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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 immediately.
#
# 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>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 11
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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