|
| 1 | +# =========================================================================== |
| 2 | +# https://www.gnu.org/software/autoconf-archive/ax_tls.html |
| 3 | +# =========================================================================== |
| 4 | +# |
| 5 | +# SYNOPSIS |
| 6 | +# |
| 7 | +# AX_TLS([action-if-found], [action-if-not-found]) |
| 8 | +# |
| 9 | +# DESCRIPTION |
| 10 | +# |
| 11 | +# Provides a test for the compiler support of thread local storage (TLS) |
| 12 | +# extensions. Defines TLS if it is found. Currently knows about C++11, |
| 13 | +# GCC/ICC, and MSVC. I think SunPro uses the same as GCC, and Borland |
| 14 | +# apparently supports either. |
| 15 | +# |
| 16 | +# LICENSE |
| 17 | +# |
| 18 | +# Copyright (c) 2008 Alan Woodland <[email protected]> |
| 19 | +# Copyright (c) 2010 Diego Elio Petteno` <[email protected]> |
| 20 | +# |
| 21 | +# This program is free software: you can redistribute it and/or modify it |
| 22 | +# under the terms of the GNU General Public License as published by the |
| 23 | +# Free Software Foundation, either version 3 of the License, or (at your |
| 24 | +# option) any later version. |
| 25 | +# |
| 26 | +# This program is distributed in the hope that it will be useful, but |
| 27 | +# WITHOUT ANY WARRANTY; without even the implied warranty of |
| 28 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
| 29 | +# Public License for more details. |
| 30 | +# |
| 31 | +# You should have received a copy of the GNU General Public License along |
| 32 | +# with this program. If not, see <https://www.gnu.org/licenses/>. |
| 33 | +# |
| 34 | +# As a special exception, the respective Autoconf Macro's copyright owner |
| 35 | +# gives unlimited permission to copy, distribute and modify the configure |
| 36 | +# scripts that are the output of Autoconf when processing the Macro. You |
| 37 | +# need not follow the terms of the GNU General Public License when using |
| 38 | +# or distributing such scripts, even though portions of the text of the |
| 39 | +# Macro appear in them. The GNU General Public License (GPL) does govern |
| 40 | +# all other use of the material that constitutes the Autoconf Macro. |
| 41 | +# |
| 42 | +# This special exception to the GPL applies to versions of the Autoconf |
| 43 | +# Macro released by the Autoconf Archive. When you make and distribute a |
| 44 | +# modified version of the Autoconf Macro, you may extend this special |
| 45 | +# exception to the GPL to apply to your modified version as well. |
| 46 | + |
| 47 | +#serial 15 |
| 48 | + |
| 49 | +AC_DEFUN([AX_TLS], [ |
| 50 | + AC_MSG_CHECKING([for thread local storage (TLS) class]) |
| 51 | + AC_CACHE_VAL([ac_cv_tls], |
| 52 | + [for ax_tls_keyword in thread_local _Thread_local __thread '__declspec(thread)' none; do |
| 53 | + AS_CASE([$ax_tls_keyword], |
| 54 | + [none], [ac_cv_tls=none ; break], |
| 55 | + [AC_COMPILE_IFELSE([AC_LANG_PROGRAM( |
| 56 | + [#include <stdlib.h>], |
| 57 | + [static $ax_tls_keyword int bar;] |
| 58 | + )], |
| 59 | + [ac_cv_tls=$ax_tls_keyword ; break], |
| 60 | + [ac_cv_tls=none] |
| 61 | + )] |
| 62 | + ) |
| 63 | + done ] |
| 64 | + ) |
| 65 | + AC_MSG_RESULT([$ac_cv_tls]) |
| 66 | +
|
| 67 | + AS_IF([test "$ac_cv_tls" != "none"], |
| 68 | + [AC_DEFINE_UNQUOTED([TLS],[$ac_cv_tls],[If the compiler supports a TLS storage class, define it to that here]) |
| 69 | + m4_ifnblank([$1],[$1],[[:]])], |
| 70 | + [m4_ifnblank([$2],[$2],[[:]])]) |
| 71 | +]) |
0 commit comments