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#serial 19
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>
/* Check that off_t can represent 2**63 - 1 correctly.
We can't simply "#define LARGE_OFF_T 9223372036854775807",
since some C++ compilers masquerading as C compilers
incorrectly reject 9223372036854775807. */
# define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
&& LARGE_OFF_T % 2147483647 == 1)
? 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([$5],
[$6],
,
[AC_TRY_COMPILE([#define $1 $2]
[$5]
,
[$6],
[$3=$2])])])
if test "[$]$3" != no; then
AC_DEFINE_UNQUOTED([$1], [$]$3, [$4])
fi])
AC_DEFUN(AC_SYS_LARGEFILE,
[AC_REQUIRE([AC_PROG_CC])
AC_ARG_ENABLE(largefile,
[ --disable-largefile omit support for large files])
if test "$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_TEST_INCLUDES)
AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
ac_cv_sys_large_files,
[Define for large files, on AIX-style hosts.],
AC_SYS_LARGEFILE_TEST_INCLUDES)
fi
])
AC_DEFUN(AC_FUNC_FSEEKO,
[AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,
ac_cv_sys_largefile_source,
[Define to make fseeko visible on some hosts (e.g. glibc 2.2).],
[#include <stdio.h>], [return !fseeko;])
# We used to try defining _XOPEN_SOURCE=500 too, to work around a bug
# in glibc 2.1.3, but that breaks too many other things.
# If you want fseeko and ftello with glibc, upgrade to a fixed glibc.
AC_CACHE_CHECK([for fseeko], ac_cv_func_fseeko,
[ac_cv_func_fseeko=no
AC_TRY_LINK([#include <stdio.h>],
[return fseeko && fseeko (stdin, 0, 0);],
[ac_cv_func_fseeko=yes])])
if test $ac_cv_func_fseeko != no; then
AC_DEFINE(HAVE_FSEEKO, 1,
[Define if fseeko (and presumably ftello) exists and is declared.])
fi])
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