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| 1 | +# =============================================================================== |
| 2 | +# https://www.gnu.org/software/autoconf-archive/ax_sys_largefile_sensitive.html |
| 3 | +# =============================================================================== |
| 4 | +# |
| 5 | +# SYNOPSIS |
| 6 | +# |
| 7 | +# AX_SYS_LARGEFILE_SENSITIVE |
| 8 | +# |
| 9 | +# DESCRIPTION |
| 10 | +# |
| 11 | +# Check whether the current system is sensitive to -Ddefines making off_t |
| 12 | +# having different types/sizes. Automatically define a config.h symbol |
| 13 | +# LARGEFILE_SENSITIVE if that is the case, otherwise leave everything as |
| 14 | +# is. |
| 15 | +# |
| 16 | +# This macro builds on top of AC_SYS_LARGEFILE to detect whether special |
| 17 | +# options are neede to make the code use 64bit off_t - in many setups this |
| 18 | +# will also make the code use 64bit off_t immediatly. |
| 19 | +# |
| 20 | +# The common use of a LARGEFILE_SENSITIVE config.h-define is to rename |
| 21 | +# exported functions, usually adding a 64 to the original function name. |
| 22 | +# Such renamings are only needed on systems being both (a) 32bit off_t by |
| 23 | +# default and (b) implementing large.file extensions (as for unix98). |
| 24 | +# |
| 25 | +# a renaming section could look like this: |
| 26 | +# |
| 27 | +# #if defined LARGEFILE_SENSITIVE && _FILE_OFFSET_BITS+0 == 64 |
| 28 | +# #define zzip_open zzip_open64 |
| 29 | +# #define zzip_seek zzip_seek64 |
| 30 | +# #endif |
| 31 | +# |
| 32 | +# for libraries, it is best to take advantage of the prefix-config.h |
| 33 | +# macro, otherwise you want to export a renamed LARGEFILE_SENSITIVE in an |
| 34 | +# installed header file. -> see AX_PREFIX_CONFIG_H |
| 35 | +# |
| 36 | +# LICENSE |
| 37 | +# |
| 38 | +# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> |
| 39 | +# |
| 40 | +# This program is free software; you can redistribute it and/or modify it |
| 41 | +# under the terms of the GNU General Public License as published by the |
| 42 | +# Free Software Foundation; either version 3 of the License, or (at your |
| 43 | +# option) any later version. |
| 44 | +# |
| 45 | +# This program is distributed in the hope that it will be useful, but |
| 46 | +# WITHOUT ANY WARRANTY; without even the implied warranty of |
| 47 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
| 48 | +# Public License for more details. |
| 49 | +# |
| 50 | +# You should have received a copy of the GNU General Public License along |
| 51 | +# with this program. If not, see <https://www.gnu.org/licenses/>. |
| 52 | +# |
| 53 | +# As a special exception, the respective Autoconf Macro's copyright owner |
| 54 | +# gives unlimited permission to copy, distribute and modify the configure |
| 55 | +# scripts that are the output of Autoconf when processing the Macro. You |
| 56 | +# need not follow the terms of the GNU General Public License when using |
| 57 | +# or distributing such scripts, even though portions of the text of the |
| 58 | +# Macro appear in them. The GNU General Public License (GPL) does govern |
| 59 | +# all other use of the material that constitutes the Autoconf Macro. |
| 60 | +# |
| 61 | +# This special exception to the GPL applies to versions of the Autoconf |
| 62 | +# Macro released by the Autoconf Archive. When you make and distribute a |
| 63 | +# modified version of the Autoconf Macro, you may extend this special |
| 64 | +# exception to the GPL to apply to your modified version as well. |
| 65 | + |
| 66 | +#serial 7 |
| 67 | + |
| 68 | +AU_ALIAS([AC_SYS_LARGEFILE_SENSITIVE], [AX_SYS_LARGEFILE_SENSITIVE]) |
| 69 | +AC_DEFUN([AX_SYS_LARGEFILE_SENSITIVE],[dnl |
| 70 | +AC_REQUIRE([AC_SYS_LARGEFILE])dnl |
| 71 | +# we know about some internals of ac_sys_largefile here... |
| 72 | +AC_MSG_CHECKING(whether system differentiates 64bit off_t by defines) |
| 73 | +ac_cv_sys_largefile_sensitive="no" |
| 74 | +if test ".${ac_cv_sys_file_offset_bits-no}${ac_cv_sys_large_files-no}" != ".nono" |
| 75 | +then ac_cv_sys_largefile_sensitive="yes" |
| 76 | + AC_DEFINE(LARGEFILE_SENSITIVE, 1, |
| 77 | + [whether the system defaults to 32bit off_t but can do 64bit when requested]) |
| 78 | +fi |
| 79 | +AC_MSG_RESULT([$ac_cv_sys_largefile_sensitive]) |
| 80 | +]) |
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