m4/largefile.m4

   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.
  10 m4_version_prereq([2.69], [] ,[
  11
  12 # _AC_SYS_LARGEFILE_TEST_INCLUDES
  13 # -------------------------------
  14 m4_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 # --------------------------------------------------------
  32 m4_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
  44 done])
  45 case $$3 in #(
  46   no | unknown) ;;
  47   *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);;
  48 esac
  49 rm -rf conftest*[]dnl
  50 ])# _AC_SYS_LARGEFILE_MACRO_VALUE
  51
  52
  53 # AC_SYS_LARGEFILE
  54 # ----------------
  55 # By default, many hosts won't let programs access large files;
  56 # one must use special compiler options to get large-file access to work.
  57 # For more details about this brain damage please see:
  58 # http://www.unix-systems.org/version2/whatsnew/lfs20mar.html
  59 AC_DEFUN([AC_SYS_LARGEFILE],
  60 [AC_ARG_ENABLE(largefile,
  61                [  --disable-largefile     omit support for large files])
  62 if test "$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])
 101 fi
 102 ])# AC_SYS_LARGEFILE
 103
 104 ])# m4_version_prereq 2.69