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# ===============================================================================
# https://www.gnu.org/software/autoconf-archive/ax_sys_largefile_sensitive.html
# ===============================================================================
#
# SYNOPSIS
#
# AX_SYS_LARGEFILE_SENSITIVE
#
# DESCRIPTION
#
# Check whether the current system is sensitive to -Ddefines making off_t
# having different types/sizes. Automatically define a config.h symbol
# LARGEFILE_SENSITIVE if that is the case, otherwise leave everything as
# is.
#
# This macro builds on top of AC_SYS_LARGEFILE to detect whether special
# options are needed to make the code use 64bit off_t - in many setups
# this will also make the code use 64bit off_t immediatly.
#
# The common use of a LARGEFILE_SENSITIVE config.h-define is to rename
# exported functions, usually adding a 64 to the original function name.
# Such renamings are only needed on systems being both (a) 32bit off_t by
# default and (b) implementing large.file extensions (as for unix98).
#
# a renaming section could look like this:
#
# #if defined LARGEFILE_SENSITIVE && _FILE_OFFSET_BITS+0 == 64
# #define zzip_open zzip_open64
# #define zzip_seek zzip_seek64
# #endif
#
# for libraries, it is best to take advantage of the prefix-config.h
# macro, otherwise you want to export a renamed LARGEFILE_SENSITIVE in an
# installed header file. -> see AX_PREFIX_CONFIG_H
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 3 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <https://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 9
AU_ALIAS([AC_SYS_LARGEFILE_SENSITIVE], [AX_SYS_LARGEFILE_SENSITIVE])
AC_DEFUN([AX_SYS_LARGEFILE_SENSITIVE],[dnl
AC_REQUIRE([AC_SYS_LARGEFILE])dnl
# we know about some internals of ac_sys_largefile here...
AC_MSG_CHECKING(whether system differentiates 64bit off_t by defines)
ac_cv_sys_largefile_sensitive="no"
if test ".${ac_cv_sys_file_offset_bits-no}${ac_cv_sys_large_files-no}" != ".nono"
then ac_cv_sys_largefile_sensitive="yes"
AC_DEFINE(LARGEFILE_SENSITIVE, 1,
[whether the system defaults to 32bit off_t but can do 64bit when requested])
fi
AC_MSG_RESULT([$ac_cv_sys_largefile_sensitive])
])
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