Files
bind9/m4/ax_tls.m4
Ondřej Surý 58bd26b6cf Update the copyright information in all files in the repository
This commit converts the license handling to adhere to the REUSE
specification.  It specifically:

1. Adds used licnses to LICENSES/ directory

2. Add "isc" template for adding the copyright boilerplate

3. Changes all source files to include copyright and SPDX license
   header, this includes all the C sources, documentation, zone files,
   configuration files.  There are notes in the doc/dev/copyrights file
   on how to add correct headers to the new files.

4. Handle the rest that can't be modified via .reuse/dep5 file.  The
   binary (or otherwise unmodifiable) files could have license places
   next to them in <foo>.license file, but this would lead to cluttered
   repository and most of the files handled in the .reuse/dep5 file are
   system test files.
2022-01-11 09:05:02 +01:00

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# SPDX-License-Identifier: GPL-3.0-or-later WITH Autoconf-exception-3.0
#
# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_tls.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_TLS([action-if-found], [action-if-not-found])
#
# DESCRIPTION
#
# Provides a test for the compiler support of thread local storage (TLS)
# extensions. Defines TLS if it is found. Currently knows about C++11,
# GCC/ICC, and MSVC. I think SunPro uses the same as GCC, and Borland
# apparently supports either.
#
# LICENSE
#
# Copyright (c) 2008 Alan Woodland <ajw05@aber.ac.uk>
# Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com>
#
# 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 15
AC_DEFUN([AX_TLS], [
AC_MSG_CHECKING([for thread local storage (TLS) class])
AC_CACHE_VAL([ac_cv_tls],
[for ax_tls_keyword in thread_local _Thread_local __thread '__declspec(thread)' none; do
AS_CASE([$ax_tls_keyword],
[none], [ac_cv_tls=none ; break],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[#include <stdlib.h>],
[static $ax_tls_keyword int bar;]
)],
[ac_cv_tls=$ax_tls_keyword ; break],
[ac_cv_tls=none]
)]
)
done ]
)
AC_MSG_RESULT([$ac_cv_tls])
AS_IF([test "$ac_cv_tls" != "none"],
[AC_DEFINE_UNQUOTED([TLS],[$ac_cv_tls],[If the compiler supports a TLS storage class, define it to that here])
m4_ifnblank([$1],[$1],[[:]])],
[m4_ifnblank([$2],[$2],[[:]])])
])