projects / urcu.git / blame
| Commit | Line | Data |
|---|---|---|
| a767fdc3 | 1 | # =========================================================================== |
| 8ca861a5 | 2 | # https://www.gnu.org/software/autoconf-archive/ax_tls.html |
| a767fdc3 MD |
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) | |
| 8ca861a5 MJ |
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. | |
| a767fdc3 MD |
15 | # |
| 16 | # LICENSE | |
| 17 | # | |
| 18 | # Copyright (c) 2008 Alan Woodland <ajw05@aber.ac.uk> | |
| 19 | # Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com> | |
| 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 | |
| 8ca861a5 | 32 | # with this program. If not, see <https://www.gnu.org/licenses/>. |
| a767fdc3 MD |
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 | ||
| 8ca861a5 | 47 | #serial 14 |
| a767fdc3 MD |
48 | |
| 49 | AC_DEFUN([AX_TLS], [ | |
| 8ca861a5 MJ |
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 | |
| a767fdc3 MD |
53 | AS_CASE([$ax_tls_keyword], |
| 54 | [none], [ac_cv_tls=none ; break], | |
| 8ca861a5 MJ |
55 | [AC_TRY_COMPILE( |
| 56 | [#include <stdlib.h> | |
| 57 | static void | |
| 58 | foo(void) { | |
| 59 | static ] $ax_tls_keyword [ int bar; | |
| 60 | exit(1); | |
| 61 | }], | |
| 62 | [], | |
| a767fdc3 | 63 | [ac_cv_tls=$ax_tls_keyword ; break], |
| 8ca861a5 | 64 | ac_cv_tls=none |
| a767fdc3 MD |
65 | )]) |
| 66 | done | |
| 67 | ]) | |
| 8ca861a5 | 68 | AC_MSG_RESULT([$ac_cv_tls]) |
| a767fdc3 MD |
69 | |
| 70 | AS_IF([test "$ac_cv_tls" != "none"], | |
| 8ca861a5 MJ |
71 | [AC_DEFINE_UNQUOTED([TLS],[$ac_cv_tls],[If the compiler supports a TLS storage class define it to that here]) |
| 72 | m4_ifnblank([$1],[$1])], | |
| 73 | [m4_ifnblank([$2],[$2])]) | |
| a767fdc3 | 74 | ]) |