # _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE,
29 # CACHE-VAR,
30 # DESCRIPTION,
31 # PROLOGUE, [FUNCTION-BODY])
32 # --------------------------------------------------------
33 m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE],
34 [AC_CACHE_CHECK([for $1 value needed for large files], [$3],
35 [while :; do
36 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
37 [AC_LANG_PROGRAM([$5], [$6])],
38 [$3=no; break])
39 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
40 [AC_LANG_PROGRAM([@%:@define $1 $2
41 $5], [$6])],
42 [$3=$2; break])
43 $3=unknown
44 break
45 done])
46 case $$3 in #(
47 no | unknown) ;;
48 *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);;
49 esac
50 rm -rf conftest*[]dnl
51 ])# _AC_SYS_LARGEFILE_MACRO_VALUE
52  
53  
54 # AC_SYS_LARGEFILE
55 # ----------------
56 # By default, many hosts won't let programs access large files;
57 # one must use special compiler options to get large-file access to work.
58 # For more details about this brain damage please see:
59 # http://www.unix-systems.org/version2/whatsnew/lfs20mar.html
60 AC_DEFUN([AC_SYS_LARGEFILE],
61 [AC_ARG_ENABLE(largefile,
62 [ --disable-largefile omit support for large files])
63 if test "$enable_largefile" != no; then
64  
65 AC_CACHE_CHECK([for special C compiler options needed for large files],
66 ac_cv_sys_largefile_CC,
67 [ac_cv_sys_largefile_CC=no
68 if test "$GCC" != yes; then
69 ac_save_CC=$CC
70 while :; do
71 # IRIX 6.2 and later do not support large files by default,
72 # so use the C compiler's -n32 option if that helps.
73 AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])])
74 AC_COMPILE_IFELSE([], [break])
75 CC="$CC -n32"
76 AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break])
77 break
78 done
79 CC=$ac_save_CC
80 rm -f conftest.$ac_ext
81 fi])
82 if test "$ac_cv_sys_largefile_CC" != no; then
83 CC=$CC$ac_cv_sys_largefile_CC
84 fi
85  
86 _AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
87 ac_cv_sys_file_offset_bits,
88 [Number of bits in a file offset, on hosts where this is settable.],
89 [_AC_SYS_LARGEFILE_TEST_INCLUDES])
90 if test $ac_cv_sys_file_offset_bits = unknown; then
91 _AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
92 ac_cv_sys_large_files,
93 [Define for large files, on AIX-style hosts.],
94 [_AC_SYS_LARGEFILE_TEST_INCLUDES])
95 fi
96  
97 AC_DEFINE([_DARWIN_USE_64_BIT_INODE], [1],
98 [Enable large inode numbers on Mac OS X 10.5.])
99 fi
100 ])# AC_SYS_LARGEFILE
101 ])# m4_version_prereq 2.70
102  
103 # Enable large files on systems where this is implemented by Gnulib, not by the
104 # system headers.
105 # Set the variables WINDOWS_64_BIT_OFF_T, WINDOWS_64_BIT_ST_SIZE if Gnulib
106 # overrides ensure that off_t or 'struct size.st_size' are 64-bit, respectively.
107 AC_DEFUN([gl_LARGEFILE],
108 [
109 AC_REQUIRE([AC_CANONICAL_HOST])
110 case "$host_os" in
111 mingw*)
112 dnl Native Windows.
113 dnl mingw64 defines off_t to a 64-bit type already, if
114 dnl _FILE_OFFSET_BITS=64, which is ensured by AC_SYS_LARGEFILE.
115 AC_CACHE_CHECK([for 64-bit off_t], [gl_cv_type_off_t_64],
116 [AC_COMPILE_IFELSE(
117 [AC_LANG_PROGRAM(
118 [[#include <sys/types.h>
119 int verify_off_t_size[sizeof (off_t) >= 8 ? 1 : -1];
120 ]],
121 [[]])],
122 [gl_cv_type_off_t_64=yes], [gl_cv_type_off_t_64=no])
123 ])
124 if test $gl_cv_type_off_t_64 = no; then
125 WINDOWS_64_BIT_OFF_T=1
126 else
127 WINDOWS_64_BIT_OFF_T=0
128 fi
129 dnl But all native Windows platforms (including mingw64) have a 32-bit
130 dnl st_size member in 'struct stat'.
131 WINDOWS_64_BIT_ST_SIZE=1
132 ;;
133 *)
134 dnl Nothing to do on gnulib's side.
135 dnl A 64-bit off_t is
136 dnl - already the default on Mac OS X, FreeBSD, NetBSD, OpenBSD, IRIX,
137 dnl OSF/1, Cygwin,
138 dnl - enabled by _FILE_OFFSET_BITS=64 (ensured by AC_SYS_LARGEFILE) on
139 dnl glibc, HP-UX, Solaris,
140 dnl - enabled by _LARGE_FILES=1 (ensured by AC_SYS_LARGEFILE) on AIX,
141 dnl - impossible to achieve on Minix 3.1.8.
142 WINDOWS_64_BIT_OFF_T=0
143 WINDOWS_64_BIT_ST_SIZE=0
144 ;;
145 esac
146 ])