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annotate m4/largefile.m4 @ 17290:44c34bc536ac

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Fix typo in comment.
author Paul Eggert <eggert@cs.ucla.edu>
date Wed, 16 Jan 2013 09:38:28 -0800
parents e03debf767a4
children 344018b6e5d7
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1 # Enable large files on systems where this is not the default.
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2
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3 # Copyright 1992-1996, 1998-2013 Free Software Foundation, Inc.
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4 # This file is free software; the Free Software Foundation
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5 # gives unlimited permission to copy and/or distribute it,
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6 # with or without modifications, as long as this notice is preserved.
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7
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8 # The following implementation works around a problem in autoconf <= 2.69;
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9 # AC_SYS_LARGEFILE does not configure for large inodes on Mac OS X 10.5,
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10 # or configures them incorrectly in some cases.
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11 m4_version_prereq([2.70], [] ,[
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12
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13 # _AC_SYS_LARGEFILE_TEST_INCLUDES
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14 # -------------------------------
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15 m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES],
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16 [@%:@include <sys/types.h>
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17 /* Check that off_t can represent 2**63 - 1 correctly.
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18 We can't simply define LARGE_OFF_T to be 9223372036854775807,
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19 since some C++ compilers masquerading as C compilers
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20 incorrectly reject 9223372036854775807. */
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21 @%:@define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
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22 int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721
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23 && LARGE_OFF_T % 2147483647 == 1)
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24 ? 1 : -1]];[]dnl
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25 ])
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26
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27
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28 # _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE,
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29 # CACHE-VAR,
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30 # DESCRIPTION,
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31 # PROLOGUE, [FUNCTION-BODY])
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32 # --------------------------------------------------------
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33 m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE],
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34 [AC_CACHE_CHECK([for $1 value needed for large files], [$3],
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35 [while :; do
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36 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
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37 [AC_LANG_PROGRAM([$5], [$6])],
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38 [$3=no; break])
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39 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
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40 [AC_LANG_PROGRAM([@%:@define $1 $2
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41 $5], [$6])],
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42 [$3=$2; break])
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43 $3=unknown
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44 break
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45 done])
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46 case $$3 in #(
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47 no | unknown) ;;
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48 *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);;
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49 esac
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50 rm -rf conftest*[]dnl
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51 ])# _AC_SYS_LARGEFILE_MACRO_VALUE
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52
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53
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54 # AC_SYS_LARGEFILE
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55 # ----------------
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56 # By default, many hosts won't let programs access large files;
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57 # one must use special compiler options to get large-file access to work.
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58 # For more details about this brain damage please see:
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59 # http://www.unix-systems.org/version2/whatsnew/lfs20mar.html
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60 AC_DEFUN([AC_SYS_LARGEFILE],
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61 [AC_ARG_ENABLE(largefile,
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62 [ --disable-largefile omit support for large files])
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63 if test "$enable_largefile" != no; then
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64
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65 AC_CACHE_CHECK([for special C compiler options needed for large files],
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66 ac_cv_sys_largefile_CC,
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67 [ac_cv_sys_largefile_CC=no
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68 if test "$GCC" != yes; then
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69 ac_save_CC=$CC
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70 while :; do
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71 # IRIX 6.2 and later do not support large files by default,
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72 # so use the C compiler's -n32 option if that helps.
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73 AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])])
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74 AC_COMPILE_IFELSE([], [break])
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75 CC="$CC -n32"
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76 AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break])
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77 break
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78 done
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79 CC=$ac_save_CC
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80 rm -f conftest.$ac_ext
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81 fi])
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82 if test "$ac_cv_sys_largefile_CC" != no; then
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83 CC=$CC$ac_cv_sys_largefile_CC
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84 fi
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85
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86 _AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
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87 ac_cv_sys_file_offset_bits,
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88 [Number of bits in a file offset, on hosts where this is settable.],
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89 [_AC_SYS_LARGEFILE_TEST_INCLUDES])
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90 if test $ac_cv_sys_file_offset_bits = unknown; then
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91 _AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
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92 ac_cv_sys_large_files,
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93 [Define for large files, on AIX-style hosts.],
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94 [_AC_SYS_LARGEFILE_TEST_INCLUDES])
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95 fi
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96
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97 AC_DEFINE([_DARWIN_USE_64_BIT_INODE], [1],
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98 [Enable large inode numbers on Mac OS X 10.5.])
