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#serial 11
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_FLAGS(FLAGSNAME)
AC_DEFUN(AC_SYS_LARGEFILE_FLAGS,
[AC_CACHE_CHECK([for $1 value to request large file support],
ac_cv_sys_largefile_$1,
[if ($GETCONF LFS_$1) >conftest.1 2>conftest.2 && test ! -s conftest.2
then
ac_cv_sys_largefile_$1=`cat conftest.1`
else
ac_cv_sys_largefile_$1=no
ifelse($1, CFLAGS,
[case "$host_os" in
# HP-UX 10.20 requires -D__STDC_EXT__ with gcc 2.95.1.
[ hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)]
if test "$GCC" = yes; then
ac_cv_sys_largefile_CFLAGS=-D__STDC_EXT__
fi
;;
# IRIX 6.2 and later do not support large files by default,
# so use the -n32 ABI unless the installer said otherwise.
[ irix6.[2-9]* | irix6.1[0-9]* | irix[7-9].* | irix[1-9][0-9]*)]
if test "$GCC" != yes; then
case "$CC $CFLAGS " in
*' -o32 '*|*' -n32 '*|*' -64 '*) ;;
*) ac_cv_sys_largefile_CFLAGS=-n32 ;;
esac
fi
esac
if test "$ac_cv_sys_largefile_CFLAGS" != no; then
ac_save_CC="$CC"
CC="$CC $ac_cv_sys_largefile_CFLAGS"
AC_TRY_LINK(, , , ac_cv_sys_largefile_CFLAGS=no)
CC="$ac_save_CC"
fi])
fi
rm -f conftest*])])
dnl Internal subroutine of AC_SYS_LARGEFILE.
dnl AC_SYS_LARGEFILE_SPACE_APPEND(VAR, VAL)
AC_DEFUN(AC_SYS_LARGEFILE_SPACE_APPEND,
[case $2 in
no) ;;
?*)
case "[$]$1" in
'') $1=$2 ;;
*) $1=[$]$1' '$2 ;;
esac ;;
esac])
dnl Internal subroutine of AC_SYS_LARGEFILE.
dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, CACHE-VAR, COMMENT, CODE-TO-SET-DEFAULT)
AC_DEFUN(AC_SYS_LARGEFILE_MACRO_VALUE,
[AC_CACHE_CHECK([for $1], $2,
[$2=no
$4
for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
case "$ac_flag" in
-D$1)
$2=1 ;;
-D$1=*)
$2=`expr " $ac_flag" : '[[^=]]*=\(.*\)'` ;;
esac
done
])
if test "[$]$2" != no; then
AC_DEFINE_UNQUOTED([$1], [$]$2, [$3])
fi])
AC_DEFUN(AC_SYS_LARGEFILE,
[AC_REQUIRE([AC_CANONICAL_HOST])
AC_ARG_ENABLE(largefile,
[ --disable-largefile omit support for large files])
if test "$enable_largefile" != no; then
AC_CHECK_TOOL(GETCONF, getconf)
AC_SYS_LARGEFILE_FLAGS(CFLAGS)
AC_SYS_LARGEFILE_FLAGS(LDFLAGS)
AC_SYS_LARGEFILE_FLAGS(LIBS)
for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
case "$ac_flag" in
no) ;;
-D_FILE_OFFSET_BITS=*) ;;
-D_LARGEFILE_SOURCE | -D_LARGEFILE_SOURCE=*) ;;
-D_LARGE_FILES | -D_LARGE_FILES=*) ;;
-D?* | -I?*)
AC_SYS_LARGEFILE_SPACE_APPEND(CPPFLAGS, "$ac_flag") ;;
*)
AC_SYS_LARGEFILE_SPACE_APPEND(CFLAGS, "$ac_flag") ;;
esac
done
AC_SYS_LARGEFILE_SPACE_APPEND(LDFLAGS, "$ac_cv_sys_largefile_LDFLAGS")
AC_SYS_LARGEFILE_SPACE_APPEND(LIBS, "$ac_cv_sys_largefile_LIBS")
AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS,
ac_cv_sys_file_offset_bits,
[Number of bits in a file offset, on hosts where this is settable.],
[case "$host_os" in
# HP-UX 10.20 and later
[ hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)]
ac_cv_sys_file_offset_bits=64 ;;
esac])
AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE,
ac_cv_sys_largefile_source,
[Define to make ftello visible on some hosts (e.g. HP-UX 10.20).],
[AC_TRY_COMPILE([#include <stdio.h>], [return !ftello;], ,
[AC_TRY_COMPILE([#define _LARGEFILE_SOURCE 1
#include <stdio.h>], [return !ftello;],
ac_cv_sys_largefile_source=1)])])
AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES,
ac_cv_sys_large_files,
[Define for large files, on AIX-style hosts.],
[case "$host_os" in
# AIX 4.2 and later
[ aix4.[2-9]* | aix4.1[0-9]* | aix[5-9].* | aix[1-9][0-9]*)]
ac_cv_sys_large_files=1 ;;
esac])
AC_SYS_LARGEFILE_MACRO_VALUE(_XOPEN_SOURCE,
ac_cv_sys_xopen_source,
[Define to make ftello visible on some hosts (e.g. glibc 2.1.3).],
[AC_TRY_COMPILE([#include <stdio.h>], [return !ftello;], ,
[AC_TRY_COMPILE([#define _XOPEN_SOURCE 500
#include <stdio.h>],
[return !ftello;],
ac_cv_sys_xopen_source=500)])])
fi
])
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