dnl AC_VALIDATE_CACHE_SYSTEM_TYPE[(cmd)]
dnl if the cache file is inconsistent with the current host,
dnl target and build system types, execute CMD or print a default
dnl error message.
AC_DEFUN(AC_VALIDATE_CACHE_SYSTEM_TYPE, [
    AC_REQUIRE([AC_CANONICAL_SYSTEM])
    AC_MSG_CHECKING([config.cache system type])
    if { test x"${ac_cv_host_system_type+set}" = x"set" &&
         test x"$ac_cv_host_system_type" != x"$host"; } ||
       { test x"${ac_cv_build_system_type+set}" = x"set" &&
         test x"$ac_cv_build_system_type" != x"$build"; } ||
       { test x"${ac_cv_target_system_type+set}" = x"set" &&
         test x"$ac_cv_target_system_type" != x"$target"; }; then
	AC_MSG_RESULT([different])
	ifelse($#, 1, [$1],
		[AC_MSG_ERROR(["you must remove config.cache and restart configure"])])
    else
	AC_MSG_RESULT([same])
    fi
    ac_cv_host_system_type="$host"
    ac_cv_build_system_type="$build"
    ac_cv_target_system_type="$target"
])

#serial 12

dnl By default, many hosts won't let programs access large files;
dnl one must use special compiler options to get large-file access to work.
dnl For more details about this brain damage please see:
dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html

dnl Written by Paul Eggert <eggert@twinsun.com>.

dnl Internal subroutine of AC_SYS_LARGEFILE.
dnl AC_SYS_LARGEFILE_TEST_INCLUDES
AC_DEFUN(AC_SYS_LARGEFILE_TEST_INCLUDES,
  [[#include <sys/types.h>
    int a[(off_t) 9223372036854775807 == 9223372036854775807 ? 1 : -1];
  ]])

dnl Internal subroutine of AC_SYS_LARGEFILE.
dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR, COMMENT, INCLUDES, FUNCTION-BODY)
AC_DEFUN(AC_SYS_LARGEFILE_MACRO_VALUE,
  [AC_CACHE_CHECK([for $1 value needed for large files], $3,
     [$3=no
      AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES
$5
        ,
        [$6],
        ,
        [AC_TRY_COMPILE([#define $1 $2]
AC_SYS_LARGEFILE_TEST_INCLUDES
$5
           ,
           [$6],
           [$3=$2])])])
   if test "[$]$3" != no; then
     AC_DEFINE_UNQUOTED([$1], [$]$3, [$4])
   fi])

AC_DEFUN(AC_SYS_LARGEFILE,
  [AC_ARG_ENABLE(largefile,
     [  --disable-largefile     omit support for large files])
   if test "$enable_largefile" != no; then

     AC_CACHE_CHECK([for special C compiler options needed for large files],
       ac_cv_sys_largefile_CC,
       [ac_cv_sys_largefile_CC=no
        if test "$GCC" != yes; then
          # IRIX 6.2 and later do not support large files by default,
          # so use the C compiler's -n32 option if that helps.
          AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, , ,
            [ac_save_CC="$CC"
             CC="$CC -n32"
             AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, ,
               ac_cv_sys_largefile_CC=' -n32')
             CC="$ac_save_CC"])
        fi])
     if test "$ac_cv_sys_largefile_CC" != no; then
       CC="$CC$ac_cv_sys_largefile_CC"
     fi

     AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
       ac_cv_sys_file_offset_bits,
       [Number of bits in a file offset, on hosts where this is settable.])
     AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,
       ac_cv_sys_largefile_source,
       [Define to make ftello visible on some hosts (e.g. HP-UX 10.20).],
       [#include <stdio.h>], [return !ftello;])
     AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
       ac_cv_sys_large_files,
       [Define for large files, on AIX-style hosts.])
     AC_SYS_LARGEFILE_MACRO_VALUE(_XOPEN_SOURCE, 500,
       ac_cv_sys_xopen_source,
       [Define to make ftello visible on some hosts (e.g. glibc 2.1.3).],
       [#include <stdio.h>], [return !ftello;])
   fi
  ])