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99 fi
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100 ])# AC_SYS_LARGEFILE
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101 ])# m4_version_prereq 2.70
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102
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103 # Enable large files on systems where this is implemented by Gnulib, not by the
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104 # system headers.
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105 # Set the variables WINDOWS_64_BIT_OFF_T, WINDOWS_64_BIT_ST_SIZE if Gnulib
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106 # overrides ensure that off_t or 'struct size.st_size' are 64-bit, respectively.
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107 AC_DEFUN([gl_LARGEFILE],
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108 [
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109 AC_REQUIRE([AC_CANONICAL_HOST])
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110 case "$host_os" in
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111 mingw*)
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112 dnl Native Windows.
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113 dnl mingw64 defines off_t to a 64-bit type already, if
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114 dnl _FILE_OFFSET_BITS=64, which is ensured by AC_SYS_LARGEFILE.
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115 AC_CACHE_CHECK([for 64-bit off_t], [gl_cv_type_off_t_64],
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116 [AC_COMPILE_IFELSE(
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117 [AC_LANG_PROGRAM(
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118 [[#include <sys/types.h>
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119 int verify_off_t_size[sizeof (off_t) >= 8 ? 1 : -1];
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120 ]],
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121 [[]])],
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122 [gl_cv_type_off_t_64=yes], [gl_cv_type_off_t_64=no])
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123 ])
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124 if test $gl_cv_type_off_t_64 = no; then
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125 WINDOWS_64_BIT_OFF_T=1
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126 else
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127 WINDOWS_64_BIT_OFF_T=0
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128 fi
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129 dnl But all native Windows platforms (including mingw64) have a 32-bit
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130 dnl st_size member in 'struct stat'.
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131 WINDOWS_64_BIT_ST_SIZE=1
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132 ;;
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133 *)
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134 dnl Nothing to do on gnulib's side.
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135 dnl A 64-bit off_t is
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498a2211d839 Write "Mac OS X" instead of "MacOS X".
Bruno Haible <bruno@clisp.org>
parents: 16795
diff changeset
136 dnl - already the default on Mac OS X, FreeBSD, NetBSD, OpenBSD, IRIX,
16795
6a9ea5d7b466 Large File Support for native Windows platforms.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
137 dnl OSF/1, Cygwin,
6a9ea5d7b466 Large File Support for native Windows platforms.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
138 dnl - enabled by _FILE_OFFSET_BITS=64 (ensured by AC_SYS_LARGEFILE) on
6a9ea5d7b466 Large File Support for native Windows platforms.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
139 dnl glibc, HP-UX, Solaris,
6a9ea5d7b466 Large File Support for native Windows platforms.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
140 dnl - enabled by _LARGE_FILES=1 (ensured by AC_SYS_LARGEFILE) on AIX,
6a9ea5d7b466 Large File Support for native Windows platforms.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
141 dnl - impossible to achieve on Minix 3.1.8.
6a9ea5d7b466 Large File Support for native Windows platforms.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
142 WINDOWS_64_BIT_OFF_T=0
6a9ea5d7b466 Large File Support for native Windows platforms.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
143 WINDOWS_64_BIT_ST_SIZE=0
6a9ea5d7b466 Large File Support for native Windows platforms.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
144 ;;
6a9ea5d7b466 Large File Support for native Windows platforms.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
145 esac
6a9ea5d7b466 Large File Support for native Windows platforms.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
146 ])