1# Enable large files on systems where this is not the default. 2 3# Copyright 1992-1996, 1998-2012 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 <= 2.68; 9# AC_SYS_LARGEFILE does not configure for large inodes on Mac OS X 10.5. 10m4_version_prereq([2.69], [] ,[ 11 12# _AC_SYS_LARGEFILE_TEST_INCLUDES 13# ------------------------------- 14m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES], 15[@%:@include <sys/types.h> 16 /* Check that off_t can represent 2**63 - 1 correctly. 17 We can't simply define LARGE_OFF_T to be 9223372036854775807, 18 since some C++ compilers masquerading as C compilers 19 incorrectly reject 9223372036854775807. */ 20@%:@define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62)) 21 int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721 22 && LARGE_OFF_T % 2147483647 == 1) 23 ? 1 : -1]];[]dnl 24]) 25 26 27# _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, 28# CACHE-VAR, 29# DESCRIPTION, 30# PROLOGUE, [FUNCTION-BODY]) 31# -------------------------------------------------------- 32m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE], 33[AC_CACHE_CHECK([for $1 value needed for large files], [$3], 34[while :; do 35 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])( 36 [AC_LANG_PROGRAM([$5], [$6])], 37 [$3=no; break]) 38 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])( 39 [AC_LANG_PROGRAM([@%:@define $1 $2 40$5], [$6])], 41 [$3=$2; break]) 42 $3=unknown 43 break 44done]) 45case $$3 in #( 46 no | unknown) ;; 47 *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);; 48esac 49rm -rf conftest*[]dnl 50])# _AC_SYS_LARGEFILE_MACRO_VALUE 51 52 53# AC_SYS_LARGEFILE 54# ---------------- 55# By default, many hosts won't let programs access large files; 56# one must use special compiler options to get large-file access to work. 57# For more details about this brain damage please see: 58# http://www.unix-systems.org/version2/whatsnew/lfs20mar.html 59AC_DEFUN([AC_SYS_LARGEFILE], 60[AC_ARG_ENABLE(largefile, 61 [ --disable-largefile omit support for large files]) 62if test "$enable_largefile" != no; then 63 64 AC_CACHE_CHECK([for special C compiler options needed for large files], 65 ac_cv_sys_largefile_CC, 66 [ac_cv_sys_largefile_CC=no 67 if test "$GCC" != yes; then 68 ac_save_CC=$CC 69 while :; do 70 # IRIX 6.2 and later do not support large files by default, 71 # so use the C compiler's -n32 option if that helps. 72 AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])]) 73 AC_COMPILE_IFELSE([], [break]) 74 CC="$CC -n32" 75 AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break]) 76 break 77 done 78 CC=$ac_save_CC 79 rm -f conftest.$ac_ext 80 fi]) 81 if test "$ac_cv_sys_largefile_CC" != no; then 82 CC=$CC$ac_cv_sys_largefile_CC 83 fi 84 85 _AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64, 86 ac_cv_sys_file_offset_bits, 87 [Number of bits in a file offset, on hosts where this is settable.], 88 [_AC_SYS_LARGEFILE_TEST_INCLUDES]) 89 if test $ac_cv_sys_file_offset_bits = unknown; then 90 _AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1, 91 ac_cv_sys_large_files, 92 [Define for large files, on AIX-style hosts.], 93 [_AC_SYS_LARGEFILE_TEST_INCLUDES]) 94 fi 95 96 AH_VERBATIM([_DARWIN_USE_64_BIT_INODE], 97[/* Enable large inode numbers on Mac OS X. */ 98#ifndef _DARWIN_USE_64_BIT_INODE 99# define _DARWIN_USE_64_BIT_INODE 1 100#endif]) 101fi 102])# AC_SYS_LARGEFILE 103 104])# m4_version_prereq 2.69 105 106# Enable large files on systems where this is implemented by Gnulib, not by the 107# system headers. 108# Set the variables WINDOWS_64_BIT_OFF_T, WINDOWS_64_BIT_ST_SIZE if Gnulib 109# overrides ensure that off_t or 'struct size.st_size' are 64-bit, respectively. 110AC_DEFUN([gl_LARGEFILE], 111[ 112 AC_REQUIRE([AC_CANONICAL_HOST]) 113 case "$host_os" in 114 mingw*) 115 dnl Native Windows. 116 dnl mingw64 defines off_t to a 64-bit type already, if 117 dnl _FILE_OFFSET_BITS=64, which is ensured by AC_SYS_LARGEFILE. 118 AC_CACHE_CHECK([for 64-bit off_t], [gl_cv_type_off_t_64], 119 [AC_COMPILE_IFELSE( 120 [AC_LANG_PROGRAM( 121 [[#include <sys/types.h> 122 int verify_off_t_size[sizeof (off_t) >= 8 ? 1 : -1]; 123 ]], 124 [[]])], 125 [gl_cv_type_off_t_64=yes], [gl_cv_type_off_t_64=no]) 126 ]) 127 if test $gl_cv_type_off_t_64 = no; then 128 WINDOWS_64_BIT_OFF_T=1 129 else 130 WINDOWS_64_BIT_OFF_T=0 131 fi 132 dnl But all native Windows platforms (including mingw64) have a 32-bit 133 dnl st_size member in 'struct stat'. 134 WINDOWS_64_BIT_ST_SIZE=1 135 ;; 136 *) 137 dnl Nothing to do on gnulib's side. 138 dnl A 64-bit off_t is 139 dnl - already the default on Mac OS X, FreeBSD, NetBSD, OpenBSD, IRIX, 140 dnl OSF/1, Cygwin, 141 dnl - enabled by _FILE_OFFSET_BITS=64 (ensured by AC_SYS_LARGEFILE) on 142 dnl glibc, HP-UX, Solaris, 143 dnl - enabled by _LARGE_FILES=1 (ensured by AC_SYS_LARGEFILE) on AIX, 144 dnl - impossible to achieve on Minix 3.1.8. 145 WINDOWS_64_BIT_OFF_T=0 146 WINDOWS_64_BIT_ST_SIZE=0 147 ;; 148 esac 149]) 150