1# Enable large files on systems where this is not the default. 2 3# Copyright 1992-1996, 1998-2014 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. 11m4_version_prereq([2.70], [] ,[ 12 13# _AC_SYS_LARGEFILE_TEST_INCLUDES 14# ------------------------------- 15m4_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# -------------------------------------------------------- 33m4_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 45done]) 46case $$3 in #( 47 no | unknown) ;; 48 *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);; 49esac 50rm -rf conftest*[]dnl 51])# _AC_SYS_LARGEFILE_MACRO_VALUE 52 53 54# AC_SYS_LARGEFILE 55# ---------------- 56# By default, many hosts won't let programs access large files; 57# one must use special compiler options to get large-file access to work. 58# For more details about this brain damage please see: 59# http://www.unix-systems.org/version2/whatsnew/lfs20mar.html 60AC_DEFUN([AC_SYS_LARGEFILE], 61[AC_ARG_ENABLE(largefile, 62 [ --disable-largefile omit support for large files]) 63if test "$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 $ac_cv_sys_file_offset_bits = unknown; then 91 _AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1, 92 ac_cv_sys_large_files, 93 [Define for large files, on AIX-style hosts.], 94 [_AC_SYS_LARGEFILE_TEST_INCLUDES]) 95 fi 96 97 AC_DEFINE([_DARWIN_USE_64_BIT_INODE], [1], 98 [Enable large inode numbers on Mac OS X 10.5.]) 99fi 100])# AC_SYS_LARGEFILE 101])# m4_version_prereq 2.70 102 103# Enable large files on systems where this is implemented by Gnulib, not by the 104# system headers. 105# Set the variables WINDOWS_64_BIT_OFF_T, WINDOWS_64_BIT_ST_SIZE if Gnulib 106# overrides ensure that off_t or 'struct size.st_size' are 64-bit, respectively. 107AC_DEFUN([gl_LARGEFILE], 108[ 109 AC_REQUIRE([AC_CANONICAL_HOST]) 110 case "$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]) 147